Materials Chemistry and Physics最新文献_第4页

Investigating superplastic deformation mechanisms in HC1000/1470DP advanced high-strength steel through high-temperature tensile and bulge forming tests 通过高温拉伸和胀形试验研究HC1000/1470DP高级高强钢的超塑性变形机理

IF 4.7 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2026-04-15 Epub Date: 2026-02-10 DOI: 10.1016/j.matchemphys.2026.132213

Tianmin Li , Jiahui Wang , Xiaoting Xu , Qingbo Yang , Chunxu Wang , Liqiang Zhan , Tongxu Zhou , Daili Yang , Kaijia Zhang , Guofeng Wang

This paper systematically investigates the superplastic deformation behavior and mechanisms of HC1000/1470DP dual-phase high-strength steel. Through high-temperature tensile tests and gas pressure bulge forming experiments, combined with microstructural analyses such as electron backscatter diffraction (EBSD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM), its deformation performance and microstructural evolution under conditions of 700–775 °C and 0.0001-0.01 s⁻¹ were comprehensively evaluated. The results show that the maximum elongation of 345% was achieved at 750 °C and 0.0033s⁻¹, with a strain rate sensitivity index (m-value) of 0.32 and a deformation activation energy of approximately 152.6 kJ/mol, where the characteristic parameters are consistent with grain boundary sliding. Based on the dynamic material model, a thermal processing map was constructed and process parameters were optimized. Box-shaped bulge parts with depths of 20 mm and 30 mm were successfully fabricated at 750 °C and 3.3 × 10⁻³ s⁻¹.After bulging, significant dynamic recrystallization occurred at the bottom, accompanied by a decrease in martensite content and dislocation density, leading to a reduction in mechanical properties, with the thinning rate of the 30 mm part reaching nearly 80%. This study clarifies the grain boundary sliding -dominated superplastic deformation mechanism of this steel, providing a basis for its hot forming applications in lightweight automotive components.

系统地研究了HC1000/1470DP双相高强钢的超塑性变形行为及其机理。通过高温拉伸试验和气体压力胀形实验，结合电子背散射衍射（EBSD）、扫描电镜（SEM）和透射电镜（TEM）等显微组织分析，综合评价了其在700 ~ 775℃、0.0001 ~ 0.01 s−1条件下的变形性能和显微组织演变。结果表明：在750℃和0.0033s−1条件下，合金的最大伸长率为345%，应变率敏感指数（m值）为0.32，变形激活能约为152.6 kJ/mol，其特征参数与晶界滑动一致；基于材料动态模型，构建了热加工图，并对工艺参数进行了优化。在750°C和3.3 × 10−3 s−1的温度下成功制备了深度为20 mm和30 mm的箱形凸件。胀形后，底部发生明显的动态再结晶，马氏体含量和位错密度下降，导致力学性能下降，其中30 mm部位的减薄率接近80%。本研究阐明了该钢晶界滑动主导的超塑性变形机理，为其在轻量化汽车零部件的热成形应用提供了依据。

{"title":"Investigating superplastic deformation mechanisms in HC1000/1470DP advanced high-strength steel through high-temperature tensile and bulge forming tests","authors":"Tianmin Li , Jiahui Wang , Xiaoting Xu , Qingbo Yang , Chunxu Wang , Liqiang Zhan , Tongxu Zhou , Daili Yang , Kaijia Zhang , Guofeng Wang","doi":"10.1016/j.matchemphys.2026.132213","DOIUrl":"10.1016/j.matchemphys.2026.132213","url":null,"abstract":"<div><div>This paper systematically investigates the superplastic deformation behavior and mechanisms of HC1000/1470DP dual-phase high-strength steel. Through high-temperature tensile tests and gas pressure bulge forming experiments, combined with microstructural analyses such as electron backscatter diffraction (EBSD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM), its deformation performance and microstructural evolution under conditions of 700–775 °C and 0.0001-0.01 s<sup>−1</sup> were comprehensively evaluated. The results show that the maximum elongation of 345% was achieved at 750 °C and 0.0033s<sup>−1</sup>, with a strain rate sensitivity index (m-value) of 0.32 and a deformation activation energy of approximately 152.6 kJ/mol, where the characteristic parameters are consistent with grain boundary sliding. Based on the dynamic material model, a thermal processing map was constructed and process parameters were optimized. Box-shaped bulge parts with depths of 20 mm and 30 mm were successfully fabricated at 750 °C and 3.3 × 10<sup>−3</sup> s<sup>−1</sup>.After bulging, significant dynamic recrystallization occurred at the bottom, accompanied by a decrease in martensite content and dislocation density, leading to a reduction in mechanical properties, with the thinning rate of the 30 mm part reaching nearly 80%. This study clarifies the grain boundary sliding -dominated superplastic deformation mechanism of this steel, providing a basis for its hot forming applications in lightweight automotive components.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"354 ","pages":"Article 132213"},"PeriodicalIF":4.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146191628","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Magnetism of Fe- and/or Co-enriched layer/TiO2/Ti composites Fe-和/或co -富集层/TiO2/Ti复合材料的磁性

IF 4.7 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2026-04-15 Epub Date: 2026-02-06 DOI: 10.1016/j.matchemphys.2026.132201

M.V. Adigamova, I.V. Lukiyanchuk, V.P. Morozova, I.A. Tkachenko, K.A. Saiankina, I.V. Malyshev

Ti-supported surface structures with magnetic properties were prepared at constant current density of 0.15 A/cm² for 10 min using plasma electrolytic oxidation (PEO) in slurry electrolytes with solid particles of Fe(OH)₃ and Co(OH)₂ formed in situ in different ratios at their constant total concentration. The general electrolyte formula (mol/L) can be written as 0.066 Na₃PO₄ + 0.034 Na₂B₄O₇ + 0.006 Na₂WO₄ + 0.08 (Fe(III) + Co(II)). The coatings were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), electron probe microanalysis (EPMA) and magnetometry based on superconducting quantum interference device (SQUID). With an increase in the proportion of Co(OH)₂ particles in the electrolyte, the coatings were formed at higher voltages, which caused an increase in their thickness (from 25 to 82 μm) and porosity (from 27 to 35%). As to EPMA/EDX data, the coatings contained up to 6.5/15.8 at% Fe and 6.5/12.5 at% Co, depending on the electrolyte formula. Open pores with particles and closed pores contained up to 25.3 at% Fe and up to 26.1 at% Co. At room temperature, with increasing Co proportion in the coatings, the values of coercive force and saturation magnetization increased from 72 to 292 Oe and from 0.05 to 0.048 emu/g, respectively. At 3 K, the coercive force value in mixed coatings was lower (94–160 Oe) than that in individual coatings containing only one magnetic element (230 Oe). No synergistic effect was observed in mixed Fe-, Co-containing coatings either at room temperature or at helium temperature.

采用等离子体电解氧化（PEO）技术，在恒电流密度为0.15 A/cm2的条件下，原位生成不同比例的Fe(OH)3和Co(OH)2固体颗粒，制备了具有磁性的钛载体表面结构。电解质的一般公式（mol/L）为0.066 Na3PO4 + 0.034 Na2B4O7 + 0.006 Na2WO4 + 0.08 (Fe（III) + Co(II)）。采用x射线衍射（XRD）、扫描电镜（SEM）、能量色散x射线能谱（EDX）、电子探针微分析（EPMA）和基于超导量子干涉器件（SQUID）的磁强计对涂层进行了表征。随着电解液中Co(OH)2颗粒比例的增加，涂层在更高的电压下形成，涂层的厚度从25 μm增加到82 μm，孔隙率从27%增加到35%。根据EPMA/EDX数据，根据电解质配方的不同，涂层在% Fe和% Co下的含量分别高达6.5/15.8和6.5/12.5。在室温下，随着Co含量的增加，涂层的矫顽力和饱和磁化强度分别从72 ~ 292 Oe和0.05 ~ 0.048 emu/g增加。在3k时，混合涂层的矫顽力值（94 ~ 160 Oe）低于仅含一种磁性元素的单独涂层（230 Oe）。在室温和氦温度下，混合含铁、含钴涂层均未观察到协同效应。

{"title":"Magnetism of Fe- and/or Co-enriched layer/TiO2/Ti composites","authors":"M.V. Adigamova, I.V. Lukiyanchuk, V.P. Morozova, I.A. Tkachenko, K.A. Saiankina, I.V. Malyshev","doi":"10.1016/j.matchemphys.2026.132201","DOIUrl":"10.1016/j.matchemphys.2026.132201","url":null,"abstract":"<div><div>Ti-supported surface structures with magnetic properties were prepared at constant current density of 0.15 A/cm<sup>2</sup> for 10 min using plasma electrolytic oxidation (PEO) in slurry electrolytes with solid particles of Fe(OH)<sub>3</sub> and Co(OH)<sub>2</sub> formed <em>in situ</em> in different ratios at their constant total concentration. The general electrolyte formula (mol/L) can be written as 0.066 Na<sub>3</sub>PO<sub>4</sub> + 0.034 Na<sub>2</sub>B<sub>4</sub>O<sub>7</sub> + 0.006 Na<sub>2</sub>WO<sub>4</sub> + 0.08 (Fe(III) + Co(II)). The coatings were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), electron probe microanalysis (EPMA) and magnetometry based on superconducting quantum interference device (SQUID). With an increase in the proportion of Co(OH)<sub>2</sub> particles in the electrolyte, the coatings were formed at higher voltages, which caused an increase in their thickness (from 25 to 82 μm) and porosity (from 27 to 35%). As to EPMA/EDX data, the coatings contained up to 6.5/15.8 at% Fe and 6.5/12.5 at% Co, depending on the electrolyte formula. Open pores with particles and closed pores contained up to 25.3 at% Fe and up to 26.1 at% Co. At room temperature, with increasing Co proportion in the coatings, the values of coercive force and saturation magnetization increased from 72 to 292 Oe and from 0.05 to 0.048 emu/g, respectively. At 3 K, the coercive force value in mixed coatings was lower (94–160 Oe) than that in individual coatings containing only one magnetic element (230 Oe). No synergistic effect was observed in mixed Fe-, Co-containing coatings either at room temperature or at helium temperature.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"354 ","pages":"Article 132201"},"PeriodicalIF":4.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146191919","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Role of hygroscopic nanofillers and plasticizer in enhancing ionic transport and structural stability of plasticized chitosan-based nanocomposite polymer electrolyte membranes for fuel cells 吸湿性纳米填料和增塑剂在增强增塑型壳聚糖基纳米复合聚合物燃料电池电解质膜离子传输和结构稳定性中的作用

IF 4.7 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2026-04-15 Epub Date: 2026-02-09 DOI: 10.1016/j.matchemphys.2026.132212

Qamber Ali , Taweesak Boonsod , Rojana Pornprasertsuk , Wanwisa Limphirat , Wirach Taweepreda , Kanoktip Boonkerd

The growing demand for high-performance, environmentally friendly, and cost-effective polymer electrolyte membranes (PEMs) has driven increasing interest in natural polymer-based materials. Chitosan (CS), a renewable and biodegradable biopolymer, offers a promising alternative to conventional synthetic PEMs but suffers from limited proton conductivity and stability. This work systematically investigated the incorporation of hygroscopic nanofiller (calcium oxide nanofiller, CaO–NF) and plasticizer (ethylene carbonate, EC) into a CS matrix and their effects on PEMs’ performance. Fourier-transform infrared (FTIR) analysis confirmed the formation of hydrogen-bonding interactions among the CS matrix, CaO–NF, and EC. Scanning electron microscopy coupled with energy dispersive spectroscopy (SEM-EDS) revealed a homogeneous dispersion of CaO–NF throughout the CS matrix. X-ray diffraction (XRD) analysis showed that the incorporation of CaO–NF and EC promoted the formation of amorphous region in the CS matrix, facilitating ion transport and resulting in a high ion-exchange capacity (IEC) of 3.5 meq.g⁻¹ and a proton conductivity of 166 mS cm⁻¹ for the CS/CaO₁/EC₁ membrane. Arrhenius analysis revealed a reduction in activation energy upon the incorporation of an optimized amount of nanofiller and plasticizer, confirming enhanced ion transport efficiency within the membrane matrix. The maximum chemical stability was achieved with the incorporation of 1 wt% CaO–NF, extending membrane durability to 86 h compared with 70 h for the pristine CS membrane; however, the stability decreased when EC was added to the CS/CaO₁ membrane. Based on comparisons with commercial PEMs reported in the literature, the CS/CaO₁/EC₁ membrane exhibited competitive proton conductivity together with excellent thermal stability, chemical stability, and mechanical properties, highlighting its potential for high-performance fuel cell applications.

随着对高性能、环保、高性价比聚合物电解质膜的需求不断增长，人们对天然聚合物基材料的兴趣日益浓厚。壳聚糖（CS）是一种可再生、可生物降解的生物聚合物，是传统合成PEMs的一种很有前途的替代品，但其质子导电性和稳定性有限。本文系统地研究了吸湿性纳米填充剂（氧化钙纳米填充剂，CaO-NF）和增塑剂（碳酸乙烯，EC）在CS基体中的掺入及其对PEMs性能的影响。傅里叶红外（FTIR）分析证实了CS基体、CaO-NF和EC之间形成了氢键相互作用。扫描电子显微镜和能量色散光谱（SEM-EDS）显示，CaO-NF在CS基体中均匀分散。x射线衍射（XRD）分析表明，CaO-NF和EC的掺入促进了CS基体中无定形区域的形成，促进了离子的传递，离子交换容量（IEC）达到3.5 meq。CS/CaO1/EC1膜的质子电导率为166 mS cm−1。阿伦尼乌斯分析显示，在加入优化量的纳米填料和增塑剂后，活化能降低，证实了膜基质内离子传输效率的提高。当添加1 wt%的CaO-NF时，达到了最大的化学稳定性，将膜的耐久性从原始CS膜的70 h延长到86 h；CS/CaO1膜中加入EC后，稳定性下降。通过与文献中报道的商用pem的比较，CS/CaO1/EC1膜具有极好的质子导电性以及优异的热稳定性、化学稳定性和机械性能，突出了其在高性能燃料电池应用中的潜力。

{"title":"Role of hygroscopic nanofillers and plasticizer in enhancing ionic transport and structural stability of plasticized chitosan-based nanocomposite polymer electrolyte membranes for fuel cells","authors":"Qamber Ali , Taweesak Boonsod , Rojana Pornprasertsuk , Wanwisa Limphirat , Wirach Taweepreda , Kanoktip Boonkerd","doi":"10.1016/j.matchemphys.2026.132212","DOIUrl":"10.1016/j.matchemphys.2026.132212","url":null,"abstract":"<div><div>The growing demand for high-performance, environmentally friendly, and cost-effective polymer electrolyte membranes (PEMs) has driven increasing interest in natural polymer-based materials. Chitosan (CS), a renewable and biodegradable biopolymer, offers a promising alternative to conventional synthetic PEMs but suffers from limited proton conductivity and stability. This work systematically investigated the incorporation of hygroscopic nanofiller (calcium oxide nanofiller, CaO–NF) and plasticizer (ethylene carbonate, EC) into a CS matrix and their effects on PEMs’ performance. Fourier-transform infrared (FTIR) analysis confirmed the formation of hydrogen-bonding interactions among the CS matrix, CaO–NF, and EC. Scanning electron microscopy coupled with energy dispersive spectroscopy (SEM-EDS) revealed a homogeneous dispersion of CaO–NF throughout the CS matrix. X-ray diffraction (XRD) analysis showed that the incorporation of CaO–NF and EC promoted the formation of amorphous region in the CS matrix, facilitating ion transport and resulting in a high ion-exchange capacity (IEC) of 3.5 meq.g<sup>−1</sup> and a proton conductivity of 166 mS cm<sup>−1</sup> for the CS/CaO<sub>1</sub>/EC<sub>1</sub> membrane. Arrhenius analysis revealed a reduction in activation energy upon the incorporation of an optimized amount of nanofiller and plasticizer, confirming enhanced ion transport efficiency within the membrane matrix. The maximum chemical stability was achieved with the incorporation of 1 wt% CaO–NF, extending membrane durability to 86 h compared with 70 h for the pristine CS membrane; however, the stability decreased when EC was added to the CS/CaO<sub>1</sub> membrane. Based on comparisons with commercial PEMs reported in the literature, the CS/CaO<sub>1</sub>/EC<sub>1</sub> membrane exhibited competitive proton conductivity together with excellent thermal stability, chemical stability, and mechanical properties, highlighting its potential for high-performance fuel cell applications.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"354 ","pages":"Article 132212"},"PeriodicalIF":4.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146191915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of heat treatment on the microstructural evolution, mechanical behaviour and strengthening mechanisms of additively manufactured AlSi9Cu3 alloy 热处理对增材制造AlSi9Cu3合金组织演变、力学行为及强化机制的影响

IF 4.7 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2026-04-15 Epub Date: 2026-02-04 DOI: 10.1016/j.matchemphys.2026.132140

R. Ramesh , Saurabh Gairola , R. Jayaganthan , M. Kamaraj

The present study focuses on AlSi9Cu3 alloy produced using the Laser Powder Bed Fusion (LPBF). The components produced using LPBF have higher dislocation density due to cyclic heating that occurs during printing. Heat Treatment is crucial for lowering the dislocation density by homogenising the microstructure and enhancing mechanical properties. The alloy in its as-built condition is subjected to various heat treatments (stress relief, solution treatment and T6 aging treatment) and the hardness, tensile strength, and fracture toughness, along with their corresponding strengthening mechanisms, were examined in relation to its microstructural evolution. The alloy in as-built condition exhibits a hardness of 137 HV and a tensile strength of 487 MPa, attributed to the presence of Si network and a higher dislocation density. Stress relief treatment reduced the strength and hardness due to the fragmentation of the Si network, while solution treatment homogenized the microstructure. In the T6 condition, the formation of very fine Al₂Cu precipitates restores the hardness, tensile strength, and fracture toughness. Dislocation and Si-network strengthening, as well as precipitation strengthening mechanisms, are the dominant mechanisms in the as-built condition and T6 conditions, respectively.

本文主要研究了激光粉末床熔合法制备AlSi9Cu3合金。由于在印刷过程中发生循环加热，使用LPBF生产的组件具有更高的位错密度。热处理是通过均匀化组织和提高力学性能来降低位错密度的关键。对铸态合金进行各种热处理（去应力处理、固溶处理和T6时效处理），研究其硬度、抗拉强度和断裂韧性及其强化机制与显微组织演变的关系。由于Si网络的存在和较高的位错密度，合金在构建状态下的硬度为137 HV，抗拉强度为487 MPa。应力消除处理使Si网络破碎，降低了强度和硬度，固溶处理使组织均匀化。在T6条件下，极细Al2Cu析出物的形成恢复了硬度、抗拉强度和断裂韧性。在建成条件和T6条件下，位错强化机制和硅网络强化机制以及沉淀强化机制分别占主导地位。

{"title":"Influence of heat treatment on the microstructural evolution, mechanical behaviour and strengthening mechanisms of additively manufactured AlSi9Cu3 alloy","authors":"R. Ramesh , Saurabh Gairola , R. Jayaganthan , M. Kamaraj","doi":"10.1016/j.matchemphys.2026.132140","DOIUrl":"10.1016/j.matchemphys.2026.132140","url":null,"abstract":"<div><div>The present study focuses on AlSi9Cu3 alloy produced using the Laser Powder Bed Fusion (LPBF). The components produced using LPBF have higher dislocation density due to cyclic heating that occurs during printing. Heat Treatment is crucial for lowering the dislocation density by homogenising the microstructure and enhancing mechanical properties. The alloy in its as-built condition is subjected to various heat treatments (stress relief, solution treatment and T6 aging treatment) and the hardness, tensile strength, and fracture toughness, along with their corresponding strengthening mechanisms, were examined in relation to its microstructural evolution. The alloy in as-built condition exhibits a hardness of 137 HV and a tensile strength of 487 MPa, attributed to the presence of Si network and a higher dislocation density. Stress relief treatment reduced the strength and hardness due to the fragmentation of the Si network, while solution treatment homogenized the microstructure. In the T6 condition, the formation of very fine Al<sub>2</sub>Cu precipitates restores the hardness, tensile strength, and fracture toughness. Dislocation and Si-network strengthening, as well as precipitation strengthening mechanisms, are the dominant mechanisms in the as-built condition and T6 conditions, respectively.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"354 ","pages":"Article 132140"},"PeriodicalIF":4.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146192206","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Star-shaped donor-acceptor arylsilanes as 3D ambipolar materials for optoelectronic and bioelectronic applications 星形给受体芳基硅烷作为光电和生物电子应用的三维双极性材料

IF 4.7 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2026-04-15 Epub Date: 2026-01-29 DOI: 10.1016/j.matchemphys.2026.132152

Dmitry O. Balakirev , Elena A. Kleymyuk , Evgenia A. Svidchenko , Nikolay M. Surin , Sergey A. Pisarev , Artem V. Bakirov , Yulia A. Isaeva , Michael D. Khitrov , Artur L. Mannanov , Svetlana M. Peregudova , Anastasia A. Vetyugova , Askold A. Trul , Olga A. Maloshitskaya , Sergei A. Ponomarenko , Yuriy N. Luponosov

Novel donor-acceptor arylsilane molecules, Si(PP-DCV)4 and Si(PT-DCV)4, featuring three-dimensional star-shaped geometries, were synthesized and investigated in comparison to model compounds. These compounds, comprising a tetraphenylsilane core linked to terminal phenyldicyanovinyl groups through phenylene or thienyl π-spacers, exhibit a range of promising physicochemical properties, including high thermal stability (up to 490 °C), deep-lying HOMO energy levels (up to −6.4 eV), ambipolar charge carrier mobility, efficient light absorption, and high crystallinity. A comprehensive experimental and theoretical investigation, in comparison to model compounds, revealed the nonordinal optical properties of these compounds, elucidating the nature of electronic transitions and fluorescence efficiency. Substitution of the phenylene spacer with a thiophene spacer led to significant changes, including a red shift in the absorption spectrum, an increased extinction coefficient, lower HOMO energy levels, enhanced crystallinity, and improved ambipolar charge carrier mobility in films. Additionally, the polar and amphiphilic nature of these donor-acceptor molecules enabled the formation of stable nanoparticles (50–110 nm) in aqueous solutions without surfactants. These findings highlight the potential of these materials for applications in optoelectronic and biological applications.

合成了具有三维星形结构的新型芳基硅烷分子Si(PP-DCV)4和Si(PT-DCV)4，并与模型化合物进行了对比研究。这些化合物由四苯基硅烷核心组成，通过苯基或噻吩基π间隔剂连接到末端苯基二氰乙烯基，表现出一系列有希望的物理化学性质，包括高热稳定性（高达490°C），深层HOMO能级（高达- 6.4 eV），双极性载流子迁移率，高效的光吸收和高结晶度。综合实验和理论研究，与模型化合物比较，揭示了这些化合物的非序数光学性质，阐明了电子跃迁和荧光效率的本质。用噻吩取代苯基间隔剂导致了显著的变化，包括吸收光谱的红移、消光系数的增加、HOMO能级的降低、结晶度的增强以及薄膜中双极性载流子迁移率的提高。此外，这些供体-受体分子的极性和两亲性使得在没有表面活性剂的水溶液中形成稳定的纳米颗粒（50-110 nm）。这些发现突出了这些材料在光电和生物应用方面的潜力。

{"title":"Star-shaped donor-acceptor arylsilanes as 3D ambipolar materials for optoelectronic and bioelectronic applications","authors":"Dmitry O. Balakirev , Elena A. Kleymyuk , Evgenia A. Svidchenko , Nikolay M. Surin , Sergey A. Pisarev , Artem V. Bakirov , Yulia A. Isaeva , Michael D. Khitrov , Artur L. Mannanov , Svetlana M. Peregudova , Anastasia A. Vetyugova , Askold A. Trul , Olga A. Maloshitskaya , Sergei A. Ponomarenko , Yuriy N. Luponosov","doi":"10.1016/j.matchemphys.2026.132152","DOIUrl":"10.1016/j.matchemphys.2026.132152","url":null,"abstract":"<div><div>Novel donor-acceptor arylsilane molecules, <strong>Si(PP-DCV)4</strong> and <strong>Si(PT-DCV)4</strong>, featuring three-dimensional star-shaped geometries, were synthesized and investigated in comparison to model compounds. These compounds, comprising a tetraphenylsilane core linked to terminal phenyldicyanovinyl groups through phenylene or thienyl π-spacers, exhibit a range of promising physicochemical properties, including high thermal stability (up to 490 °C), deep-lying HOMO energy levels (up to −6.4 eV), ambipolar charge carrier mobility, efficient light absorption, and high crystallinity. A comprehensive experimental and theoretical investigation, in comparison to model compounds, revealed the nonordinal optical properties of these compounds, elucidating the nature of electronic transitions and fluorescence efficiency. Substitution of the phenylene spacer with a thiophene spacer led to significant changes, including a red shift in the absorption spectrum, an increased extinction coefficient, lower HOMO energy levels, enhanced crystallinity, and improved ambipolar charge carrier mobility in films. Additionally, the polar and amphiphilic nature of these donor-acceptor molecules enabled the formation of stable nanoparticles (50–110 nm) in aqueous solutions without surfactants. These findings highlight the potential of these materials for applications in optoelectronic and biological applications.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"354 ","pages":"Article 132152"},"PeriodicalIF":4.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146190778","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nickel pyrophosphate: Development, physicochemical properties and theoretical perspectives for energy storage and catalysis 焦磷酸镍：能源储存与催化的发展、理化性质及理论展望

IF 4.7 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2026-04-15 Epub Date: 2026-02-05 DOI: 10.1016/j.matchemphys.2025.132004

Chaimaa Moukhfi , Abdelmalek Matine , Adil Chakir , Youssef Ghandi , Ali Barhoumi , Soufiane Zerraf , Mohamed Elalaoui Belghiti , Brahim El Bali , Said Belaaouad

This study focuses on the synthesis and characterization of nickel pyrophosphate (Ni₂P₂O₇), a promising material for energy storage and catalysis applications. Ni₂P₂O₇ was prepared by solid-state reaction from nickel oxide and phosphate, followed by extensive characterization by different experimental and theoretical techniques. X-ray diffraction analysis confirmed the formation of a monoclinic α-Ni₂P₂O₇ phase. Infrared and UV–Visible spectroscopy revealed the vibrational and optical properties of the material. Morphological analysis by transmission electron microscopy revealed a heterogeneous structure with grains ranging in size from 155 to 541 nm.

Theoretical calculations based on density functional theory allowed us to examine the chemical reactivity of Ni₂P₂O₇, revealing good stability of the material. The study of the molecular electrostatic surface and Hirshfeld analysis highlighted the active sites of the material, essential for its catalytic and electrochemical performances. Additionally, Monte Carlo simulations were conducted to evaluate the hydrogen adsorption on the Ni₂P₂O₇ (110) surface, showing an improvement in the adsorption efficiency with increasing H₂ concentration. These results highlight the potential of Ni₂P₂O₇ for applications in energy storage and conversion technologies.

研究了焦磷酸镍（Ni2P2O7）的合成和表征，这是一种极具储能和催化应用前景的材料。以氧化镍和磷酸盐为原料，采用固相反应法制备了Ni2P2O7，并用不同的实验和理论技术对Ni2P2O7进行了广泛的表征。x射线衍射分析证实形成单斜相α-Ni2P2O7。红外光谱和紫外可见光谱揭示了材料的振动和光学性质。透射电镜形貌分析显示其晶粒大小在155 ~ 541 nm之间，呈非均质结构。基于密度泛函理论的理论计算使我们能够检查Ni2P2O7的化学反应性，揭示了材料的良好稳定性。分子静电表面的研究和Hirshfeld分析强调了材料的活性位点，这对其催化和电化学性能至关重要。此外，通过蒙特卡罗模拟对Ni2P2O7（110）表面的氢吸附进行了评价，结果表明，随着H2浓度的增加，Ni2P2O7（110）表面的氢吸附效率有所提高。这些结果突出了Ni2P2O7在能量存储和转换技术中的应用潜力。

{"title":"Nickel pyrophosphate: Development, physicochemical properties and theoretical perspectives for energy storage and catalysis","authors":"Chaimaa Moukhfi , Abdelmalek Matine , Adil Chakir , Youssef Ghandi , Ali Barhoumi , Soufiane Zerraf , Mohamed Elalaoui Belghiti , Brahim El Bali , Said Belaaouad","doi":"10.1016/j.matchemphys.2025.132004","DOIUrl":"10.1016/j.matchemphys.2025.132004","url":null,"abstract":"<div><div>This study focuses on the synthesis and characterization of nickel pyrophosphate (Ni<sub>2</sub>P<sub>2</sub>O<sub>7</sub>), a promising material for energy storage and catalysis applications. Ni<sub>2</sub>P<sub>2</sub>O<sub>7</sub> was prepared by solid-state reaction from nickel oxide and phosphate, followed by extensive characterization by different experimental and theoretical techniques. X-ray diffraction analysis confirmed the formation of a monoclinic α-Ni<sub>2</sub>P<sub>2</sub>O<sub>7</sub> phase. Infrared and UV–Visible spectroscopy revealed the vibrational and optical properties of the material. Morphological analysis by transmission electron microscopy revealed a heterogeneous structure with grains ranging in size from 155 to 541 nm.</div><div>Theoretical calculations based on density functional theory allowed us to examine the chemical reactivity of Ni<sub>2</sub>P<sub>2</sub>O<sub>7</sub>, revealing good stability of the material. The study of the molecular electrostatic surface and Hirshfeld analysis highlighted the active sites of the material, essential for its catalytic and electrochemical performances. Additionally, Monte Carlo simulations were conducted to evaluate the hydrogen adsorption on the Ni<sub>2</sub>P<sub>2</sub>O<sub>7</sub> (110) surface, showing an improvement in the adsorption efficiency with increasing H<sub>2</sub> concentration. These results highlight the potential of Ni<sub>2</sub>P<sub>2</sub>O<sub>7</sub> for applications in energy storage and conversion technologies.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"354 ","pages":"Article 132004"},"PeriodicalIF":4.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146191526","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tailoring concentration of copper oxide materials to optimizing the morphological and electrochemical properties for symmetric supercapacitor devices 调整氧化铜材料浓度以优化对称超级电容器器件的形态和电化学性能

IF 4.7 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2026-04-15 Epub Date: 2026-01-29 DOI: 10.1016/j.matchemphys.2026.132138

Pooja A. Desai , Aishwarya A. Admuthe , Dhanaji B. Malavekar , Jin H. Kim , Raghunath H. Patil

The growing global demand for sustainable and efficient energy systems has intensified the need for high-performance energy storage devices such as supercapacitors. In this study, copper oxide (CuO) thin films were synthesized on stainless steel (SS) substrates using a hydrothermal approach followed by annealing at 300 °C. The influence of Cu-precursor molarity on the structural, morphological, and electrochemical properties of the CuO thin films was systematically investigated. X-ray diffraction (XRD) analysis confirmed the formation of monoclinic CuO with a polycrystalline phase, favourable for electrochemical charge storage. Scanning electron microscopy (SEM) revealed that precursor concentration strongly affects surface morphology, while the Brunauer–Emmett–Teller (BET) study indicated that the 0.15 M CuO thin film possesses a high surface area of 24 m²g^-1 with mesoporous characteristics. XPS analysis confirmed the formation of phase-pure CuO with Cu existing predominantly in the Cu²⁺ oxidation state (characteristic Cu 2p_3/2, Cu 2p_1/2 splitting of ∼19.8 eV and distinct satellite peaks), while the O 1s spectrum revealed lattice oxygen along with oxygen-vacancy-related and surface hydroxyl components, indicating defect-rich CuO thin films. Fourier transform infrared spectroscopy (FTIR) confirmed the successful formation of CuO, and energy-dispersive X-ray (EDS) analysis verified the presence of Cu and O elements. Electrochemical testing in 1 M KOH electrolyte showed that the CuO thin film with 0.15 M precursor concentration exhibited an excellent specific capacitance (C_s) of 558 Fg^-1 at a scan rate of 5 mV/s and 299 Fg^-1 at a current density of 6 Ag^-1. The CuO//CuO symmetric supercapacitor device delivered a specific capacitance of 84 Fg^-1 at 5 mV/s within a potential window of 0–1.2 V and demonstrated 75.7 % capacitance retention after 2000 charge–discharge cycles. These results highlight that CuO thin films synthesized via the hydrothermal method are promising electrode materials for high-performance supercapacitors and energy storage applications.

随着全球对可持续和高效能源系统的需求不断增长，对超级电容器等高性能能源存储设备的需求也日益增加。在这项研究中，采用水热法在不锈钢（SS）衬底上合成了氧化铜（CuO）薄膜，然后在300°C下退火。系统地研究了cu前驱体摩尔浓度对CuO薄膜结构、形态和电化学性能的影响。x射线衍射（XRD）分析证实了单斜CuO的形成具有多晶相，有利于电化学电荷存储。扫描电镜（SEM）分析表明，前驱体浓度对表面形貌有明显影响，而brunauer - emmet - teller （BET）研究表明，0.15 M CuO薄膜具有24 mg2 -1的高表面积，具有介孔特征。XPS分析证实形成了相纯CuO， Cu主要存在于Cu2+氧化态（Cu 2p3/2， Cu 2p1/2分裂约19.8 eV和明显的卫星峰），而o1s光谱显示晶格氧以及氧空位相关成分和表面羟基成分，表明形成了富缺陷的CuO薄膜。傅里叶变换红外光谱（FTIR）证实了CuO的成功形成，能量色散x射线（EDS）分析证实了Cu和O元素的存在。在1 M KOH电解液中电化学测试表明，前驱体浓度为0.15 M的CuO薄膜在扫描速率为5 mV/s时的比电容Cs为558 Fg-1，在电流密度为6 Ag-1时的比电容Cs为299 Fg-1。该CuO//CuO对称超级电容器器件在0-1.2 V的电位窗口内，在5 mV/s下的比电容为84 Fg-1，在2000次充放电循环后的电容保持率为75.7%。这些结果表明，通过水热法合成的CuO薄膜是一种很有前途的高性能超级电容器和储能电极材料。

{"title":"Tailoring concentration of copper oxide materials to optimizing the morphological and electrochemical properties for symmetric supercapacitor devices","authors":"Pooja A. Desai , Aishwarya A. Admuthe , Dhanaji B. Malavekar , Jin H. Kim , Raghunath H. Patil","doi":"10.1016/j.matchemphys.2026.132138","DOIUrl":"10.1016/j.matchemphys.2026.132138","url":null,"abstract":"<div><div>The growing global demand for sustainable and efficient energy systems has intensified the need for high-performance energy storage devices such as supercapacitors. In this study, copper oxide (CuO) thin films were synthesized on stainless steel (SS) substrates using a hydrothermal approach followed by annealing at 300 °C. The influence of Cu-precursor molarity on the structural, morphological, and electrochemical properties of the CuO thin films was systematically investigated. X-ray diffraction (XRD) analysis confirmed the formation of monoclinic CuO with a polycrystalline phase, favourable for electrochemical charge storage. Scanning electron microscopy (SEM) revealed that precursor concentration strongly affects surface morphology, while the Brunauer–Emmett–Teller (BET) study indicated that the 0.15 M CuO thin film possesses a high surface area of 24 m<sup>2</sup>g<sup>-1</sup> with mesoporous characteristics. XPS analysis confirmed the formation of phase-pure CuO with Cu existing predominantly in the Cu<sup>2+</sup> oxidation state (characteristic Cu 2p<sub>3/2</sub>, Cu 2p<sub>1/2</sub> splitting of ∼19.8 eV and distinct satellite peaks), while the O 1s spectrum revealed lattice oxygen along with oxygen-vacancy-related and surface hydroxyl components, indicating defect-rich CuO thin films. Fourier transform infrared spectroscopy (FTIR) confirmed the successful formation of CuO, and energy-dispersive X-ray (EDS) analysis verified the presence of Cu and O elements. Electrochemical testing in 1 M KOH electrolyte showed that the CuO thin film with 0.15 M precursor concentration exhibited an excellent specific capacitance (C<sub>s</sub>) of 558 Fg<sup>-1</sup> at a scan rate of 5 mV/s and 299 Fg<sup>-1</sup> at a current density of 6 Ag<sup>-1</sup>. The CuO//CuO symmetric supercapacitor device delivered a specific capacitance of 84 Fg<sup>-1</sup> at 5 mV/s within a potential window of 0–1.2 V and demonstrated 75.7 % capacitance retention after 2000 charge–discharge cycles. These results highlight that CuO thin films synthesized via the hydrothermal method are promising electrode materials for high-performance supercapacitors and energy storage applications.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"354 ","pages":"Article 132138"},"PeriodicalIF":4.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146191535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Benzothiazole-conjugated perylene diimide/functionalized reduced graphene oxide composite electrode for flexible supercapacitors 柔性超级电容器用苯并噻唑共轭苝酰亚胺/功能化还原氧化石墨烯复合电极

IF 4.7 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2026-04-15 Epub Date: 2026-02-07 DOI: 10.1016/j.matchemphys.2026.132170

Sudhir D. Jagadale , Sidhanath V. Bhosale , Sheshanath V. Bhosale

The development of flexible devices based on organic small molecules (OSMs) will be a crucial advantage in modern portable and wearable electronic appliances. In this work, we investigate the energy storage capacity of benzothiazole functionalized perylene diimides such as 2,9-bis(6-methoxybenzo[d]thiazol-2-yl)anthra[2,1,9-def:6,5,10-d'e'f'] diisoquin oline-1,3,8,10(2H,9H)-tetraone (PDI-BTH1) and 2,9-bis(6-hydroxybenzo[d]thiazol-2-yl)anthra[2,1,9-def:6,5,10-d'e'f'] diisoquinoline-1,3,8,10(2H,9H)-tetraone (PDI-BTH2)-reduced graphene oxide (rGO) composite-based electrode materials. The PDI-BTH1/rGO and PDI-BTH2/rGO- based three-electrode supercapacitor (SC) device delivered excellent specific capacitance (C_sp) of about 350 and 295.92 F g⁻¹ at 1 A g⁻¹ current density. The presence of the methoxy (–OCH₃) group in the organic molecular skeleton influences the C_sp of the electrode in the SC device. Moreover, in two-electrode PDI-BTH1/rGO//PDI-BTH1/rGO symmetric supercapacitor devices at 0.5 A g⁻¹ offers remarkable C_sp of 321.08 F g⁻¹ and outstanding energy density (ED) of 57.79 Wh kg⁻¹ at 1079.37 W kg⁻¹ power density (PD) with impressive cycling stability of 106.74% after 10000 gravimetric charging and discharging (GCD) cycles. Furthermore, the flexible device has been developed by depositing the PDI-BTH1/rGO electrode layer on graphite foil (GF). By assembling the PDI-BTH1/rGO//PDI-BTH1/rGO on a graphite foil (GF) surface in two-electrode flexible symmetric supercapacitor (FSSC) devices, the electrochemical performance was measured. The electrochemical studies showed that the FSSC device with its two structures with bending angles of 0° and 180° exhibits an excellent C_sp of 66.40 mF cm⁻² and 57.90 mF cm⁻², respectively, at 0.5 mA cm⁻². After 5000 GCD cycles, both the FSSC devices with 0° and 180° bending angles exhibited excellent cycling stability with 94.98% and 84.55% C_sp retention. The flexible flat SSC device displayed ED of 11.95 μWh cm⁻² at 1.66 mW cm⁻² PD. Therefore, these FSSC devices represent significant potential for electronics.

基于有机小分子（osm）的柔性器件的发展将是现代便携式和可穿戴电子设备的关键优势。在这项工作中，我们研究了苯并噻唑功能化的苝酰二亚胺的储能能力，如2,9-二（6-甲氧基苯并[d]噻唑-2-基）蒽[2,1,9-def:6,5,10-d' f']二异喹啉-1,3,8,10(2H,9H)-四酮（PDI-BTH1）和2,9-二（6-羟基苯并[d]噻唑-2-基）蒽[2,1,9-def:6,5,10-d' f']二异喹啉-1,3,8,10(2H,9H)-四酮(PDI-BTH2)-还原氧化石墨烯（rGO）复合电极材料。基于PDI-BTH1/rGO和PDI-BTH2/rGO的三电极超级电容器（SC）器件在1 A g−1电流密度下具有优异的比电容（Csp），分别为350和295.92 F g−1。有机分子骨架中甲氧基（-OCH3）的存在影响SC装置中电极的Csp。此外，在双电极条件下，PDI-BTH1/rGO//PDI-BTH1/rGO对称超级电容器器件在0.5 A g−1下的Csp值为321.08 F g−1，在1079.37 W kg−1功率密度（PD）下的能量密度（ED）为57.79 Wh kg−1，在10000次重力充放电（GCD）循环后的循环稳定性为106.74%。此外，通过在石墨箔（GF）上沉积PDI-BTH1/rGO电极层，开发了柔性器件。通过将PDI-BTH1/rGO//PDI-BTH1/rGO组装在双电极柔性对称超级电容器（FSSC）器件的石墨箔（GF）表面，测量了其电化学性能。电化学研究表明，弯曲角度为0°和180°的两种结构的FSSC器件在0.5 mA cm - 2下的Csp值分别为66.40 mF cm - 2和57.90 mF cm - 2。经过5000次GCD循环后，弯曲角度为0°和180°的FSSC器件均表现出良好的循环稳定性，Csp保留率分别为94.98%和84.55%。在1.66 mW cm - 2 PD下，柔性平面SSC器件显示出11.95 μWh cm - 2的ED。因此，这些FSSC器件代表了电子学的巨大潜力。

{"title":"Benzothiazole-conjugated perylene diimide/functionalized reduced graphene oxide composite electrode for flexible supercapacitors","authors":"Sudhir D. Jagadale , Sidhanath V. Bhosale , Sheshanath V. Bhosale","doi":"10.1016/j.matchemphys.2026.132170","DOIUrl":"10.1016/j.matchemphys.2026.132170","url":null,"abstract":"<div><div>The development of flexible devices based on organic small molecules (OSMs) will be a crucial advantage in modern portable and wearable electronic appliances. In this work, we investigate the energy storage capacity of benzothiazole functionalized perylene diimides such as 2,9-bis(6-methoxybenzo[<em>d</em>]thiazol-2-yl)anthra[2,1,9-def:6,5,10-d'e'f'] diisoquin oline-1,3,8,10(2H,9H)-tetraone (PDI-BTH1) and 2,9-bis(6-hydroxybenzo[<em>d</em>]thiazol-2-yl)anthra[2,1,9-def:6,5,10-d'e'f'] diisoquinoline-1,3,8,10(2H,9H)-tetraone (PDI-BTH2)-reduced graphene oxide (rGO) composite-based electrode materials. The PDI-BTH1/rGO and PDI-BTH2/rGO- based three-electrode supercapacitor (SC) device delivered excellent specific capacitance (<em>C</em><sub>sp</sub>) of about 350 and 295.92 F g<sup>−1</sup> at 1 A g<sup>−1</sup> current density. The presence of the methoxy (–OCH<sub>3</sub>) group in the organic molecular skeleton influences the <em>C</em><sub>sp</sub> of the electrode in the SC device. Moreover, in two-electrode PDI-BTH1/rGO//PDI-BTH1/rGO symmetric supercapacitor devices at 0.5 A g<sup>−1</sup> offers remarkable <em>C</em><sub>sp</sub> of 321.08 F g<sup>−1</sup> and outstanding energy density (ED) of 57.79 Wh kg<sup>−1</sup> at 1079.37 W kg<sup>−1</sup> power density (PD) with impressive cycling stability of 106.74% after 10000 gravimetric charging and discharging (GCD) cycles. Furthermore, the flexible device has been developed by depositing the PDI-BTH1/rGO electrode layer on graphite foil (GF). By assembling the PDI-BTH1/rGO//PDI-BTH1/rGO on a graphite foil (GF) surface in two-electrode flexible symmetric supercapacitor (FSSC) devices, the electrochemical performance was measured. The electrochemical studies showed that the FSSC device with its two structures with bending angles of 0° and 180° exhibits an excellent <em>C</em><sub>sp</sub> of 66.40 mF cm<sup>−2</sup> and 57.90 mF cm<sup>−2</sup>, respectively, at 0.5 mA cm<sup>−2</sup>. After 5000 GCD cycles, both the FSSC devices with 0° and 180° bending angles exhibited excellent cycling stability with 94.98% and 84.55% <em>C</em><sub>sp</sub> retention. The flexible flat SSC device displayed ED of 11.95 μWh cm<sup>−2</sup> at 1.66 mW cm<sup>−2</sup> PD. Therefore, these FSSC devices represent significant potential for electronics.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"354 ","pages":"Article 132170"},"PeriodicalIF":4.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146191596","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Strain-induced martensitic transformation and mechanical properties of additively manufactured AISI 316L austenitic stainless steel 增材制造AISI 316L奥氏体不锈钢的应变诱导马氏体相变及力学性能

IF 4.7 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2026-04-15 Epub Date: 2026-02-11 DOI: 10.1016/j.matchemphys.2026.132219

Nasim Maboudi Far , Rouhollah Mehdinavaz Aghdam , Hamed Mirzadeh , Farid Gharibi Asl , Arian Najjari

Strain-induced martensitic transformation and mechanical properties of AISI 316L austenitic stainless steel manufactured via the powder bed fusion (PBF) method known as selective laser melting (SLM) was investigated and compared with the conventionally manufactured as-annealed counterpart. At a comparable grain size, it was observed that the yield and tensile strengths of the as-SLM fabricated sample were higher compared to the as-annealed sample, which was attributed to the high dislocation density in the former due to the fast solidification and inherent thermal gradients in the SLM process. To investigate the effect of manufacturing process on the strain-induced martensitic transformation, cold rolling with varying reductions in thickness (15 to 75%) was performed on both samples. Cold rolling promoted the formation of α′-martensite within the deformed austenitic matrix, similar to the advanced high-strength steels with transformation-induced plasticity effect, where both the martensite volume fraction and dislocation density in the as-SLM samples were higher than those in the as-annealed counterparts. Kinetics analysis by the Olson–Cohen model revealed that the initial microstructure of the as-SLM sample promotes the martensitic transformation. Based on the X-ray diffraction (XRD) patterns, the obtained relative texture coefficient (RTC) values revealed the promotion of a strong 220-type reflection during cold rolling. Vickers hardness similarly increased with higher thickness reductions due to the combined effect of enhanced dislocation density and martensite content, with a more pronounced increase observed in the as-SLM samples.

研究了采用选择性激光熔化（SLM）方法制备的aisi316l奥氏体不锈钢的应变诱导马氏体相变和力学性能，并与常规制备的退火不锈钢进行了比较。在相同晶粒尺寸下，与退火试样相比，原位SLM制备样品的屈服强度和抗拉强度更高，这是由于原位SLM过程中快速凝固和固有的热梯度导致原位SLM中位错密度高。为了研究制造工艺对应变诱导马氏体相变的影响，对两种样品进行了不同厚度减薄（15 - 75%）的冷轧。冷轧促进了形变奥氏体基体内α′-马氏体的形成，类似于具有相变诱发塑性效应的高级高强钢，其中低温轧制试样的马氏体体积分数和位错密度均高于退火试样。动力学分析表明，as-SLM试样的初始组织促进了马氏体相变。基于x射线衍射（XRD）分析，得到的相对织构系数（RTC）值表明，冷轧过程促进了强220型反射。由于位错密度和马氏体含量增加的共同作用，随着厚度减小，维氏硬度也随之增加，在as-SLM样品中观察到更明显的增加。

{"title":"Strain-induced martensitic transformation and mechanical properties of additively manufactured AISI 316L austenitic stainless steel","authors":"Nasim Maboudi Far , Rouhollah Mehdinavaz Aghdam , Hamed Mirzadeh , Farid Gharibi Asl , Arian Najjari","doi":"10.1016/j.matchemphys.2026.132219","DOIUrl":"10.1016/j.matchemphys.2026.132219","url":null,"abstract":"<div><div>Strain-induced martensitic transformation and mechanical properties of AISI 316L austenitic stainless steel manufactured via the powder bed fusion (PBF) method known as selective laser melting (SLM) was investigated and compared with the conventionally manufactured as-annealed counterpart. At a comparable grain size, it was observed that the yield and tensile strengths of the as-SLM fabricated sample were higher compared to the as-annealed sample, which was attributed to the high dislocation density in the former due to the fast solidification and inherent thermal gradients in the SLM process. To investigate the effect of manufacturing process on the strain-induced martensitic transformation, cold rolling with varying reductions in thickness (15 to 75%) was performed on both samples. Cold rolling promoted the formation of α′-martensite within the deformed austenitic matrix, similar to the advanced high-strength steels with transformation-induced plasticity effect, where both the martensite volume fraction and dislocation density in the as-SLM samples were higher than those in the as-annealed counterparts. Kinetics analysis by the Olson–Cohen model revealed that the initial microstructure of the as-SLM sample promotes the martensitic transformation. Based on the X-ray diffraction (XRD) patterns, the obtained relative texture coefficient (RTC) values revealed the promotion of a strong 220-type reflection during cold rolling. Vickers hardness similarly increased with higher thickness reductions due to the combined effect of enhanced dislocation density and martensite content, with a more pronounced increase observed in the as-SLM samples.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"354 ","pages":"Article 132219"},"PeriodicalIF":4.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146191627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mesoporous ZnFe-layered double hydroxide electrodes via an electrochemical approach for high-performance supercapacitors 采用电化学方法制备高性能超级电容器的介孔znfe层状双氢氧化物电极

IF 4.7 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2026-04-15 Epub Date: 2026-01-31 DOI: 10.1016/j.matchemphys.2026.132158

Alfiya M. Nadeghar , Avinash C. Molane , Shailesh G. Pawar , Ramesh N. Mulik , Manickam Selvaraj , Arun Karnwal , Prakash A. Mahanwar , Vikas B. Patil

Layered double hydroxides (LDHs), known for their unique anion-exchange capability and adjustable interlayer spacing, have emerged as splendid electroactive materials for supercapacitors featuring an extensive surface area and impressive theoretical capacitance. Hence, mesoporous ZnFe-layered double hydroxide thin film electrodes were prepared by the one-step electrochemical method. The prepared ZnFe-LDH thin films were characterized by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), Field emission scanning electron microscopy (FESEM), High-resolution transmission electron microscopy (HRTEM), and Contact angle measurement. Here, with the increase in the concentration of Zn²⁺, the electrochemical performance and morphology of ZnFe-LDH electrodes have changed. The electrochemical performance of ZnFe-LDH electrodes was tested in different electrolytes as KOH, NaOH, and KCl, by varying concentrations at the potential window of 1.2 V by cyclic voltammetry (CV), galvanostatic charging/discharging (GCD), and electrochemical impedance spectroscopy (EIS). The ZnFe-LDH3 electrode delivered the maximum specific capacitance of 950.23 F/g at 5 mV/s, specific energy 77.45 Wh/kg, specific power 5.41 kW/kg and 99.30 % of coulombic efficiency with 84.94 % capacitance retention rate over 10000 cycles at 100 mV/s scan rate. This can be attributed to the hierarchical structure, improved hydrophilicity, fast reversible redox reactions, and the material's high surface area of 35.73 m²/g. Furthermore, the assembled ZnFe-LDH3 symmetric device achieved the maximum specific energy of 19.52 Wh/kg and specific power of 2.18 kW/kg with an 80.2 % retention rate over 10000 cycles. These findings highlight the potential of ZnFe-LDH3 is a promising electrode material for supercapacitor applications.

层状双氢氧化物（LDHs）以其独特的阴离子交换能力和可调节的层间间距而闻名，已成为超级电容器的优秀电活性材料，具有广泛的表面积和令人印象深刻的理论电容。为此，采用一步电化学方法制备了介孔znfe层状双氢氧化物薄膜电极。采用x射线衍射（XRD）、布鲁诺尔-埃米特-泰勒（BET）、x射线光电子能谱（XPS）、傅里叶变换红外光谱（FTIR）、场发射扫描电镜（FESEM）、高分辨率透射电镜（HRTEM）和接触角测量对制备的ZnFe-LDH薄膜进行了表征。随着Zn2+浓度的增加，ZnFe-LDH电极的电化学性能和形貌发生了变化。采用循环伏安法（CV）、恒流充放电法（GCD）和电化学阻抗法（EIS）测试了ZnFe-LDH电极在KOH、NaOH和KCl等不同电位窗口下的电化学性能。ZnFe-LDH3电极在5 mV/s下的最大比电容为950.23 F/g，比能量为77.45 Wh/kg，比功率为5.41 kW/kg，库仑效率为99.30%，在100 mV/s扫描速率下，超过10000次循环的电容保持率为84.94%。这可归因于分层结构，改善的亲水性，快速的可逆氧化还原反应，以及材料的35.73 m2/g的高表面积。此外，组装的ZnFe-LDH3对称器件的最大比能量为19.52 Wh/kg，比功率为2.18 kW/kg，在10000次循环中保持率为80.2%。这些发现突出了ZnFe-LDH3是一种有前途的超级电容器电极材料的潜力。

{"title":"Mesoporous ZnFe-layered double hydroxide electrodes via an electrochemical approach for high-performance supercapacitors","authors":"Alfiya M. Nadeghar , Avinash C. Molane , Shailesh G. Pawar , Ramesh N. Mulik , Manickam Selvaraj , Arun Karnwal , Prakash A. Mahanwar , Vikas B. Patil","doi":"10.1016/j.matchemphys.2026.132158","DOIUrl":"10.1016/j.matchemphys.2026.132158","url":null,"abstract":"<div><div>Layered double hydroxides (LDHs), known for their unique anion-exchange capability and adjustable interlayer spacing, have emerged as splendid electroactive materials for supercapacitors featuring an extensive surface area and impressive theoretical capacitance. Hence, mesoporous ZnFe-layered double hydroxide thin film electrodes were prepared by the one-step electrochemical method. The prepared ZnFe-LDH thin films were characterized by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), Field emission scanning electron microscopy (FESEM), High-resolution transmission electron microscopy (HRTEM), and Contact angle measurement. Here, with the increase in the concentration of Zn<sup>2+</sup>, the electrochemical performance and morphology of ZnFe-LDH electrodes have changed. The electrochemical performance of ZnFe-LDH electrodes was tested in different electrolytes as KOH, NaOH, and KCl, by varying concentrations at the potential window of 1.2 V by cyclic voltammetry (CV), galvanostatic charging/discharging (GCD), and electrochemical impedance spectroscopy (EIS). The ZnFe-LDH3 electrode delivered the maximum specific capacitance of 950.23 F/g at 5 mV/s, specific energy 77.45 Wh/kg, specific power 5.41 kW/kg and 99.30 % of coulombic efficiency with 84.94 % capacitance retention rate over 10000 cycles at 100 mV/s scan rate. This can be attributed to the hierarchical structure, improved hydrophilicity, fast reversible redox reactions, and the material's high surface area of 35.73 m<sup>2</sup>/g. Furthermore, the assembled ZnFe-LDH3 symmetric device achieved the maximum specific energy of 19.52 Wh/kg and specific power of 2.18 kW/kg with an 80.2 % retention rate over 10000 cycles. These findings highlight the potential of ZnFe-LDH3 is a promising electrode material for supercapacitor applications.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"354 ","pages":"Article 132158"},"PeriodicalIF":4.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146098820","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0