Pub Date : 2025-02-14DOI: 10.1016/j.jmst.2024.12.039
Xiaofeng Sun, Tao Xian, Chenyang Sun, Junqin Zhang, Guorong Liu, Hua Yang
Recently, the noble metal Au has been widely applied as the cocatalyst for improving the photocatalytic reduction of CO2. However, the metallic Au exhibits weak adsorption strength towards CO2 due to its intrinsic electronic structure with d-orbitals fully filled, thus limiting the activation and reduction of CO2. To address this issue and maximize the photoreduction of CO2, herein we have designed Au@CZS@MO-400 triple-shelled hollow nanospheres by depositing Cd0.7Zn0.3S (CZS) on the outer surface of the MO-400 (MnO2 annealed at 400°C) hollow nanospheres and then Au nanoparticles on the CZS surface. It is manifested that the resultant 3%Au@CZS@MO-400 achieves a remarkably boosted photoreduction of CO2 with the CO/CH4 yield rates as high as 68.25/12.42 μmol g-1 h-1, increased by 3.7/1.5 times over MO-400 and 12.9/1.5 times over CZS. The combined analyses from X-ray photoelectron spectroscopy and density functional theory calculations confirm the creation of electron-deficient Auδ+ active sites by modulating their electron configuration by CZS, consequently decreasing the CO2‒Au antibonding-orbital occupancy to reinforce the adsorption strength of CO2 onto the Au active sites and in turn boost the photoreduction of CO2. Moreover, it is demonstrated that the Au@CZS@MO-400 hollow nanospheres are quite efficient for supplying the Au cocatalyst with photoelectrons for CO2 reduction reactions due to the good energy band matching, unique hollow structure and high electron spin polarization of MO-400. This work provides important guidance for understanding and modifying photocatalysts to maximize their photoreduction of CO2.
{"title":"Enhancing CO2 photoreduction on Au@CdZnS@MnO2 hollow nanospheres via electron configuration modulation","authors":"Xiaofeng Sun, Tao Xian, Chenyang Sun, Junqin Zhang, Guorong Liu, Hua Yang","doi":"10.1016/j.jmst.2024.12.039","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.12.039","url":null,"abstract":"Recently, the noble metal Au has been widely applied as the cocatalyst for improving the photocatalytic reduction of CO<sub>2</sub>. However, the metallic Au exhibits weak adsorption strength towards CO<sub>2</sub> due to its intrinsic electronic structure with d-orbitals fully filled, thus limiting the activation and reduction of CO<sub>2</sub>. To address this issue and maximize the photoreduction of CO<sub>2</sub>, herein we have designed Au@CZS@MO-400 triple-shelled hollow nanospheres by depositing Cd<sub>0.7</sub>Zn<sub>0.3</sub>S (CZS) on the outer surface of the MO-400 (MnO<sub>2</sub> annealed at 400°C) hollow nanospheres and then Au nanoparticles on the CZS surface. It is manifested that the resultant 3%Au@CZS@MO-400 achieves a remarkably boosted photoreduction of CO<sub>2</sub> with the CO/CH<sub>4</sub> yield rates as high as 68.25/12.42 μmol g<sup>-1</sup> h<sup>-1</sup>, increased by 3.7/1.5 times over MO-400 and 12.9/1.5 times over CZS. The combined analyses from X-ray photoelectron spectroscopy and density functional theory calculations confirm the creation of electron-deficient Au<sup>δ+</sup> active sites by modulating their electron configuration by CZS, consequently decreasing the CO<sub>2</sub>‒Au antibonding-orbital occupancy to reinforce the adsorption strength of CO<sub>2</sub> onto the Au active sites and in turn boost the photoreduction of CO<sub>2</sub>. Moreover, it is demonstrated that the Au@CZS@MO-400 hollow nanospheres are quite efficient for supplying the Au cocatalyst with photoelectrons for CO<sub>2</sub> reduction reactions due to the good energy band matching, unique hollow structure and high electron spin polarization of MO-400. This work provides important guidance for understanding and modifying photocatalysts to maximize their photoreduction of CO<sub>2</sub>.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"3 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143418483","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}
Cooperative coupling of photocatalytic hydrogen peroxide production with organic pollutants degradation has an expansive perspective in energy storage and environmental conservation. Herein, an S-scheme heterojunction is constructed by hybridizing a 3D flower like Schiff-based covalent organic framework (COF) with a porous structure g-C3N4, and a comprehensive strategy is proposed to achieve efficient H2O2 production yield coupling highly Rhodamine B (RhB) degradation rate. The charge carrier transfer mechanism is validated by an in-situ X-ray photoelectron spectroscopy, the density functional theory calculation, and a femtosecond transient absorption spectroscopy. Interestingly, the COF/g-C3N4 S-scheme heterojunction exhibits better charge separation efficiency compared to bare COF and pure g-C3N4, resulting in ameliorative photocatalytic activity. In addition, RhB is employed to consume photogenerated holes. Remarkably, 2307 μmol g−1 h−1 H2O2 achieved over 10%-COF/g-C3N4 composite in RhB solution and O2 atmosphere, and 100%-RhB degradation rate obtained at 45 min. This work improves a facile strategy to ameliorate Schiff COF-based S-scheme heterojunction for efficient H2O2 production with full hole-electron utilization ability.
{"title":"Efficient H2O2 production coupling Rhodamine B degradation over covalent organic framework/g-C3N4 with S-scheme charge separation mechanism and fully hole-electron utilization ability","authors":"Yanyan Zhao, Yong Zhang, Libo Wang, Chenbin Ai, Jianjun Zhang","doi":"10.1016/j.jmst.2024.12.040","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.12.040","url":null,"abstract":"Cooperative coupling of photocatalytic hydrogen peroxide production with organic pollutants degradation has an expansive perspective in energy storage and environmental conservation. Herein, an S-scheme heterojunction is constructed by hybridizing a 3D flower like Schiff-based covalent organic framework (COF) with a porous structure g-C<sub>3</sub>N<sub>4</sub>, and a comprehensive strategy is proposed to achieve efficient H<sub>2</sub>O<sub>2</sub> production yield coupling highly Rhodamine B (RhB) degradation rate. The charge carrier transfer mechanism is validated by an in-situ X-ray photoelectron spectroscopy, the density functional theory calculation, and a femtosecond transient absorption spectroscopy. Interestingly, the COF/g-C<sub>3</sub>N<sub>4</sub> S-scheme heterojunction exhibits better charge separation efficiency compared to bare COF and pure g-C<sub>3</sub>N<sub>4</sub>, resulting in ameliorative photocatalytic activity. In addition, RhB is employed to consume photogenerated holes. Remarkably, 2307 μmol g<sup>−1</sup> h<sup>−1</sup> H<sub>2</sub>O<sub>2</sub> achieved over 10%-COF/g-C<sub>3</sub>N<sub>4</sub> composite in RhB solution and O<sub>2</sub> atmosphere, and 100%-RhB degradation rate obtained at 45 min. This work improves a facile strategy to ameliorate Schiff COF-based S-scheme heterojunction for efficient H<sub>2</sub>O<sub>2</sub> production with full hole-electron utilization ability.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"15 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143417225","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}
In the face of the increasingly serious electromagnetic wave (EMW) pollution, a component modulation strategy is proposed in this study. By integrating ZIF-67 and FeOOH into MXene nanosheets and performing heat treatment, a multiphase heterogeneous structure based on the multicomponent synergistic effect was successfully constructed. The synergistic effect of dielectric loss and magnetic loss is realized, and the rich heterogeneous interface and multi-scale structure significantly enhance the interface polarization and multiple scattering. The results show that the EMW absorption performance can be optimized by adjusting the composition of the composites. MXene@CoFe2O4 exhibits a minimum reflection loss (RLmin) of −44.98 dB at 2.3 mm thickness and a maximum effective absorption bandwidth (EABmax) of 4.64 GHz at 2.1 mm. MXene@CoFe2O4/CoFe composite has an RLmin of −55.14 dB at a thickness of 2.1 mm and an EABmax of 5.60 GHz at a thickness of 1.9 mm. This work provides important insights into the development of wideband EMW absorbent materials.
{"title":"Component modulation strategy to construct multi-heterogeneous interfaces to promote interfacial polarization for efficient electromagnetic wave absorption","authors":"Ailing Feng, Liyuan Yu, Di Lan, Changpeng Lv, Siyuan Zhang, Zhenguo Gao, Zhiqiang Guo, Guanglei Wu","doi":"10.1016/j.jmst.2025.02.001","DOIUrl":"https://doi.org/10.1016/j.jmst.2025.02.001","url":null,"abstract":"In the face of the increasingly serious electromagnetic wave (EMW) pollution, a component modulation strategy is proposed in this study. By integrating ZIF-67 and FeOOH into MXene nanosheets and performing heat treatment, a multiphase heterogeneous structure based on the multicomponent synergistic effect was successfully constructed. The synergistic effect of dielectric loss and magnetic loss is realized, and the rich heterogeneous interface and multi-scale structure significantly enhance the interface polarization and multiple scattering. The results show that the EMW absorption performance can be optimized by adjusting the composition of the composites. MXene@CoFe<sub>2</sub>O<sub>4</sub> exhibits a minimum reflection loss (RL<sub>min</sub>) of −44.98 dB at 2.3 mm thickness and a maximum effective absorption bandwidth (EAB<sub>max</sub>) of 4.64 GHz at 2.1 mm. MXene@CoFe<sub>2</sub>O<sub>4</sub>/CoFe composite has an RL<sub>min</sub> of −55.14 dB at a thickness of 2.1 mm and an EAB<sub>max</sub> of 5.60 GHz at a thickness of 1.9 mm. This work provides important insights into the development of wideband EMW absorbent materials.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"11 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143418487","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 : 2025-02-13DOI: 10.1016/j.jmst.2024.12.038
Ziyi Liu, Yu Zhang, Hong Liu, Houwen Chen, Liming Peng
Magnesium alloys, the lightest metallic materials for structural applications, have met the bottleneck in the applications at 300°C due to limited creep resistance. The degradation of creep resistance closely depends on the microstructural deterioration, especially the formation of precipitate-free zones (PFZs), but the detailed evolution process remains unclear in this regard. The present study adopted a quasi-in-situ methodology to track the evolution process of the PFZs in Mg-2.5Gd-0.1Zr (at.%) alloy during creep at 300°C under 60 MPa. In the early creep stage, the widening of PFZs and phase transformation of intragranular precipitates are repressed by the applied stress. In the steady and accelerated creep stages, propagation of dislocations generates misorientation between PFZs and their parent grains, leading to the formation of Type-A PFZs. Meanwhile, vacancy diffusion leads to inverse migration of grain boundaries, and produces PFZs with serrated grain boundaries between split rows of grain boundary particles, causing the formation of Type-B PFZs. Secondary intergranular cracks tend to develop in Type-B PFZs in the accelerated creep stage, but the strain accumulation in Type-A PFZs is the key contributor to premature creep failure.
{"title":"Evolution process of precipitate-free zones in a Mg-Gd alloy during creep","authors":"Ziyi Liu, Yu Zhang, Hong Liu, Houwen Chen, Liming Peng","doi":"10.1016/j.jmst.2024.12.038","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.12.038","url":null,"abstract":"Magnesium alloys, the lightest metallic materials for structural applications, have met the bottleneck in the applications at 300°C due to limited creep resistance. The degradation of creep resistance closely depends on the microstructural deterioration, especially the formation of precipitate-free zones (PFZs), but the detailed evolution process remains unclear in this regard. The present study adopted a <em>quasi-in-situ</em> methodology to track the evolution process of the PFZs in Mg-2.5Gd-0.1Zr (at.%) alloy during creep at 300°C under 60 MPa. In the early creep stage, the widening of PFZs and phase transformation of intragranular precipitates are repressed by the applied stress. In the steady and accelerated creep stages, propagation of dislocations generates misorientation between PFZs and their parent grains, leading to the formation of Type-A PFZs. Meanwhile, vacancy diffusion leads to inverse migration of grain boundaries, and produces PFZs with serrated grain boundaries between split rows of grain boundary particles, causing the formation of Type-B PFZs. Secondary intergranular cracks tend to develop in Type-B PFZs in the accelerated creep stage, but the strain accumulation in Type-A PFZs is the key contributor to premature creep failure.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"59 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143401268","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 : 2025-02-13DOI: 10.1016/j.jmst.2024.11.081
Xiaoyu Zheng, Minghui Li, Jing Li, Xiangyang Li, Yao Zhou
Metal-organic frameworks (MOFs) are promising highly active electrocatalysts with well-defined structures, high porosity, and abundant redox sites. However, most of them undergo a pyrolysis treatment to form derivatives and are employed as the catalytic phase, leading to the structural collapse and loss of organic linkers. Utilizing the pristine MOFs can greatly maximize their superiority. In this review, we summarize the recent advances of pristine MOFs in the electrocatalytic HER/OER/ORR/CO2RR process from the perspective of metal-anion and ligand-based active sites. For each electrocatalytic reaction, the tuning strategies and the effects of different active sites on electrochemical performance are discussed. Finally, the current challenges and future directions of pristine MOF-based electrocatalytic materials are outlined.
{"title":"Progress of pristine metal-organic frameworks for electrocatalytic applications","authors":"Xiaoyu Zheng, Minghui Li, Jing Li, Xiangyang Li, Yao Zhou","doi":"10.1016/j.jmst.2024.11.081","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.11.081","url":null,"abstract":"Metal-organic frameworks (MOFs) are promising highly active electrocatalysts with well-defined structures, high porosity, and abundant redox sites. However, most of them undergo a pyrolysis treatment to form derivatives and are employed as the catalytic phase, leading to the structural collapse and loss of organic linkers. Utilizing the pristine MOFs can greatly maximize their superiority. In this review, we summarize the recent advances of pristine MOFs in the electrocatalytic HER/OER/ORR/CO<sub>2</sub>RR process from the perspective of metal-anion and ligand-based active sites. For each electrocatalytic reaction, the tuning strategies and the effects of different active sites on electrochemical performance are discussed. Finally, the current challenges and future directions of pristine MOF-based electrocatalytic materials are outlined.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"129 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143418486","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}
To enhance the anti-corrosion performance of TC4 alloy across a wide temperature range for modern aircrafts operating in increasingly harsh environments, the (TiB+TiC) hybrid reinforced TC4 composites were prepared by laser melting deposition (LMD) via the in-situ reaction between B4C reinforcement and molten TC4 alloy. The effect of B4C content (0, 0.5, 1.5, wt%) on the microstructure and room/high-temperature corrosion behaviour of the composites was investigated. Microstructural analysis revealed that the microstructure of the composites was significantly influenced by the B4C content. The composite containing 0.5 wt% B4C exhibited an optimal microstructure characterized by refined grains, equiaxed α-Ti transformed from lath-shaped α-Ti, well-distributed (TiB+TiC) phases with a proper amount and reduced pore/dislocation defects. This composite also demonstrated the best corrosion resistance at both room temperature (25°C) and high temperature (800°C), which was primarily attributed to its comprehensive advantages including a favorable microstructure, a uniform dispersion of thermally stable (TiB+TiC) phases and a stable passivation film.
{"title":"Laser melting deposition of in-situ (TiB+TiC) hybrid reinforced TC4 composites: Preparation, microstructure and room/high-temperature corrosion behaviour","authors":"Yang Zheng, Ruize Xiong, Zihao Zhao, Cenya Zhao, ZhiFang Wang, Wei Niu, Hui Xue, Fang Cheng, Wei Liu, Songbo Wei","doi":"10.1016/j.jmst.2024.11.080","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.11.080","url":null,"abstract":"To enhance the anti-corrosion performance of TC4 alloy across a wide temperature range for modern aircrafts operating in increasingly harsh environments, the (TiB+TiC) hybrid reinforced TC4 composites were prepared by laser melting deposition (LMD) via the in-situ reaction between B<sub>4</sub>C reinforcement and molten TC4 alloy. The effect of B<sub>4</sub>C content (0, 0.5, 1.5, wt%) on the microstructure and room/high-temperature corrosion behaviour of the composites was investigated. Microstructural analysis revealed that the microstructure of the composites was significantly influenced by the B<sub>4</sub>C content. The composite containing 0.5 wt% B<sub>4</sub>C exhibited an optimal microstructure characterized by refined grains, equiaxed α-Ti transformed from lath-shaped α-Ti, well-distributed (TiB+TiC) phases with a proper amount and reduced pore/dislocation defects. This composite also demonstrated the best corrosion resistance at both room temperature (25°C) and high temperature (800°C), which was primarily attributed to its comprehensive advantages including a favorable microstructure, a uniform dispersion of thermally stable (TiB+TiC) phases and a stable passivation film.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"64 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143418488","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 : 2025-02-13DOI: 10.1016/j.jmst.2025.01.005
Yujie Luan, Xiaolin Yan, Chengwei Ji, Changpeng Lv, Di Lan, Siyuan Zhang, Jin Sun, Daohao Li, Guanglei Wu
Anion exchange membrane electrolysis (AEMWE) is currently a promising technology to produce hydrogen from water. Developing the highly intrinsic activity of electrodes is extremely important. In this paper, nitrogen vacancies-rich cobalt nitride (Co4N-VN) is used as the anode catalyst of the urea oxidation reaction (UOR) and its loading Pt (Pt@Co4N-VN) acted as the cathode of hydrogen evolution reaction (HER). The introduction of N-vacancies gained the electron-deficient Co4N more favorable for the UOR process. Meanwhile, the electron transfer between the Co4N-VN carrier and Pt can enhance the intrinsic HER activity of loaded Pt. Specifically, in the 0.33 M urea and 1.0 M KOH electrolyte, the UOR potential of CO4N-VN is only 1.58 V at the current density of 300.0 mA cm−2, which is much lower than that of Co4N and Co3O4. At the same time, the HER overpotential at 1.0 M KOH and 300.0 mA cm−2 is only 120.0 mV, lower than 20 wt% Pt/C. By measuring the bode phase diagram, the presence of N-vacancies can accelerate the electron transfer rate of catalysts to improve the UOR and HER electrocatalytic activity. The overall water-splitting device featuring Pt@Co4N-VN||Co4N-VN electrodes achieves a voltage of 2.99 V at a current density of 300.0 mA cm−2.
{"title":"Nitrogen vacancies cobalt nitride and its loading Pt electrocatalysts for efficient overall water splitting","authors":"Yujie Luan, Xiaolin Yan, Chengwei Ji, Changpeng Lv, Di Lan, Siyuan Zhang, Jin Sun, Daohao Li, Guanglei Wu","doi":"10.1016/j.jmst.2025.01.005","DOIUrl":"https://doi.org/10.1016/j.jmst.2025.01.005","url":null,"abstract":"Anion exchange membrane electrolysis (AEMWE) is currently a promising technology to produce hydrogen from water. Developing the highly intrinsic activity of electrodes is extremely important. In this paper, nitrogen vacancies-rich cobalt nitride (Co<sub>4</sub>N-V<sub>N</sub>) is used as the anode catalyst of the urea oxidation reaction (UOR) and its loading Pt (Pt@Co<sub>4</sub>N-V<sub>N</sub>) acted as the cathode of hydrogen evolution reaction (HER). The introduction of N-vacancies gained the electron-deficient Co<sub>4</sub>N more favorable for the UOR process. Meanwhile, the electron transfer between the Co<sub>4</sub>N-V<sub>N</sub> carrier and Pt can enhance the intrinsic HER activity of loaded Pt. Specifically, in the 0.33 M urea and 1.0 M KOH electrolyte, the UOR potential of CO<sub>4</sub>N-V<sub>N</sub> is only 1.58 V at the current density of 300.0 mA cm<sup>−2</sup>, which is much lower than that of Co<sub>4</sub>N and Co<sub>3</sub>O<sub>4</sub>. At the same time, the HER overpotential at 1.0 M KOH and 300.0 mA cm<sup>−2</sup> is only 120.0 mV, lower than 20 wt% Pt/C. By measuring the bode phase diagram, the presence of N-vacancies can accelerate the electron transfer rate of catalysts to improve the UOR and HER electrocatalytic activity. The overall water-splitting device featuring Pt@Co<sub>4</sub>N-V<sub>N</sub>||Co<sub>4</sub>N-V<sub>N</sub> electrodes achieves a voltage of 2.99 V at a current density of 300.0 mA cm<sup>−2</sup>.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"63 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143418498","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}
Diffusion of solutes significantly affects the coarsening rate of <span><span style=""></span><span data-mathml='<math xmlns="http://www.w3.org/1998/Math/MathML"><msup is="true"><mi is="true">γ</mi><mo is="true">′</mo></msup></math>' role="presentation" style="font-size: 90%; display: inline-block; position: relative;" tabindex="0"><svg aria-hidden="true" focusable="false" height="2.663ex" role="img" style="vertical-align: -0.697ex;" viewbox="0 -846.5 845.9 1146.6" width="1.965ex" xmlns:xlink="http://www.w3.org/1999/xlink"><g fill="currentColor" stroke="currentColor" stroke-width="0" transform="matrix(1 0 0 -1 0 0)"><g is="true"><g is="true"><use xlink:href="#MJMATHI-3B3"></use></g><g is="true" transform="translate(551,362)"><use transform="scale(0.707)" xlink:href="#MJMAIN-2032"></use></g></g></g></svg><span role="presentation"><math xmlns="http://www.w3.org/1998/Math/MathML"><msup is="true"><mi is="true">γ</mi><mo is="true">′</mo></msup></math></span></span><script type="math/mml"><math><msup is="true"><mi is="true">γ</mi><mo is="true">′</mo></msup></math></script></span> precipitates in precipitation-hardened high entropy alloys (PH-HEAs). In this work, we systematically study the refractory solutes M (Hf, Nb, Ta, Mo, W, Re, Ru) diffusion in face-centered-cubic (FCC) NiCoFeCr lattice through a combination of first-principles calculations, diffusion couples, and coarsening of <span><span style=""></span><span data-mathml='<math xmlns="http://www.w3.org/1998/Math/MathML"><msup is="true"><mi is="true">γ</mi><mo is="true">′</mo></msup></math>' role="presentation" style="font-size: 90%; display: inline-block; position: relative;" tabindex="0"><svg aria-hidden="true" focusable="false" height="2.663ex" role="img" style="vertical-align: -0.697ex;" viewbox="0 -846.5 845.9 1146.6" width="1.965ex" xmlns:xlink="http://www.w3.org/1999/xlink"><g fill="currentColor" stroke="currentColor" stroke-width="0" transform="matrix(1 0 0 -1 0 0)"><g is="true"><g is="true"><use xlink:href="#MJMATHI-3B3"></use></g><g is="true" transform="translate(551,362)"><use transform="scale(0.707)" xlink:href="#MJMAIN-2032"></use></g></g></g></svg><span role="presentation"><math xmlns="http://www.w3.org/1998/Math/MathML"><msup is="true"><mi is="true">γ</mi><mo is="true">′</mo></msup></math></span></span><script type="math/mml"><math><msup is="true"><mi is="true">γ</mi><mo is="true">′</mo></msup></math></script></span> precipitates experiments. Our calculations reveal that there exists a stronger negative correlation between solute diffusivity and Young's modulus than between solute diffusivity and atomic size; i.e., the higher the Young's modulus, the more difficult solute diffusion is. Based on the electronic structure analysis, the underlying origins for such a relationship could be ascribed to the fact that solutes with high Young's modulus ha
{"title":"Unexpected Young's modulus dependence of refractory solute diffusion in NiCoFeCr-based high entropy alloys","authors":"Haoyang Yu, Wei Fang, Tiexu Peng, Chang Liu, Hongxian Xie, Bin Gan, Xin Zhang, Jia Li, Fuxing Yin","doi":"10.1016/j.jmst.2024.12.037","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.12.037","url":null,"abstract":"Diffusion of solutes significantly affects the coarsening rate of <span><span style=\"\"></span><span data-mathml='<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup is=\"true\"><mi is=\"true\">&#x3B3;</mi><mo is=\"true\">&#x2032;</mo></msup></math>' role=\"presentation\" style=\"font-size: 90%; display: inline-block; position: relative;\" tabindex=\"0\"><svg aria-hidden=\"true\" focusable=\"false\" height=\"2.663ex\" role=\"img\" style=\"vertical-align: -0.697ex;\" viewbox=\"0 -846.5 845.9 1146.6\" width=\"1.965ex\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"><g fill=\"currentColor\" stroke=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><g is=\"true\"><g is=\"true\"><use xlink:href=\"#MJMATHI-3B3\"></use></g><g is=\"true\" transform=\"translate(551,362)\"><use transform=\"scale(0.707)\" xlink:href=\"#MJMAIN-2032\"></use></g></g></g></svg><span role=\"presentation\"><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup is=\"true\"><mi is=\"true\">γ</mi><mo is=\"true\">′</mo></msup></math></span></span><script type=\"math/mml\"><math><msup is=\"true\"><mi is=\"true\">γ</mi><mo is=\"true\">′</mo></msup></math></script></span> precipitates in precipitation-hardened high entropy alloys (PH-HEAs). In this work, we systematically study the refractory solutes M (Hf, Nb, Ta, Mo, W, Re, Ru) diffusion in face-centered-cubic (FCC) NiCoFeCr lattice through a combination of first-principles calculations, diffusion couples, and coarsening of <span><span style=\"\"></span><span data-mathml='<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup is=\"true\"><mi is=\"true\">&#x3B3;</mi><mo is=\"true\">&#x2032;</mo></msup></math>' role=\"presentation\" style=\"font-size: 90%; display: inline-block; position: relative;\" tabindex=\"0\"><svg aria-hidden=\"true\" focusable=\"false\" height=\"2.663ex\" role=\"img\" style=\"vertical-align: -0.697ex;\" viewbox=\"0 -846.5 845.9 1146.6\" width=\"1.965ex\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"><g fill=\"currentColor\" stroke=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><g is=\"true\"><g is=\"true\"><use xlink:href=\"#MJMATHI-3B3\"></use></g><g is=\"true\" transform=\"translate(551,362)\"><use transform=\"scale(0.707)\" xlink:href=\"#MJMAIN-2032\"></use></g></g></g></svg><span role=\"presentation\"><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup is=\"true\"><mi is=\"true\">γ</mi><mo is=\"true\">′</mo></msup></math></span></span><script type=\"math/mml\"><math><msup is=\"true\"><mi is=\"true\">γ</mi><mo is=\"true\">′</mo></msup></math></script></span> precipitates experiments. Our calculations reveal that there exists a stronger negative correlation between solute diffusivity and Young's modulus than between solute diffusivity and atomic size; i.e., the higher the Young's modulus, the more difficult solute diffusion is. Based on the electronic structure analysis, the underlying origins for such a relationship could be ascribed to the fact that solutes with high Young's modulus ha","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"42 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143192542","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}
Polysiloxane-based thermally conductive composites are essential for electronic heat management, but they face challenges such as limited thermal conductivity enhancement and low improvement efficiency. In this work, a novel liquid crystal crosslinker (LCC) based on biphenyl liquid crystal moieties was synthesized. Liquid crystal polydimethylsiloxane (LC-PDMS) with intrinsic high λ was prepared by crosslinking vinyl/methyl-hydrogen functionalized PDMS by LCC at its liquid crystal transition temperature, and boron nitride nanosheets (BNNs) with different particle sizes were used to prepare BNNs/LC-PDMS composites.When the mass ratio of LCC to vinyl-terminated PDMS is 2:1, the LC-PDMS exhibitsa well-ordered liquid crystal phase, and its λ∥ reachesthe maximum value of 0.34 W(mK)−1, approximately 1.7 times that of general PDMS (0.20 W(mK)−1). The λ∥ of BNNs/LC-PDMS composites increases with the addition of BNNs, and when the mass fraction of BNNs reaches30 wt%, with a 1:9 mass ratio of small BNNs (1 μm) to large BNNs (10 μm), the composite achieves the highest λ∥ of 12.50 W(mK)−1, a 68.5% increase compared to BNNs/PMDS composites containing the same amount of BNNs (7.42 W(mK)−1). Additionally, BNNs/LC-PDMS composites also demonstrate excellent electrical insulation properties and low density, making them promising candidates for applications in highly integrated electronics fields.
{"title":"Enhancing thermal conductivity in polysiloxane composites through synergistic design of liquid crystals and boron nitride nanosheets","authors":"Xiao Ma, Haitian Zhang, Yongqiang Guo, Mukun He, Hua Guo, Zhiyuan Liu, Xinrui Jing, Xinxin Zheng, Yanjun Liu, Silin Bai, Xuetao Shi, Jiangtao Wang, Junwei Gu","doi":"10.1016/j.jmst.2025.01.004","DOIUrl":"https://doi.org/10.1016/j.jmst.2025.01.004","url":null,"abstract":"Polysiloxane-based thermally conductive composites are essential for electronic heat management, but they face challenges such as limited thermal conductivity enhancement and low improvement efficiency. In this work, a novel liquid crystal crosslinker (LCC) based on biphenyl liquid crystal moieties was synthesized. Liquid crystal polydimethylsiloxane (LC-PDMS) with intrinsic high <em>λ</em> was prepared by crosslinking vinyl/methyl-hydrogen functionalized PDMS by LCC at its liquid crystal transition temperature, and boron nitride nanosheets (BNNs) with different particle sizes were used to prepare BNNs/LC-PDMS composites.When the mass ratio of LCC to vinyl-terminated PDMS is 2:1, the LC-PDMS exhibitsa well-ordered liquid crystal phase, and its <em>λ</em><sub>∥</sub> reachesthe maximum value of 0.34 W(mK)<sup>−1</sup>, approximately 1.7 times that of general PDMS (0.20 W(mK)<sup>−1</sup>). The <em>λ</em><sub>∥</sub> of BNNs/LC-PDMS composites increases with the addition of BNNs, and when the mass fraction of BNNs reaches30 wt%, with a 1:9 mass ratio of small BNNs (1 μm) to large BNNs (10 μm), the composite achieves the highest <em>λ</em><sub>∥</sub> of 12.50 W(mK)<sup>−1</sup>, a 68.5% increase compared to BNNs/PMDS composites containing the same amount of BNNs (7.42 W(mK)<sup>−1</sup>). Additionally, BNNs/LC-PDMS composites also demonstrate excellent electrical insulation properties and low density, making them promising candidates for applications in highly integrated electronics fields.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"49 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143192540","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}
Two-dimensional (2D) noble transition-metal dichalcogenide materials (NTMDs) have garnered remarkable attention due to their intriguing properties exhibiting potential applications in nanoelectronics, optoelectronics, and photonics. The electronic structure and physical properties of 2D NTMDs can be effectively modulated using alloy engineering strategy. Nevertheless, the precise growth of wafer-scale 2D NTMDs alloys remains a significant challenge. In this work, we have achieved the controllable preparation of wafer-scale (2-inch) 2D PdS2xSe2(1-x) nanofilms (NFs) with fully tunable compositions on various substrates using pre-deposited Pd NFs assisted chemical vapor deposition technique. High-performance photodetectors based on the PdS2xSe2(1-x) NFs were fabricated, which exhibit broadband photodetection performance from visible to near-infrared (NIR) wavelength range at room temperature. Significantly, the PdS0.9Se1.1-based photodetectors display a responsivity up to 0.192 A W−1 and a large specific detectivity of 5.5 × 1011 Jones for 850 nm light, enabling an excellent high-resolution NIR single-pixel imaging (SPI) without an additional filtering circuit. Our work paves a new route for the controlled synthesis of wafer-scale and high-quality 2D NTMDs alloy NFs, which is essential for designing advanced optoelectronic devices.
{"title":"Controllable growth of wafer-scale two-dimensional PdS2xSe2(1-x) nanofilms with fully tunable compositions for high-performance photodetectors","authors":"Huan Zhou, Yulong Hao, Chen Fan, Shiwei Zhang, Chen Wang, Kaiyi Wang, Jie Zhou, Shijie Hao, Ting Shu, Xuemei Lu, Bo Li, Yongqiang Yu, Guolin Hao","doi":"10.1016/j.jmst.2024.12.036","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.12.036","url":null,"abstract":"Two-dimensional (2D) noble transition-metal dichalcogenide materials (NTMDs) have garnered remarkable attention due to their intriguing properties exhibiting potential applications in nanoelectronics, optoelectronics, and photonics. The electronic structure and physical properties of 2D NTMDs can be effectively modulated using alloy engineering strategy. Nevertheless, the precise growth of wafer-scale 2D NTMDs alloys remains a significant challenge. In this work, we have achieved the controllable preparation of wafer-scale (2-inch) 2D PdS<sub>2</sub><em><sub>x</sub></em>Se<sub>2(1-</sub><em><sub>x</sub></em><sub>)</sub> nanofilms (NFs) with fully tunable compositions on various substrates using pre-deposited Pd NFs assisted chemical vapor deposition technique. High-performance photodetectors based on the PdS<sub>2</sub><em><sub>x</sub></em>Se<sub>2(1-</sub><em><sub>x</sub></em><sub>)</sub> NFs were fabricated, which exhibit broadband photodetection performance from visible to near-infrared (NIR) wavelength range at room temperature. Significantly, the PdS<sub>0.9</sub>Se<sub>1.1</sub>-based photodetectors display a responsivity up to 0.192 A W<sup>−1</sup> and a large specific detectivity of 5.5 × 10<sup>11</sup> Jones for 850 nm light, enabling an excellent high-resolution NIR single-pixel imaging (SPI) without an additional filtering circuit. Our work paves a new route for the controlled synthesis of wafer-scale and high-quality 2D NTMDs alloy NFs, which is essential for designing advanced optoelectronic devices.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"164 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143192541","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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