Pub Date : 2024-11-19DOI: 10.1016/j.jallcom.2024.177608
Jiaqi Tang, Wenjuan Jia, Yang Wang, Yunjia Shi, Hai Huang, Guopeng Zhang
High entropy alloys (HEAs) have shown good mechanical, electrical, and magnetic properties; thus, they are considered as next-generation structural–functional integration materials. Recent investigations have reported that the “negative mixing enthalpy solid solution” strategy can improve strength–ductility synergy in HEAs {An et al., Nature, 2024, 625(7996)}. However, its effects on magnetic properties remain unknown. Here, CoCrFeNiMn10Si10 HEA (Si10) with high negative mixing enthalpy was fabricated via gas atomization. In this study, the effects of Si substitution and rapid solidification on the magnetic properties of alloy were mainly investigated. Results indicated that most as-atomized Si10 particles exhibited a fine dendritic face-centered cubic phase, whereas a minor body-centered cubic (BCC) phase and a Cr3Ni5Si2-type phase were found in ultrafine particles (less than 5 μm in diameter). Si substitution changed the magnetic transformation from Néel transformation (~50 K) in CoCrFeMnNi (Cantor) alloy to Curie transformation (~70 K) in Si10 alloy. The magnetization of the as-atomized Si10 powder was higher than that of the Cantor alloy and the as-homogenized Si10 powder, particularly at a temperature ranging from Curie temperature to ~800 K. The high magnetization of the as-atomized Si10 powder was primarily due to the presence of a metastable BCC phase and Cr3Ni5Si2-type phase. Moreover, a modified model was proposed to explain the magnetism of multicomponent alloys based on Slater’s equation, which is in accordance with the reported experimental studies.
{"title":"Phase evolution and magnetic properties of rapidly solidified Si-substituted CoCrFeMnNi high entropy alloy","authors":"Jiaqi Tang, Wenjuan Jia, Yang Wang, Yunjia Shi, Hai Huang, Guopeng Zhang","doi":"10.1016/j.jallcom.2024.177608","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177608","url":null,"abstract":"High entropy alloys (HEAs) have shown good mechanical, electrical, and magnetic properties; thus, they are considered as next-generation structural–functional integration materials. Recent investigations have reported that the “negative mixing enthalpy solid solution” strategy can improve strength–ductility synergy in HEAs {An et al., Nature, 2024, 625(7996)}. However, its effects on magnetic properties remain unknown. Here, CoCrFeNiMn<sub>10</sub>Si<sub>10</sub> HEA (Si10) with high negative mixing enthalpy was fabricated via gas atomization. In this study, the effects of Si substitution and rapid solidification on the magnetic properties of alloy were mainly investigated. Results indicated that most as-atomized Si10 particles exhibited a fine dendritic face-centered cubic phase, whereas a minor body-centered cubic (BCC) phase and a Cr<sub>3</sub>Ni<sub>5</sub>Si<sub>2</sub>-type phase were found in ultrafine particles (less than 5 μm in diameter). Si substitution changed the magnetic transformation from Néel transformation (~50<!-- --> <!-- -->K) in CoCrFeMnNi (Cantor) alloy to Curie transformation (~70<!-- --> <!-- -->K) in Si10 alloy. The magnetization of the as-atomized Si10 powder was higher than that of the Cantor alloy and the as-homogenized Si10 powder, particularly at a temperature ranging from Curie temperature to ~800<!-- --> <!-- -->K. The high magnetization of the as-atomized Si10 powder was primarily due to the presence of a metastable BCC phase and Cr<sub>3</sub>Ni<sub>5</sub>Si<sub>2</sub>-type phase. Moreover, a modified model was proposed to explain the magnetism of multicomponent alloys based on Slater’s equation, which is in accordance with the reported experimental studies.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"22 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142673395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-19DOI: 10.1016/j.jallcom.2024.177651
Hao Liu, Xuantong Lv, Qianru Zhang, Mengjiao Han, Qingqing Sun
High strength 7000 series Al alloys are quite sensitive to intergranular corrosion (IGC) and generally a trade-off between IGC resistance and hardness exists in such Al alloys. Here, by using ultrasonic shot peening (USSP) we fabricate a gradient AA7055 whose IGC is significantly enhanced in both 57 g/L NaCl + 10 mL/L H2O2 solution and 3.5 wt% NaCl solution, whereas the surface hardness increases by 10%. TEM microstructure characterization and nanoscale investigation of corrosion indicate that the improvement in IGC resistance can be attributed to the disappearance of grain boundary precipitates and precipitate free zones. Surface hardening mechanism is also revealed.
{"title":"Enhancing intergranular corrosion resistance of 7055 Al alloy by ultrasonic shot peening","authors":"Hao Liu, Xuantong Lv, Qianru Zhang, Mengjiao Han, Qingqing Sun","doi":"10.1016/j.jallcom.2024.177651","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177651","url":null,"abstract":"High strength 7000 series Al alloys are quite sensitive to intergranular corrosion (IGC) and generally a trade-off between IGC resistance and hardness exists in such Al alloys. Here, by using ultrasonic shot peening (USSP) we fabricate a gradient AA7055 whose IGC is significantly enhanced in both 57<!-- --> <!-- -->g/L NaCl + 10<!-- --> <!-- -->mL/L H<sub>2</sub>O<sub>2</sub> solution and 3.5<!-- --> <!-- -->wt% NaCl solution, whereas the surface hardness increases by 10%. TEM microstructure characterization and nanoscale investigation of corrosion indicate that the improvement in IGC resistance can be attributed to the disappearance of grain boundary precipitates and precipitate free zones. Surface hardening mechanism is also revealed.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"13 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142671001","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-19DOI: 10.1016/j.jallcom.2024.177657
A.A. Bhoite, V.A. Sawant, N.L. Tarwal
Supercapacitors (SCs), recognized for their exceptional power and relatively high energy densities, long lifespan, and lower production costs, have emerged as an ideal solution to meet the growing demand for energy storage applications. The performance of supercapacitors is significantly influenced by the choice of electrode materials, making the development of novel materials a key focus in the field of high-performance supercapacitors. Recently, NiCo2O4 has attracted considerable attention as an electrode material due to its notable advantages including high theoretical capacity, low cost, natural abundance, easy of synthesis, and excellent electronic conductivity. However, the performance of NiCo2O4 is constrained by its low electrical conductivity and limited surface area, which lead to significant capacity degradation. This review article offers a comprehensive overview of the synthesis approaches employed to develop nickel cobaltite and its composites for supercapacitor applications. It details various synthesis methods, including sol-gel, hydrothermal, chemical bath deposition, and electrospinning techniques, with a focus on optimizing synthesis parameters to improve the electrochemical performance of these composites. The review concludes with future perspectives on the advancement of spinel NiCo2O4 for use as supercapacitor electrodes.
{"title":"A brief review of Nickel cobaltite nanostructures and its composites for supercapacitor application","authors":"A.A. Bhoite, V.A. Sawant, N.L. Tarwal","doi":"10.1016/j.jallcom.2024.177657","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177657","url":null,"abstract":"Supercapacitors (SCs), recognized for their exceptional power and relatively high energy densities, long lifespan, and lower production costs, have emerged as an ideal solution to meet the growing demand for energy storage applications. The performance of supercapacitors is significantly influenced by the choice of electrode materials, making the development of novel materials a key focus in the field of high-performance supercapacitors. Recently, NiCo<sub>2</sub>O<sub>4</sub> has attracted considerable attention as an electrode material due to its notable advantages including high theoretical capacity, low cost, natural abundance, easy of synthesis, and excellent electronic conductivity. However, the performance of NiCo<sub>2</sub>O<sub>4</sub> is constrained by its low electrical conductivity and limited surface area, which lead to significant capacity degradation. This review article offers a comprehensive overview of the synthesis approaches employed to develop nickel cobaltite and its composites for supercapacitor applications. It details various synthesis methods, including sol-gel, hydrothermal, chemical bath deposition, and electrospinning techniques, with a focus on optimizing synthesis parameters to improve the electrochemical performance of these composites. The review concludes with future perspectives on the advancement of spinel NiCo<sub>2</sub>O<sub>4</sub> for use as supercapacitor electrodes.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"36 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142671005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-19DOI: 10.1016/j.jallcom.2024.177660
Jaehee Shin, Yunji Gwon, Seon Young Hwang, Sooyeon Bae, So Young Kim, Choong Kyun Rhee, Youngku Sohn
Electrochemical (EC) reduction of CO2 has gained significant interest for producing value-added products, especially with Cu-based electrodes. In this study, a Cu/Zn electrode was prepared via galvanic replacement and evaluated for its efficiency in generating C1 and C2+ products during EC CO2 reduction. Key experimental parameters included applied potentials, electrolyte concentrations, light irradiation, and electrode configurations. The Cu/Zn electrode demonstrated notably high selectivity for ethanol, alongside syngas (CO and H2) production. The formation of ethanol and CO was primarily influenced by the applied potential and electrolyte concentration. Post-reaction analysis revealed substantial changes in the electrode's morphology, crystal structure, oxidation states, and Cu/Zn ratios. These findings enhanced the understanding of ethanol production mechanisms and C1/C2+ product formation, contributing to the development of more effective bimetallic electrodes for CO2 reduction.
{"title":"Electrochemical CO2 reduction chemistry of C1 and C2+ products on Cu/Zn electrodes via galvanic replacement","authors":"Jaehee Shin, Yunji Gwon, Seon Young Hwang, Sooyeon Bae, So Young Kim, Choong Kyun Rhee, Youngku Sohn","doi":"10.1016/j.jallcom.2024.177660","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177660","url":null,"abstract":"Electrochemical (EC) reduction of CO<sub>2</sub> has gained significant interest for producing value-added products, especially with Cu-based electrodes. In this study, a Cu/Zn electrode was prepared via galvanic replacement and evaluated for its efficiency in generating C<sub>1</sub> and C<sub>2+</sub> products during EC CO<sub>2</sub> reduction. Key experimental parameters included applied potentials, electrolyte concentrations, light irradiation, and electrode configurations. The Cu/Zn electrode demonstrated notably high selectivity for ethanol, alongside syngas (CO and H<sub>2</sub>) production. The formation of ethanol and CO was primarily influenced by the applied potential and electrolyte concentration. Post-reaction analysis revealed substantial changes in the electrode's morphology, crystal structure, oxidation states, and Cu/Zn ratios. These findings enhanced the understanding of ethanol production mechanisms and C<sub>1</sub>/C<sub>2+</sub> product formation, contributing to the development of more effective bimetallic electrodes for CO<sub>2</sub> reduction.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"82 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142670954","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-19DOI: 10.1016/j.jallcom.2024.177656
Pınar Talay Pınar, Mehmet Gülcan, Yavuz Yardım
With the growing demand for high-performance supercapacitor materials, this study explores the synthesis and electrochemical evaluation of Ti3C2Tx (MXene), WS2 nanosheets, and MXene/WS2 nanocomposites. The aim is to develop materials with enhanced energy storage capabilities. To this end, the performance of MXene/WS2 nanocomposites was compared to that of the individual materials. MXene, WS2 nanosheets, and MXene/WS2 nanocomposites were synthesized through chemical and hydrothermal methods, and their morphology was characterized using scanning electron microscopy and energy-dispersive X-ray spectroscopy, while Fourier transform infrared spectroscopy confirmed the presence of functional groups. Electrochemical analysis of WS2, MXene, and MXene/WS2 was conducted in a 1 M H2SO4 electrolyte using cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electrochemical impedance spectroscopy (EIS). The specific capacitance (Cs) values for WS2 were 58 F/g (at 5 mV/s) and 47 F/g (at 0.4 A/g); for MXene, the Cs values were 98 F/g (at 5 mV/s) and 71 F/g (at 0.4 A/g), while MXene/WS2 exhibited much higher Cs values of 322 F/g (at 5 mV/s) and 373 F/g (at 0.4 A/g). EIS results indicated a lower charge transfer resistance (Rct) for MXene/WS2 (2.29 Ω) compared to WS2 (5.25 Ω) and MXene (3.41 Ω). These findings demonstrate that MXene/WS2 nanocomposites have superior electrochemical properties, making them promising candidates for high-energy supercapacitor applications.
{"title":"Synthesis and characterization of a nanocomposite consisting of Ti3C2Tx (MXene) and WS2 nanosheets for potential use in supercapacitors","authors":"Pınar Talay Pınar, Mehmet Gülcan, Yavuz Yardım","doi":"10.1016/j.jallcom.2024.177656","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177656","url":null,"abstract":"With the growing demand for high-performance supercapacitor materials, this study explores the synthesis and electrochemical evaluation of Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> (MXene), WS<sub>2</sub> nanosheets, and MXene/WS<sub>2</sub> nanocomposites. The aim is to develop materials with enhanced energy storage capabilities. To this end, the performance of MXene/WS2 nanocomposites was compared to that of the individual materials. MXene, WS<sub>2</sub> nanosheets, and MXene/WS<sub>2</sub> nanocomposites were synthesized through chemical and hydrothermal methods, and their morphology was characterized using scanning electron microscopy and energy-dispersive X-ray spectroscopy, while Fourier transform infrared spectroscopy confirmed the presence of functional groups. Electrochemical analysis of WS<sub>2</sub>, MXene, and MXene/WS<sub>2</sub> was conducted in a 1<!-- --> <!-- -->M H<sub>2</sub>SO<sub>4</sub> electrolyte using cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electrochemical impedance spectroscopy (EIS). The specific capacitance (C<sub>s</sub>) values for WS<sub>2</sub> were 58<!-- --> <!-- -->F/g (at 5<!-- --> <!-- -->mV/s) and 47<!-- --> <!-- -->F/g (at 0.4<!-- --> <!-- -->A/g); for MXene, the C<sub>s</sub> values were 98<!-- --> <!-- -->F/g (at 5<!-- --> <!-- -->mV/s) and 71<!-- --> <!-- -->F/g (at 0.4<!-- --> <!-- -->A/g), while MXene/WS<sub>2</sub> exhibited much higher C<sub>s</sub> values of 322<!-- --> <!-- -->F/g (at 5<!-- --> <!-- -->mV/s) and 373<!-- --> <!-- -->F/g (at 0.4<!-- --> <!-- -->A/g). EIS results indicated a lower charge transfer resistance (R<sub>ct</sub>) for MXene/WS<sub>2</sub> (2.29 Ω) compared to WS<sub>2</sub> (5.25 Ω) and MXene (3.41 Ω). These findings demonstrate that MXene/WS<sub>2</sub> nanocomposites have superior electrochemical properties, making them promising candidates for high-energy supercapacitor applications.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"35 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142670956","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this study, Ag/Cu@CuFe2O4 nanocomposites were prepared using hydrothermal method and sedimentation-precipitation method for the detection of TMA gas. The morphology, crystal structure and elemental composition of the materials were analyzed by XRD, SEM, EDS and XPS characterization, and the results showed that the Ag/Cu@CuFe2O4 composites were successfully synthesized. When the content of Ag was 10% by molar ratio, the Ag/Cu@CuFe2O4 (ACF-10) sensor exhibited optimal performance at a working temperature of 150 oC, showing the best response to TMA gas. The ACF-10 sensor had a response and recovery time of 8 s and 14 s for 20 ppm TMA, with a response value of 42.8%. The sensor also demonstrated excellent selectivity, repeatability, and enduring stability over the long-term. The presence of Ag and Cu increases the adsorption of TMA gas on the material's surface by promoting catalytic reactions with oxygen molecules. Additionally, the enhanced TMA gas sensing performance of the Ag/Cu@CuFe2O4 nanocomposite material was further elucidated through theoretical calculations based on first principles. The constructed TMA gas detection circuit can detect and display TMA gas concentration, enabling real-time TMA gas detection functionality.
{"title":"Trimethylamine gas sensor based on bimetallic Ag/Cu@CuFe2O4: Experiment and DFT calculation","authors":"Yuehang Sun, Dongzhi Zhang, Mingcong Tang, Wenzhe Liu, Yukun Liu, Jianghao Wang, Guangshuai Xi, Haotian Xiong, Lifa Zhang","doi":"10.1016/j.jallcom.2024.177662","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177662","url":null,"abstract":"In this study, Ag/Cu@CuFe<sub>2</sub>O<sub>4</sub> nanocomposites were prepared using hydrothermal method and sedimentation-precipitation method for the detection of TMA gas. The morphology, crystal structure and elemental composition of the materials were analyzed by XRD, SEM, EDS and XPS characterization, and the results showed that the Ag/Cu@CuFe<sub>2</sub>O<sub>4</sub> composites were successfully synthesized. When the content of Ag was 10% by molar ratio, the Ag/Cu@CuFe<sub>2</sub>O<sub>4</sub> (ACF-10) sensor exhibited optimal performance at a working temperature of 150<!-- --> <sup>o</sup>C, showing the best response to TMA gas. The ACF-10 sensor had a response and recovery time of 8<!-- --> <!-- -->s and 14<!-- --> <!-- -->s for 20 ppm TMA, with a response value of 42.8%. The sensor also demonstrated excellent selectivity, repeatability, and enduring stability over the long-term. The presence of Ag and Cu increases the adsorption of TMA gas on the material's surface by promoting catalytic reactions with oxygen molecules. Additionally, the enhanced TMA gas sensing performance of the Ag/Cu@CuFe<sub>2</sub>O<sub>4</sub> nanocomposite material was further elucidated through theoretical calculations based on first principles. The constructed TMA gas detection circuit can detect and display TMA gas concentration, enabling real-time TMA gas detection functionality.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"251 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142673396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-19DOI: 10.1016/j.jallcom.2024.177665
Shi Woo Lee, Sujung Son, Soon-Jik Hong, Hyoung Seop Kim
Incorporating light elements into refractory high-entropy alloys (RHEAs) has been extensively studied to reduce density while maintaining strength. The equiatomic MoV alloy, composed of common RHEA constituents, is promising for forming an isomorphous solid solution and avoiding brittle intermetallic compounds. This study investigates the effects of Al on the equiatomic MoV alloy by fabricating and analyzing MoV, Al15MoV, Al33MoV, and Al50MoV alloys. The crystal structures of MoV, Al15MoV, and Al33MoV were body-centered cubic, while secondary phases were observed in Al50MoV. The Al15MoV and Al33MoV alloys demonstrated higher yield strengths than MoV, despite the addition of soft Al. Notably, the Al15MoV alloy exhibited the best combination of strength and ductility among designed alloys, with a compressive strength of ~1273 MPa and a ductility of ~13%. The primary strengthening mechanism was solid solution strengthening, induced by the significant shear modulus misfit of Al atoms with Mo and V. These novel Al-Mo-V medium-entropy alloys represent a significant advancement in developing lighter RHEAs without compromising mechanical properties, offering a new direction for future RHEA design.
{"title":"Alloy design and microstructure of AlxMoV medium-entropy alloys","authors":"Shi Woo Lee, Sujung Son, Soon-Jik Hong, Hyoung Seop Kim","doi":"10.1016/j.jallcom.2024.177665","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177665","url":null,"abstract":"Incorporating light elements into refractory high-entropy alloys (RHEAs) has been extensively studied to reduce density while maintaining strength. The equiatomic MoV alloy, composed of common RHEA constituents, is promising for forming an isomorphous solid solution and avoiding brittle intermetallic compounds. This study investigates the effects of Al on the equiatomic MoV alloy by fabricating and analyzing MoV, Al<sub>15</sub>MoV, Al<sub>33</sub>MoV, and Al<sub>50</sub>MoV alloys. The crystal structures of MoV, Al<sub>15</sub>MoV, and Al<sub>33</sub>MoV were body-centered cubic, while secondary phases were observed in Al<sub>50</sub>MoV. The Al<sub>15</sub>MoV and Al<sub>33</sub>MoV alloys demonstrated higher yield strengths than MoV, despite the addition of soft Al. Notably, the Al<sub>15</sub>MoV alloy exhibited the best combination of strength and ductility among designed alloys, with a compressive strength of ~1273<!-- --> <!-- -->MPa and a ductility of ~13%. The primary strengthening mechanism was solid solution strengthening, induced by the significant shear modulus misfit of Al atoms with Mo and V. These novel Al-Mo-V medium-entropy alloys represent a significant advancement in developing lighter RHEAs without compromising mechanical properties, offering a new direction for future RHEA design.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"13 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142673393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-19DOI: 10.1016/j.jallcom.2024.177643
Jiaqi Yu, Ke Li, Zhenghui Tian, Yang Qu, Lingrong Meng, Guofeng Wang
Upconversion luminescence (UCL) is a nonlinear optical phenomenon where long wavelength radiation is converted to shorter wavelength via a two-photon or multi-photon mechanism. The construction of near-infrared nonlinear WLEDs can achieve effective utilization of sunlight. This work starts with "functional Motifs" and regulates the nonlinear luminescent materials at the molecular level by combining DFT calculations and high-throughput techniques. As expected, the optimized geometric structures, band structures, and density of states of Ba2YbF7:Ln3+ were successfully obtained by assembling [BaBr4] and [LnBr4] functional Motifs. Subsequently, Ba2YbF7:Ln3+ single phosphor was prepared and further encapsulated into resin to achieve highly stable upconversion white light using 3D printing technology. After being placed for 8 months, the luminescence intensity and spectral shape of the resin coated sample remain unchanged. The color coordinates of the WLED device constructed with Ba2YbF7:Tm3+/Er3+ single fluorescent powder is (0.3086, 0.3163) and the related color temperature (CCT) is 6863 K. The optimized material has a maximum color rendering index of 83. This work provides new insights and ideas for improving the luminescence stability of upconversion WLED using 3D printing technology.
{"title":"Near-infrared nonlinear WLEDs with high stability through atomic-level regulation and photosensitive resin encapsulating by 3D printing","authors":"Jiaqi Yu, Ke Li, Zhenghui Tian, Yang Qu, Lingrong Meng, Guofeng Wang","doi":"10.1016/j.jallcom.2024.177643","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177643","url":null,"abstract":"Upconversion luminescence (UCL) is a nonlinear optical phenomenon where long wavelength radiation is converted to shorter wavelength via a two-photon or multi-photon mechanism. The construction of near-infrared nonlinear WLEDs can achieve effective utilization of sunlight. This work starts with \"functional Motifs\" and regulates the nonlinear luminescent materials at the molecular level by combining DFT calculations and high-throughput techniques. As expected, the optimized geometric structures, band structures, and density of states of Ba<sub>2</sub>YbF<sub>7</sub>:Ln<sup>3+</sup> were successfully obtained by assembling [BaBr<sub>4</sub>] and [LnBr<sub>4</sub>] functional Motifs. Subsequently, Ba<sub>2</sub>YbF<sub>7</sub>:Ln<sup>3+</sup> single phosphor was prepared and further encapsulated into resin to achieve highly stable upconversion white light using 3D printing technology. After being placed for 8 months, the luminescence intensity and spectral shape of the resin coated sample remain unchanged. The color coordinates of the WLED device constructed with Ba<sub>2</sub>YbF<sub>7</sub>:Tm<sup>3+</sup>/Er<sup>3+</sup> single fluorescent powder is (0.3086, 0.3163) and the related color temperature (CCT) is 6863<!-- --> <!-- -->K. The optimized material has a maximum color rendering index of 83. This work provides new insights and ideas for improving the luminescence stability of upconversion WLED using 3D printing technology.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"197 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142670903","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-19DOI: 10.1016/j.jallcom.2024.177653
Qian Zhang, Guoming Li, Zhu Ma, Yi Chen, Zhuowei Du, Wei You, Junbo Yang, Yixian Li, Hao Du, Zhuo Lv, Dengqian Xiang, Bo Chen, Hong Yu, Maozhu Mao, Cheng Huang, Yan Xiang, Jian Yu, Yaohua Mai, Kuan Sun, Ningqiang Xuan, Kai Yue
SnO2 stands as a prominently employed material as electron transport layer (ETL) for perovskite solar cells (PSCs). Nevertheless, SnO2 films prepared at low temperatures are accompanied by defects that will influent the transport of carriers at the interface, misalignment of energy levels, and the quality of thin perovskite film formation. Here, we introduce 4-aminobenzoic acid ethyl ester (4-AN), characterized by its carbonyl (C=O) and amino (-NH2) groups, as a synergistic defect passivation agent on the surfaces of SnO2 and perovskite films. This approach aims to enhance the electron transport properties of SnO2. By optimizing the energy alignment between SnO2 and perovskite, 4-AN facilitates more efficient extraction of interfacial carriers, while also promoting the crystalline quality of perovskite films and suppressing carrier recombination at the interface. The long alkyl chains at the end play an important role in relieving the interfacial contact and help to enhance the SnO2/perovskite interfacial connection. Compared with pristine SnO2, the PSCs based on 4-AN modified SnO2 obtained an optimal efficiency of 21.83%, while the devices maintained 90% and 83% of their initial PCE after storage for 1000 h in an N2 environment and humidity of 30-50%. This work provides valid insights for the development of novel interface modification materials.
{"title":"Multifunctional organic molecule with synergistic modified SnO2 for efficient perovskite solar cells","authors":"Qian Zhang, Guoming Li, Zhu Ma, Yi Chen, Zhuowei Du, Wei You, Junbo Yang, Yixian Li, Hao Du, Zhuo Lv, Dengqian Xiang, Bo Chen, Hong Yu, Maozhu Mao, Cheng Huang, Yan Xiang, Jian Yu, Yaohua Mai, Kuan Sun, Ningqiang Xuan, Kai Yue","doi":"10.1016/j.jallcom.2024.177653","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177653","url":null,"abstract":"SnO<sub>2</sub> stands as a prominently employed material as electron transport layer (ETL) for perovskite solar cells (PSCs). Nevertheless, SnO<sub>2</sub> films prepared at low temperatures are accompanied by defects that will influent the transport of carriers at the interface, misalignment of energy levels, and the quality of thin perovskite film formation. Here, we introduce 4-aminobenzoic acid ethyl ester (4-AN), characterized by its carbonyl (C=O) and amino (-NH<sub>2</sub>) groups, as a synergistic defect passivation agent on the surfaces of SnO<sub>2</sub> and perovskite films. This approach aims to enhance the electron transport properties of SnO<sub>2</sub>. By optimizing the energy alignment between SnO<sub>2</sub> and perovskite, 4-AN facilitates more efficient extraction of interfacial carriers, while also promoting the crystalline quality of perovskite films and suppressing carrier recombination at the interface. The long alkyl chains at the end play an important role in relieving the interfacial contact and help to enhance the SnO<sub>2</sub>/perovskite interfacial connection. Compared with pristine SnO<sub>2</sub>, the PSCs based on 4-AN modified SnO<sub>2</sub> obtained an optimal efficiency of 21.83%, while the devices maintained 90% and 83% of their initial PCE after storage for 1000<!-- --> <!-- -->h in an N<sub>2</sub> environment and humidity of 30-50%. This work provides valid insights for the development of novel interface modification materials.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"11 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142671003","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Implementing a stable interfacial architecture with augmented conductivity emerges as a pivotal approach for bolstering the stability of LiNi0.5Co0.2Mn0.3O2 (NCM523) and facilitating expedited Li+ transport. To augment efficiency and foster compatibility with industrial processes, a novel one-step, high-temperature modification technique is introduced for the fabrication of a dual-layer LiCoO2 & Li3BO3 (LCO/LBO) coating on the NCM523. This is achieved through the utilization of nano-CoB particles (nCoB) as a medium to capture LiOH impurities. The special coating architecture not only propels Li+ diffusion at the interphase but also mitigates acid-induced corrosion, thereby preserving the structural integrity of cathode material throughout its operational lifecycle. Owing to this innovative coating, the electrochemical attributes of NCM523 witness significant improvement, demonstrated by a remarkable 98.2% capacity retention following 100 cycles at 1 C, and a sustained 75.9% capacity retention after 300 cycles, a stark contrast to the 29.2% observed with uncoated NCM523. This investigation validates the LCO/LBO coating paradigm as a means to synergistically enhance Li+ translocation across the electrical double layer while countering cathodic structural erosion, offering fresh perspectives in the domain of NCM523 cathode surface enhancement.
{"title":"Surface engineering with bifunctional layer in LiNi0.5Co0.2Mn0.3O2 for high-performance cathode materials of lithium-ion batteries","authors":"Yinghao Zhao, Pongsakorn Kantichaimongkol, Chengwu Yang, Zhiqiang Dai, Dong Xu, Xueqing Zhang, Manunya Okhawilai, Prasit Pattananuwat, Xinyu Zhang, Jiaqian Qin","doi":"10.1016/j.jallcom.2024.177661","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177661","url":null,"abstract":"Implementing a stable interfacial architecture with augmented conductivity emerges as a pivotal approach for bolstering the stability of LiNi<sub>0.5</sub>Co<sub>0.2</sub>Mn<sub>0.3</sub>O<sub>2</sub> (NCM523) and facilitating expedited Li<sup>+</sup> transport. To augment efficiency and foster compatibility with industrial processes, a novel one-step, high-temperature modification technique is introduced for the fabrication of a dual-layer LiCoO<sub>2</sub> & Li<sub>3</sub>BO<sub>3</sub> (LCO/LBO) coating on the NCM523. This is achieved through the utilization of nano-CoB particles (nCoB) as a medium to capture LiOH impurities. The special coating architecture not only propels Li<sup>+</sup> diffusion at the interphase but also mitigates acid-induced corrosion, thereby preserving the structural integrity of cathode material throughout its operational lifecycle. Owing to this innovative coating, the electrochemical attributes of NCM523 witness significant improvement, demonstrated by a remarkable 98.2% capacity retention following 100 cycles at 1<!-- --> <!-- -->C, and a sustained 75.9% capacity retention after 300 cycles, a stark contrast to the 29.2% observed with uncoated NCM523. This investigation validates the LCO/LBO coating paradigm as a means to synergistically enhance Li<sup>+</sup> translocation across the electrical double layer while countering cathodic structural erosion, offering fresh perspectives in the domain of NCM523 cathode surface enhancement.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"99 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142670952","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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