Pub Date : 2024-11-01DOI: 10.1016/j.jmst.2024.10.009
Decang Zhang, Xiaoxin Zhang, Jun Zhang, Hao Ren, Zhonghui Liao, Xian Zeng, Qingzhi Yan
This work investigated the original microstructure of cold-worked alumina-forming austenitic steel, along with its precipitation and dissolution corrosion behaviors in lead-bismuth eutectic with 10-8 wt.% oxygen at 600°C, using solution-annealed steel for comparison. Anomalously, cold-worked steel presented milder corrosion compared to solution-annealed steel, with average corrosion depths of 314.3 and 401.0 μm after 1700 h exposure. Cold working-induced de-twinning transformed the annealing twin boundaries into normal high-angle grain boundaries (NGBs), increasing NGBs proportion from 36% to 89%. The increased NGBs provided more nucleation sites for intergranular barriers composed of alternate NiAl and M23C6 precipitates, thus better obstructing the dissolution attack.
{"title":"Synergistic inhibition to dissolution corrosion by de-twinning and precipitation in alumina-forming austenitic steel exposed to lead-bismuth eutectic with 10-8 wt.% oxygen at 600°C","authors":"Decang Zhang, Xiaoxin Zhang, Jun Zhang, Hao Ren, Zhonghui Liao, Xian Zeng, Qingzhi Yan","doi":"10.1016/j.jmst.2024.10.009","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.10.009","url":null,"abstract":"This work investigated the original microstructure of cold-worked alumina-forming austenitic steel, along with its precipitation and dissolution corrosion behaviors in lead-bismuth eutectic with 10<sup>-8</sup> wt.% oxygen at 600°C, using solution-annealed steel for comparison. Anomalously, cold-worked steel presented milder corrosion compared to solution-annealed steel, with average corrosion depths of 314.3 and 401.0 μm after 1700 h exposure. Cold working-induced de-twinning transformed the annealing twin boundaries into normal high-angle grain boundaries (NGBs), increasing NGBs proportion from 36% to 89%. The increased NGBs provided more nucleation sites for intergranular barriers composed of alternate NiAl and M<sub>23</sub>C<sub>6</sub> precipitates, thus better obstructing the dissolution attack.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":null,"pages":null},"PeriodicalIF":10.9,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142562218","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The growing demand for high-efficiency and low-loss energy conversion and transportation techniques urges the development of advanced Fe–Si based soft magnet alloys. Simultaneous achievement of low coercivity (Hc) and large saturation magnetization (Ms) however, remains challenging. In this study, soft magnetic alloys with the composition Fe82–xSi18Cox (x = 0 at.%, 4 at.%, 8 at.%, 12 at.%, 16 at.%, and 20 at.%) have been designed followed by microstructural tuning. The Co incorporation results in initially decreased Hc followed by increment due to reduced magnetocrystalline anisotropy and increased saturation magnetostriction from negative to positive values of the alloys. Meanwhile, the Ms raises with subsequent reduction, which origins from competitive mechanisms of increased average moment of Fe atoms and decreased average moment of Co atoms according to first principles calculations. Microstructural evolution during annealing of the Fe70Si18Co12 with synergistically optimized Hc and Ms has been revealed that after elevated-temperature annealing, the DO3 phase is predominately transformed from the B2 phase accompanied by an increase in the degree of ordering. The growth of the DO3 phase deteriorates the Hc due to the aggravating pinning effect on the domain wall movement, which arises from the inhomogeneous magnetization distribution caused by increasing antiphase boundaries.
对高效率、低损耗的能源转换和运输技术的需求日益增长，促使人们开发先进的铁硅基软磁合金。然而，同时实现低矫顽力（Hc）和大饱和磁化率（Ms）仍然具有挑战性。本研究设计了成分为 Fe82-xSi18Cox（x = 0 at.%、4 at.%、8 at.%、12 at.%、16 at.% 和 20 at.%）的软磁合金，并进行了微观结构调整。由于磁晶各向异性降低，合金的饱和磁致伸缩从负值变为正值，钴的加入导致 Hc 最初降低，随后升高。同时，Ms 随之降低而升高，根据第一性原理计算，这是由于铁原子的平均矩增加和钴原子的平均矩降低的竞争机制造成的。协同优化 Hc 和 Ms 的 Fe70Si18Co12 在退火过程中的微观结构演变表明，在高温退火后，DO3 相主要从 B2 相转变而来，同时有序化程度增加。DO3 相的增长会恶化 Hc，这是由于反相边界的增加导致磁化分布不均匀，从而加剧了对畴壁运动的钉扎效应。
{"title":"Composition and microstructure engineering of Fe–Si–Co soft magnetic alloys with enhanced performance","authors":"Qiming Chen, Kebing Wang, Lingfeng Wang, Jiaying Jin, Mi Yan, Chen Wu","doi":"10.1016/j.jmst.2024.08.069","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.08.069","url":null,"abstract":"The growing demand for high-efficiency and low-loss energy conversion and transportation techniques urges the development of advanced Fe–Si based soft magnet alloys. Simultaneous achievement of low coercivity (<em>H</em><sub>c</sub>) and large saturation magnetization (<em>M</em><sub>s</sub>) however, remains challenging. In this study, soft magnetic alloys with the composition Fe<sub>82–</sub><em><sub>x</sub></em>Si<sub>18</sub>Co<em><sub>x</sub></em> (<em>x</em> = 0 at.%, 4 at.%, 8 at.%, 12 at.%, 16 at.%, and 20 at.%) have been designed followed by microstructural tuning. The Co incorporation results in initially decreased <em>H</em><sub>c</sub> followed by increment due to reduced magnetocrystalline anisotropy and increased saturation magnetostriction from negative to positive values of the alloys. Meanwhile, the <em>M</em><sub>s</sub> raises with subsequent reduction, which origins from competitive mechanisms of increased average moment of Fe atoms and decreased average moment of Co atoms according to first principles calculations. Microstructural evolution during annealing of the Fe<sub>70</sub>Si<sub>18</sub>Co<sub>12</sub> with synergistically optimized <em>H</em><sub>c</sub> and <em>M</em><sub>s</sub> has been revealed that after elevated-temperature annealing, the DO<sub>3</sub> phase is predominately transformed from the B2 phase accompanied by an increase in the degree of ordering. The growth of the DO<sub>3</sub> phase deteriorates the <em>H</em><sub>c</sub> due to the aggravating pinning effect on the domain wall movement, which arises from the inhomogeneous magnetization distribution caused by increasing antiphase boundaries.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":null,"pages":null},"PeriodicalIF":10.9,"publicationDate":"2024-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142556228","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 : 2024-10-28DOI: 10.1016/j.jmst.2024.09.040
Xinhao Zhang, Xiaoxin Zhang, Jun Zhang, Xiaodong Huang, Qingzhi Yan
Heterogeneous lamellar structure materials have attracted extensive attention due to their exceptional strength and ductility. In this study, Y element was introduced into CuCrZr alloys to adjust the liquid phase formation temperature of the CuZrY phase during the solution annealing process. By employing cold rolling deformation prior to annealing to elongate the grains, the liquid phase was promoted to wet the elongated grain boundaries during the annealing process, ultimately forming lamellar CuZrY heterostructures distributed along the grain boundaries. The heterogeneous lamellar structure, the grain boundary distribution characteristics, and the effect of Y on stacking fault energy enhanced the hetero-deformation induced working hardening, thereby improving both the strength and ductility of the CuCrZrY alloy. Besides, the investigated CuCrZrY alloy achieved an excellent combination of tensile strength, uniform elongation, electrical conductivity and thermal conductivity, with values of 527 MPa, 10.66%, 83% IACS and 335.5 W/(m·K), respectively. Therefore, the method of controlling liquid phase temperature through composition adjustment and liquid phase infiltration path through grain deformation offers new possibilities for the design of heterogeneous lamellar structure materials.
{"title":"Enhancing strength and ductility of CuCrZr high-conductivity alloy via lamellar heterostructures on grain boundaries","authors":"Xinhao Zhang, Xiaoxin Zhang, Jun Zhang, Xiaodong Huang, Qingzhi Yan","doi":"10.1016/j.jmst.2024.09.040","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.09.040","url":null,"abstract":"Heterogeneous lamellar structure materials have attracted extensive attention due to their exceptional strength and ductility. In this study, Y element was introduced into CuCrZr alloys to adjust the liquid phase formation temperature of the CuZrY phase during the solution annealing process. By employing cold rolling deformation prior to annealing to elongate the grains, the liquid phase was promoted to wet the elongated grain boundaries during the annealing process, ultimately forming lamellar CuZrY heterostructures distributed along the grain boundaries. The heterogeneous lamellar structure, the grain boundary distribution characteristics, and the effect of Y on stacking fault energy enhanced the hetero-deformation induced working hardening, thereby improving both the strength and ductility of the CuCrZrY alloy. Besides, the investigated CuCrZrY alloy achieved an excellent combination of tensile strength, uniform elongation, electrical conductivity and thermal conductivity, with values of 527 MPa, 10.66%, 83% IACS and 335.5 W/(m·K), respectively. Therefore, the method of controlling liquid phase temperature through composition adjustment and liquid phase infiltration path through grain deformation offers new possibilities for the design of heterogeneous lamellar structure materials.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":null,"pages":null},"PeriodicalIF":10.9,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142519665","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Current research on green EMI shielding materials is often based on the misconception that absorption-dominated shielding is achieved when reflection loss (SER) exceeds absorption loss (SEA). Although this misconception has been corrected by a large body of literature, few studies have actually achieved absorbed power (A) greater than reflected power (R). In this study, PVA, glycerol and MXene were combined to form an organohydrogel (PMG) with oriented pores. The gel displays remarkable flexibility and strength, attributed to its robust network of hydrogen bond cross-links (the hysteresis return line remains stable under 1000 compression cycles). The PMG20-3 organohydrogel (0.78 wt% MXene) demonstrates a shielding performance of 42.34 dB (A/R=1.38) in the X-band and absorbs 99.9% of power in the terahertz band. This performance exceeds that of most previously reported systems and represents a new system for green electromagnetic shielding materials. Additionally, the PMG organohydrogel has flexible sensing and infrared stealth capabilities. These findings hold great promise for the development of green electromagnetic shielding multifunctional devices.
{"title":"New System for Green EMI shielding: Organohydrogel with Multi-band Green Electromagnetic Shielding, Sensing, and Infrared-Stealth Capacity","authors":"JiangYu Fang, Jian Xu, Peiyuan Zuo, Yukang Zhou, Chuanhao Tang, Jun Qian, Ruoqi Wang, Xiaoyun Liu, Qixin Zhuang","doi":"10.1016/j.jmst.2024.10.005","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.10.005","url":null,"abstract":"Current research on green EMI shielding materials is often based on the misconception that absorption-dominated shielding is achieved when reflection loss (SE<sub>R</sub>) exceeds absorption loss (SE<sub>A</sub>). Although this misconception has been corrected by a large body of literature, few studies have actually achieved absorbed power (A) greater than reflected power (R). In this study, PVA, glycerol and MXene were combined to form an organohydrogel (PMG) with oriented pores. The gel displays remarkable flexibility and strength, attributed to its robust network of hydrogen bond cross-links (the hysteresis return line remains stable under 1000 compression cycles). The PMG20-3 organohydrogel (0.78 wt% MXene) demonstrates a shielding performance of 42.34 dB (A/R=1.38) in the X-band and absorbs 99.9% of power in the terahertz band. This performance exceeds that of most previously reported systems and represents a new system for green electromagnetic shielding materials. Additionally, the PMG organohydrogel has flexible sensing and infrared stealth capabilities. These findings hold great promise for the development of green electromagnetic shielding multifunctional devices.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":null,"pages":null},"PeriodicalIF":10.9,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142519666","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 : 2024-10-28DOI: 10.1016/j.jmst.2024.10.007
Rong Fu, Zhiyuan Rui, Junping Du, Shihao Zhang, Fanshun Meng, Shigenobu Ogata
This paper investigates the temperature and loading rate dependencies of the critical stress intensity factor (KIC) for dislocation nucleation at crack tips. We develop a new KIC formula with a generalized form by incorporating the atomistic reaction pathway analysis into Transition State Theory (TST), which captures the KIC of the first dislocation nucleation event at crack tips and its sensitivity to temperature and loading rates. We use this formula and atomistic modeling information to specifically calculate the KIC for quasi-two-dimensional crack tips located at various slant twin boundaries in nano-twinned TiAl alloys across a wide range of temperatures and strain rates. Our findings reveal that twinning dislocation nucleation at the crack tip dominates crack propagation when twin boundaries (TBs) are tilted at 15.79° and 29.5°. Conversely, when TBs tilt at 45.29°, 54.74°, and 70.53°, dislocation slip becomes the preferred mode. Additionally, at TB tilts of 29.5° and 70.53°, at higher temperatures above 800 K and typical experimental loading rates, both dislocation nucleation modes can be activated with nearly equal probability. This observation is particularly significant as it highlights scenarios that molecular dynamics simulations, due to their time scale limitations, cannot adequately explore. This insight underscores the importance of analyzing temperature and loading rate dependencies of the KIC to fully understand the competing mechanisms of dislocation nucleation and their impact on material behavior.
{"title":"Temperature and loading-rate dependent critical stress intensity factor of dislocation nucleation from crack tip: Atomistic insights into cracking at slant twin boundaries in Nano-twinned TiAl alloys","authors":"Rong Fu, Zhiyuan Rui, Junping Du, Shihao Zhang, Fanshun Meng, Shigenobu Ogata","doi":"10.1016/j.jmst.2024.10.007","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.10.007","url":null,"abstract":"This paper investigates the temperature and loading rate dependencies of the critical stress intensity factor (<em>K</em><sub>IC</sub>) for dislocation nucleation at crack tips. We develop a new <em>K</em><sub>IC</sub> formula with a generalized form by incorporating the atomistic reaction pathway analysis into Transition State Theory (TST), which captures the <em>K</em><sub>IC</sub> of the first dislocation nucleation event at crack tips and its sensitivity to temperature and loading rates. We use this formula and atomistic modeling information to specifically calculate the <em>K</em><sub>IC</sub> for quasi-two-dimensional crack tips located at various slant twin boundaries in nano-twinned TiAl alloys across a wide range of temperatures and strain rates. Our findings reveal that twinning dislocation nucleation at the crack tip dominates crack propagation when twin boundaries (TBs) are tilted at 15.79° and 29.5°. Conversely, when TBs tilt at 45.29°, 54.74°, and 70.53°, dislocation slip becomes the preferred mode. Additionally, at TB tilts of 29.5° and 70.53°, at higher temperatures above 800 K and typical experimental loading rates, both dislocation nucleation modes can be activated with nearly equal probability. This observation is particularly significant as it highlights scenarios that molecular dynamics simulations, due to their time scale limitations, cannot adequately explore. This insight underscores the importance of analyzing temperature and loading rate dependencies of the <em>K</em><sub>IC</sub> to fully understand the competing mechanisms of dislocation nucleation and their impact on material behavior.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":null,"pages":null},"PeriodicalIF":10.9,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142519508","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 : 2024-10-24DOI: 10.1016/j.jmst.2024.09.043
Yue Du, Zhiyi Zhong, Lina Zhou, Wenxue Chen, Zhixian Shi, Pan Song, Yifeng Liu, Yao Yao, Yisi Liu, Shixue Dou, Yao Xiao
Developing nonprecious electrocatalysts with bifunctional performances for oxygen reduction (ORR) and evolution reactions (OER) remains a crucial challenge in rechargeable Zn-air batteries (RZABs). In this study, we report the synthesis of a three-dimensional (3D) porous N, P-doped carbon-wrapped cobalt phosphide composite (Co2P@3DNPC) via direct calcination of a novel organic/inorganic porous coordination polymer by an in-situ phosphating strategy. DFT calculations demonstrate the intricate interactions occurring during the PEI-directed grinding self-assembly process among Co2+, phytic acid (PA), and polyethylenimine (PEI). Specifically, Co2+ ions initially adsorb onto PEI molecules before integrating with PA to form a 3D coordination polymer matrix. As-fabricated Co2P@3DNPC composite exhibits impressive ORR/OER bifunctional performances, with a half-wave potential of 0.78 V and an overpotential of 1.71 V, respectively. Its bifunctional activities enable a power density of 148.5 mW cm–2 in rechargeable ZABs, with remarkable stability (> 480 h) during a discharge-charge cycle. The interconnected porous structure and embedded Co2P nanoparticles optimize the electrode-electrolyte interfacial contact, boosting energy density and cycle life of as-assembled ZABs. This innovative approach paves the way for efficient, cost-effective production of bifunctional electrocatalysts for RZABs.
{"title":"Coordination polymer derived transition metal phosphide/carbon composites for bifunctional oxygen electrocatalyst","authors":"Yue Du, Zhiyi Zhong, Lina Zhou, Wenxue Chen, Zhixian Shi, Pan Song, Yifeng Liu, Yao Yao, Yisi Liu, Shixue Dou, Yao Xiao","doi":"10.1016/j.jmst.2024.09.043","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.09.043","url":null,"abstract":"Developing nonprecious electrocatalysts with bifunctional performances for oxygen reduction (ORR) and evolution reactions (OER) remains a crucial challenge in rechargeable Zn-air batteries (RZABs). In this study, we report the synthesis of a three-dimensional (3D) porous N, P-doped carbon-wrapped cobalt phosphide composite (Co<sub>2</sub>P@3DNPC) via direct calcination of a novel organic/inorganic porous coordination polymer by an <em>in-situ</em> phosphating strategy. DFT calculations demonstrate the intricate interactions occurring during the PEI-directed grinding self-assembly process among Co<sup>2+</sup>, phytic acid (PA), and polyethylenimine (PEI). Specifically, Co<sup>2+</sup> ions initially adsorb onto PEI molecules before integrating with PA to form a 3D coordination polymer matrix. As-fabricated Co<sub>2</sub>P@3DNPC composite exhibits impressive ORR/OER bifunctional performances, with a half-wave potential of 0.78 V and an overpotential of 1.71 V, respectively. Its bifunctional activities enable a power density of 148.5 mW cm<sup>–2</sup> in rechargeable ZABs, with remarkable stability (> 480 h) during a discharge-charge cycle. The interconnected porous structure and embedded Co<sub>2</sub>P nanoparticles optimize the electrode-electrolyte interfacial contact, boosting energy density and cycle life of as-assembled ZABs. This innovative approach paves the way for efficient, cost-effective production of bifunctional electrocatalysts for RZABs.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":null,"pages":null},"PeriodicalIF":10.9,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142488646","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 : 2024-10-24DOI: 10.1016/j.jmst.2024.10.004
Mengyao Xu, Fei Liu, Shike Liu, Jun Ma, Mengqin Yao, Xiaodan Wang, Jianxin Cao
Metal-based catalysts are prevalent in the CO2 hydrogenation to methanol owing to their remarkable catalytic activity. Herein, Ru/In2O3 catalysts with different morphologies obtained by doping Ru into In2O3 with irregular, rod-like, and flower-like morphologies are used for catalytic CO2 hydrogenation to methanol. Results indicate that the flower-like Ru/In2O3 (Ru/In2O3-F) exhibits higher catalytic performance than Ru/In2O3 with other morphologies, achieving a 12.9% CO2 conversion, 74.02% methanol selectivity, and 671.36 mgMeOH·h−1·gcat−1 methanol spatiotemporal yield. Furthermore, Ru/In2O3-F maintains its catalytic stability over 200 h at 5 MPa and 290 °C. The promotional effect mainly stems from the fact that electronic structure of Ru can be effectively adjusted by modulating the morphology of In2O3. The strong interaction between atomically dispersed Ru and In2O3-F enhances the structural stability of Ru, inhibiting the agglomeration of the catalyst during the reaction process. Furthermore, density-functional theory calculations reveal that highly dispersed Ru atoms not only perform efficient and rapid electronic gain and loss processes, facilitating the catalytic activation of H2 into H intermediates. It also enables the generated reactive H to rapidly overflow to the surrounding In sites to participate in CO2 reduction. These findings provide a theoretical basis for the development of high-performance catalysts for CO2 hydrogenation.
由于金属基催化剂具有显著的催化活性，因此在二氧化碳加氢制甲醇的过程中非常普遍。本文采用在 In2O3 中掺杂 Ru 而得到的不同形态的 Ru/In2O3 催化剂，包括不规则形态、棒状形态和花状形态的 Ru/In2O3 催化剂，用于催化 CO2 加氢制甲醇。结果表明，与其他形态的 Ru/In2O3 相比，花状 Ru/In2O3 （Ru/In2O3-F）具有更高的催化性能，可实现 12.9% 的 CO2 转化率、74.02% 的甲醇选择性和 671.36 mgMeOH-h-1-gcat-1 的甲醇时空产率。此外，Ru/In2O3-F 还能在 5 兆帕、290 ℃ 的条件下保持 200 小时的催化稳定性。这种促进作用主要源于通过调节 In2O3 的形态可以有效调整 Ru 的电子结构。原子分散的 Ru 与 In2O3-F 之间的强相互作用增强了 Ru 的结构稳定性，抑制了催化剂在反应过程中的团聚。此外，密度泛函理论计算显示，高度分散的 Ru 原子不仅能执行高效快速的电子增益和损耗过程，促进 H2 被催化活化为 H 中间产物。它还能使生成的活性 H 快速溢出到周围的 In 位点，参与 CO2 还原。这些发现为开发用于 CO2 加氢的高性能催化剂提供了理论基础。
{"title":"Atomically dispersed Ru on flower-like In2O3 to boost CO2 hydrogenation to methanol","authors":"Mengyao Xu, Fei Liu, Shike Liu, Jun Ma, Mengqin Yao, Xiaodan Wang, Jianxin Cao","doi":"10.1016/j.jmst.2024.10.004","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.10.004","url":null,"abstract":"Metal-based catalysts are prevalent in the CO<sub>2</sub> hydrogenation to methanol owing to their remarkable catalytic activity. Herein, Ru/In<sub>2</sub>O<sub>3</sub> catalysts with different morphologies obtained by doping Ru into In<sub>2</sub>O<sub>3</sub> with irregular, rod-like, and flower-like morphologies are used for catalytic CO<sub>2</sub> hydrogenation to methanol. Results indicate that the flower-like Ru/In<sub>2</sub>O<sub>3</sub> (Ru/In<sub>2</sub>O<sub>3</sub>-F) exhibits higher catalytic performance than Ru/In<sub>2</sub>O<sub>3</sub> with other morphologies, achieving a 12.9% CO<sub>2</sub> conversion, 74.02% methanol selectivity, and 671.36 mg<sub>MeOH</sub>·h<sup>−1</sup>·g<sub>cat</sub><sup>−1</sup> methanol spatiotemporal yield. Furthermore, Ru/In<sub>2</sub>O<sub>3</sub>-F maintains its catalytic stability over 200 h at 5 MPa and 290 °C. The promotional effect mainly stems from the fact that electronic structure of Ru can be effectively adjusted by modulating the morphology of In<sub>2</sub>O<sub>3</sub>. The strong interaction between atomically dispersed Ru and In<sub>2</sub>O<sub>3</sub>-F enhances the structural stability of Ru, inhibiting the agglomeration of the catalyst during the reaction process. Furthermore, density-functional theory calculations reveal that highly dispersed Ru atoms not only perform efficient and rapid electronic gain and loss processes, facilitating the catalytic activation of H<sub>2</sub> into H intermediates. It also enables the generated reactive H to rapidly overflow to the surrounding In sites to participate in CO<sub>2</sub> reduction. These findings provide a theoretical basis for the development of high-performance catalysts for CO<sub>2</sub> hydrogenation.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":null,"pages":null},"PeriodicalIF":10.9,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142489188","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 : 2024-10-24DOI: 10.1016/j.jmst.2024.10.006
Gui Yang, Xiaoyuan Zhang, Jingzhan Zhu, Zichao Li, Duo Pan, Fengmei Su, Youxin Ji, Chuntai Liu, Changyu Shen
Stretchable conductive fibers are essential for the advancement of wearable electronic textiles. However, a significant challenge arises as their conductivity sharply decreases when stretched due to disruptions in electronic transport. Coating fibers with soft liquid metal (LM) has emerged as a promising solution. Despite this, there remains an urgent need to develop methods that enhance LM adhesion to substrates while facilitating efficient electron transport pathways. This study demonstrates a novel Ag-LM conductive network strategy for fabricating a thermoplastic polyurethane/polydopamine/silver-LM (TPU/PDA/Ag-LM) fiber membrane. This membrane exhibits outstanding stretchable electromagnetic interference (EMI) shielding performance and is produced through straightforward electrospinning, electroless depositing, and LM coating and activation. The TPU/PDA/Ag fiber membrane is initially prepared via polydopamine-assisted deposition of silver nanoparticles (AgNPs) on electrospun TPU fibers. The presence of AgNPs on the surface of TPU/PDA fibers enhances LM adhesion to the substrate and bridges adjacent LM to establish efficient conductive paths. This interaction benefits from the reactive alloying between AgNPs and LM, where the LM infiltrates the gaps among AgNPs, forming a distinctive LM-Ag alloy layer that uniformly coats the surface of TPU fibers. As anticipated, the unique three-dimensional (3D) interconnected LM-Ag conductive network remains intact during stretching, ensuring strain-invariant conductivity. The fabricated TPU/PDA/Ag-LM fiber membrane demonstrates exceptional EMI shielding effectiveness (SE) of 77.4 dB within the frequency range of 8.2–12.8 GHz and maintains an excellent EMI SE of 37.2 dB under extensive tensile deformation of 300%. Furthermore, the TPU/PDA/Ag-LM fiber membrane shows remarkable mechanical properties and stable Joule heating performance even under significant stretching.
{"title":"Silver nanoparticles bridging liquid metal for wearable electromagnetic interference fabric","authors":"Gui Yang, Xiaoyuan Zhang, Jingzhan Zhu, Zichao Li, Duo Pan, Fengmei Su, Youxin Ji, Chuntai Liu, Changyu Shen","doi":"10.1016/j.jmst.2024.10.006","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.10.006","url":null,"abstract":"Stretchable conductive fibers are essential for the advancement of wearable electronic textiles. However, a significant challenge arises as their conductivity sharply decreases when stretched due to disruptions in electronic transport. Coating fibers with soft liquid metal (LM) has emerged as a promising solution. Despite this, there remains an urgent need to develop methods that enhance LM adhesion to substrates while facilitating efficient electron transport pathways. This study demonstrates a novel Ag-LM conductive network strategy for fabricating a thermoplastic polyurethane/polydopamine/silver-LM (TPU/PDA/Ag-LM) fiber membrane. This membrane exhibits outstanding stretchable electromagnetic interference (EMI) shielding performance and is produced through straightforward electrospinning, electroless depositing, and LM coating and activation. The TPU/PDA/Ag fiber membrane is initially prepared via polydopamine-assisted deposition of silver nanoparticles (AgNPs) on electrospun TPU fibers. The presence of AgNPs on the surface of TPU/PDA fibers enhances LM adhesion to the substrate and bridges adjacent LM to establish efficient conductive paths. This interaction benefits from the reactive alloying between AgNPs and LM, where the LM infiltrates the gaps among AgNPs, forming a distinctive LM-Ag alloy layer that uniformly coats the surface of TPU fibers. As anticipated, the unique three-dimensional (3D) interconnected LM-Ag conductive network remains intact during stretching, ensuring strain-invariant conductivity. The fabricated TPU/PDA/Ag-LM fiber membrane demonstrates exceptional EMI shielding effectiveness (SE) of 77.4 dB within the frequency range of 8.2–12.8 GHz and maintains an excellent EMI SE of 37.2 dB under extensive tensile deformation of 300%. Furthermore, the TPU/PDA/Ag-LM fiber membrane shows remarkable mechanical properties and stable Joule heating performance even under significant stretching.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":null,"pages":null},"PeriodicalIF":10.9,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142488983","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 : 2024-10-24DOI: 10.1016/j.jmst.2024.09.041
Jiejun Ren, Longyun Liu, Fan Liu, Huiping Liu, Xiaopeng Zhou, Gen Li, Liangjun Chen, Guoping Yan, Yuhua Wang
Lead halide perovskite (LHP) nanocrystals (NCs) suffer from poor stability against environmental factors (heat, moisture, oxygen, etc.), which seriously hinders their practical application. Constructing a core-shell structure could be an effective approach to improve the stability and optical properties of the LHP NCs. Herein, a novel strategy of water-triggered phase transformation and phospholipid (DSPE) micelle encapsulation is proposed, generating highly luminescent water-dispersed CsPbBr3@CsPb2Br5@DSPE core-shell-shell nanocrystals. The epitaxial growth of the CsPb2Br5 shell is induced by the in-situ reconstruction of the CsPbBr3 surface by water erosion, and the lattice mismatch with the CsPbBr3 core is small (3.8%). The further amphipathic phospholipid encapsulation guarantees their excellent water dispersity and stability. Revealed by the femtosecond transient absorption spectroscopy, the dense CsPb2Br5@DSPE shell effectively passivates the surface of the CsPbBr3 core, thus improving its stability and luminescence performance. The resulting CsPbBr3@CsPb2Br5@DSPE nanoparticles exhibit excellent performance as fluorescent probes for bioimaging, aqueous inks for high-resolution pattering, and light conversion layers for LEDs, demonstrating their promising potential in multiple applications.
{"title":"Structural reconstruction synthesis of highly luminous water-stable CsPbBr3@CsPb2Br5@DSPE core-shell perovskite nanocrystals for bioimaging, pattering, and LEDs","authors":"Jiejun Ren, Longyun Liu, Fan Liu, Huiping Liu, Xiaopeng Zhou, Gen Li, Liangjun Chen, Guoping Yan, Yuhua Wang","doi":"10.1016/j.jmst.2024.09.041","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.09.041","url":null,"abstract":"Lead halide perovskite (LHP) nanocrystals (NCs) suffer from poor stability against environmental factors (heat, moisture, oxygen, etc.), which seriously hinders their practical application. Constructing a core-shell structure could be an effective approach to improve the stability and optical properties of the LHP NCs. Herein, a novel strategy of water-triggered phase transformation and phospholipid (DSPE) micelle encapsulation is proposed, generating highly luminescent water-dispersed CsPbBr<sub>3</sub>@CsPb<sub>2</sub>Br<sub>5</sub>@DSPE core-shell-shell nanocrystals. The epitaxial growth of the CsPb<sub>2</sub>Br<sub>5</sub> shell is induced by the in-situ reconstruction of the CsPbBr<sub>3</sub> surface by water erosion, and the lattice mismatch with the CsPbBr<sub>3</sub> core is small (3.8%). The further amphipathic phospholipid encapsulation guarantees their excellent water dispersity and stability. Revealed by the femtosecond transient absorption spectroscopy, the dense CsPb<sub>2</sub>Br<sub>5</sub>@DSPE shell effectively passivates the surface of the CsPbBr<sub>3</sub> core, thus improving its stability and luminescence performance. The resulting CsPbBr<sub>3</sub>@CsPb<sub>2</sub>Br<sub>5</sub>@DSPE nanoparticles exhibit excellent performance as fluorescent probes for bioimaging, aqueous inks for high-resolution pattering, and light conversion layers for LEDs, demonstrating their promising potential in multiple applications.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":null,"pages":null},"PeriodicalIF":10.9,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142488647","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Here, we architected a duplex heterostructure with FCC/L12 and B2 phases in Ni49Fe28Al17V6 eutectic high-entropy alloy (EHEA) by thermal-mechanical process. Ultra-high yield strength of ∼1550 MPa, high tensile strength of ∼1772 MPa and good ductility of ∼16.5% at room temperature (298 K) were exhibited. Particularly, ultra-high yield strength of ∼1877 MPa, ultra-high tensile strength of ∼2157 MPa and uniform elongation of ∼10% were achieved at cryogenic temperature (77 K). Such excellent room-temperature mechanical properties are attributed to the hetero-deformation induced (HDI) hardening. Ultrahigh cryogenic-temperature strength originates from not only HDI hardening, but also the strong interaction of deformation twins and high-density dislocations.
{"title":"Ultra-high strength and ductility of eutectic high-entropy alloy with duplex heterostructure at room and cryogenic temperatures","authors":"Xiangkui Liu, Jingying Liu, Chenglong Zhou, Weixia Dong, Xuecong Zhang, Qianye Wang, Huiqing Xu, Xulong An, Dandan Wang, Wei Wei, Zhenfei Jiang","doi":"10.1016/j.jmst.2024.10.008","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.10.008","url":null,"abstract":"Here, we architected a duplex heterostructure with FCC/L1<sub>2</sub> and B2 phases in Ni<sub>49</sub>Fe<sub>28</sub>Al<sub>17</sub>V<sub>6</sub> eutectic high-entropy alloy (EHEA) by thermal-mechanical process. Ultra-high yield strength of ∼1550 MPa, high tensile strength of ∼1772 MPa and good ductility of ∼16.5% at room temperature (298 K) were exhibited. Particularly, ultra-high yield strength of ∼1877 MPa, ultra-high tensile strength of ∼2157 MPa and uniform elongation of ∼10% were achieved at cryogenic temperature (77 K). Such excellent room-temperature mechanical properties are attributed to the hetero-deformation induced (HDI) hardening. Ultrahigh cryogenic-temperature strength originates from not only HDI hardening, but also the strong interaction of deformation twins and high-density dislocations.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":null,"pages":null},"PeriodicalIF":10.9,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142488609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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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