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Magnetic field-enhanced photoelectrochemical water splitting of Co_(3)O_(4)/TiO_(2)for efficient oxygen evolution

Science China materials 2024年第10期67卷 3168-3175页

作者： Ze-En Zhou Yi Lu Yi-Xuan Liu Shang Cao Ge Tian Zhi-Yi Hu Ling Shen Si-Ming Wu Jie Ying Wei Geng Xiao-Yu Yang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing&Shenzhen Research Institute&Laoshan Laboratory Wuhan University of TechnologyWuhan 430070China National Energy Key Laboratory for New Hydrogen-Ammonia Energy Technologies Foshan Xianhu LaboratoryFoshan 528200China Nanostructure Research Centre(NRC) Wuhan University of TechnologyWuhan 430070China School of Chemical Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China

Effective separation of photogenerated carriers plays a vital role in governing the efficiency of photo-electrocatalytic ***,the advancement in enhancing the intrinsic carrier separation efficiency of semiconductors has shown limited ***,we reported the use of a magnetic field to improve the photoelectrochemical water splitting of a magnetic Co_(3)O_(4)/TiO_(2)photoanode by boosting the photogenerated carrier separation *** the presence of the magnetic field,oxygen evolution reaction occurs with a high photocurrent density of 0.86 mA cm^(−2)at 1.23 V versus VRHE,and an applied bias photon-to-current efficiency of 0.342%at 0.61 ***,the photoanode maintains its oxygen evolution reaction for more than 400 h with photocurrent decays by ca.10%.Observations made in this effort show that the enhancement of photo-electrocatalytic efficiency by a magnetic field is a consequence of the effect of the Lorentz force generated by the magnetic field on photogenerated carriers and ions near the Co_(3)O_(4)/TiO_(2)photoanode,which improves the carrier separation efficiency and the bubble release *** results suggest that manipulating photoelectrode carriers by using a magnetic field is a promising strategy to design high-performance photoelectrochemical for water splitting.

关键词： photoelectrochemical water splitting Co_(3)O_(4)/TiO_(2) carrier separation efficiency stability

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Spallation Damage Mechanisms and Microstructural Evolution in Selective Laser Melted Ti-6al-4v Under Quasi-Isentropic Loading

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SSRN 2024年

作者： Zhang, Kaichang Li, Peibo Zhang, Yang Sun, Yi Luo, Guoqiang Shen, Qiang Hubei Longzhong Laboratory Hubei Xiangyang441000 China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

The microstructure of additively manufactured Ti-6Al-4V significantly differs from that of traditional casting processes, and this microstructural variation directly impacts the material's mechanical properties. To ensure the safety and stability of additively manufactured Ti-6Al-4V in practical applications, this study achieves controlled dynamic loading by optimizing the cross-sectional surface density of the structural gradient flyer(SGFs). It further explores material response characteristics under varying stress and strain rates by adjusting the loading rate in spallation experiments. The initial microstructure of Ti-6Al-4V produced via selective laser melting (SLM) was investigated and analyzed. Quasi-isentropic loading experiments were conducted on 6 mm thick samples at strain rates ranging from 5.07 to 12.38 × 104 s-1. The results demonstrate that, in comparison to as-cast alloys, the SLM-processed Ti-6Al-4V alloys exhibit reduced plasticity, primarily attributed to the higher cooling rates of SLM. The alloys predominantly display brittle fracture characteristics, with distinct transgranular fracture patterns. As the loading strain rate increases, the pulse width of the loading waveform progressively narrows, spall strength markedly rises, and cracks not only propagate but also enlarge. Grain refinement was evident in both the crack extension region and along the edges, accompanied by localized stress concentration, yet no signs of recrystallization were detected. The spall strength of the material exhibited heightened sensitivity to impact stresses relative to plate impact conditions. These findings offer critical theoretical insights into the potential applications of additively manufactured titanium alloys, particularly in aerospace and defense sectors. © 2024, The Authors. All rights reserved.

关键词： Grain refinement

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Mo_(2)C催化的低压纳米Li_(2)C_(2)O_(4)预锂化用于高能量锂离子电池

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Science China materials 2023年第3期66卷 903-912页

作者：钟伟张策李思吾张薇曾子琪程时杰谢佳 State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430000China State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

初始循环中不可逆的锂损失显著降低了锂离子电池的能量密度预锂化是补偿锂损失的有效方法之一,但目前的方法存在预锂化试剂不稳定或容量低的问题.草酸锂(Li_(2)C_(2)O_(4))作为一种高理论容量(相当于锂金属)、低成本和空气稳定的锂补偿... 详细信息

初始循环中不可逆的锂损失显著降低了锂离子电池的能量密度预锂化是补偿锂损失的有效方法之一,但目前的方法存在预锂化试剂不稳定或容量低的问题.草酸锂(Li_(2)C_(2)O_(4))作为一种高理论容量(相当于锂金属)、低成本和空气稳定的锂补偿材料已显示出巨大的潜力.然而低电化学活性和高分解电位严重阻碍了其实际应用.本文中,我们报道了一种低压预锂化技术.通过配合使用Mo_(2)C催化剂和纳米Li_(2)C_(2)O_(4)Mo_(2)C催化剂改变了Li_(2)C_(2)O_(4)周围的电子云分布,大大降低了活化能,从而显著加速了锂从Li_(2)C_(2)O_(4)中的释放.通过冷冻干燥制备的纳米Li_(2)C_(2)O_(4)与Mo_(2)C催化剂形成良好接触并展现出快速的离子和电子传导.得益于这种协同效应,Li_(2)C_(2)O_(4)的分解电位降低了0.5 V,分解效率接近100%.纳米Li_(2)C_(2)O_(4)/Mo_(2)C复合材料补偿的LiCoO_(2)||SiO全电池展现出可以高于对照组46.9%的比容量,显示出巨大的实际应用潜力.

关键词：锂离子电池理论容量预锂化电化学活性分解电位全电池电子传导能量密度

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High-pressure Sintering of Boron Carbide-Titanium Diboride Composites and Its Densification Mechanism

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Journal of Wuhan University of technology(materials Science) 2020年第2期35卷 356-362页

作者： GAO Jiancheng WANG Dangqiang LEI Liwen ZHANG Fan ZHANG Jinyong FU Zhengyi State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

A high-pressure hot-pressing process was applied to densify a commercial boron carbide-titanium diboride (B4C-TiB2) powder *** fully dense (98.6%) materials were obtained at 1700℃ under a pressure of *** to the sintering temperature required to achieve similar results when a pressure of only 30MPa was applied,the sintering temperature was found to decrease by about 200℃ under pressure of 100 *** of the thermodynamics and microstructure showed that the plastic deformation of the B4C grains induced by high pressure dominated the densification mechanism when high pressure was ***,higher pressure resulted in remarkably improved mechanical properties of the composites,which could be traced back to the generation of stacking faults in the B4C grains and aggregation of TiB2.

关键词： hot-pressing high-pressure sintering densification TiB2-B4C

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Ductile-Brittle Transition Mechanism of Highly-Oriented 3c-Sic in Elid

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SSRN 2024年

作者： Li, Hengyi Xu, Qingfang Zhang, Chitengfei Yang, Meijun Tu, Rong Zhang, Song Hubei Longzhong laboratory Xiangyang441000 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Wuhan University of Technology China

Compared with sintered silicon carbides (SiC), highly-orientated 3C-SiC by CVD methods boasts out-of-plane orientation uniformity, which ensures that such materials produce lower surface damage. Through the ELID grinding technique, the differences in grinding behaviors between and -orientated 3C-SiC were investigated. Both highly-orientated 3C-SiC exhibited a grinding surface where brittle and ductile removal coexisted. Specifically, brittle removal regions were observed at grain boundaries, while ductile removal regions were observed within the grains. Further indentation experiments between the two 3C-SiC show that -oriented 3C-SiC displayed a larger critical cut depth of 28.99 nm, with 1.5 times higher than that of -oriented 3C-SiC. The larger critical depth of cut contributes to more ductile removal regions with only a few brittle pits in the -oriented 3C-SiC grinding surface. In addition, the subsurface deformation of -oriented 3C-SiC was characterized by the presence of amorphous zones, dislocations and stacking faults. In contrast to the -oriented, the -oriented 3C-SiC tends to exhibit a brittle removal mode dominated by pits and cracks at the twin boundaries, as its pre-existing twins hinder the dislocation glide, resulting in stress concentration and thus forming cracks. © 2024, The Authors. All rights reserved.

关键词： Silicon carbide

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Awakening the oxygen evolution activity of MoS_(2) by oxophilic-metal induced surface reorganization engineering

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Journal of Energy Chemistry 2021年第11期30卷 546-551,I0013页

作者： Xueqin Mu Yang Zhu Xiangyao Gu Shipeng Dai Qixin Mao Lintao Bao Wenxuan Li Suli Liu Jianchun Bao Shichun Mu Jiangsu Key Laboratory of Biofunctional Materials School of Chemistry and Materials ScienceNanjing Normal UniversityNanjing 210023JiangsuChina Key Laboratory of Advanced Functional Materials of Nanjing Nanjing Xiaozhuang UniversityNanjing 211171JiangsuChina State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu hydrogen ValleyFoshan 528200GuangdongChina

Although molybdenum disulfide (MoS_(2))-based materials are generally known as active electrocatalysts for the hydrogen evolution reaction (HER), the inert performance for the oxygen evolution reaction (OER) seriously limits their wide applications in alkaline electrolyzers due to there exists too strong metal-sulfur (M−S) bond in MoS_(2). Herein, by means of surface reorganization engineering of bimetal Al, Co-doped MoS_(2) (devoted as AlCo_(3)-MoS_(2)) through in situ substituting partial oxidation, we successfully significantly activate the OER activity of MoS_(2), which affords a considerably low overpotential of 323 mV at −30 mA cm^(−2), far lower than those of MoS_(2), Al-MoS_(2) and Co-MoS_(2) catalysts. Essentially, the AlCo_(3)-MoS_(2) substrate produces lots of M−O (M=Al, Co and Mo) species with oxygen vacancies, which trigger the surface self-reconstruction of pre-catalysts and simultaneously boost the electrocatalytic OER activity. Moreover, benefiting from the moderate M−O species formed on the surface, the redistribution of surface electron states is induced, thus optimizing the adsorption of OH* and OOH* intermediates on metal oxyhydroxides and awakening the OER activity of MoS_(2).

关键词： Surface reorganization engineering Porous nanosheets Oxygen evolution reaction MoS_(2) Oxophilic-metal

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Recent progress of Ga_(2)O_(3)materials and devices based on the low-cost,vacuum-free Mist-CVD epitaxial growth method

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Fundamental Research 2024年第5期4卷 1292-1305页

作者： Zeyulin Zhang Pengru Yan Qingwen Song Haifeng Chen Wentao Zhang Hao Yuan Fengyu Du Dinghe Liu Dazheng Chen Yuming Zhang Wide Bandgap Semiconductor Technology Disciplines State Key Laboratory School of MicroelectronicsXidian UniversityXi'an 710071China Xidian-Wuhu Research Institute Wuhu 241000China Key Laboratory of Advanced Semiconductor Devices and Materials School of Electronic EngineeringXi'an University of Posts and TelecommunicationsXi'an 710121China Guangxi Key Laboratory of Optoelectronic Information Processing School of Optoelectronic EngineeringGuilin University of Electronic TechnologyGuilin541004China

Compared with silicon,gallium nitride,silicon carbide,and other traditional semiconductors,gallium oxide(Ga_(2)O_(3))who possesses,an ultrawide bandgap of approximately 5.0 eV and a higher breakdown field strength of approximately 8 MV/cm has attracted increasing attention from researchers,especially for the potential application in power ***,Ga_(2)O_(3)material has natural ultraviolet detection ability for photodetectors due to its ultrawide *** future commercial applications put forward an urgent require for high-quality epitaxial Ga_(2)O_(3)material in an efficient growth method at a lower *** there are some conventional methods for single crystal Ga_(2)O_(3)film epitaxial growth such as MBE and MOCVD,these methods always need a vacuum growth environment and expensive *** a fast-growing method,Mist-CVD gives the growth of Ga_(2)O_(3)in a vacuum-free,process-simple,and low-cost method,which will greatly reduce the cost and facilitate the development of Ga_(2)O_(3).This review has summarizes the Mist-CVD epitaxy growth mechanism of Ga_(2)O_(3),recent progress in the Ga_(2)O_(3)film epitaxial growth,and various device properties based on the Mist-CVD *** work aims to provide help for the development of Ga_(2)O_(3)material growth and device applications.

关键词： Gallium oxide Epitaxy growth Mist-CVD Single crystals Gallium oxide devices

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An organic visible-photocatalytic-adsorbence mechanism to high-efficient removal of heavy metal antimony ions

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materials Reports(Energy) 2024年第3期4卷 49-59页

作者： Linji Yang Ke Sun Tao Liu Ciyuan Huang Libin Zhang Yang Zhou Kai Chen Shangfei Yao Ziyang Zhang Chenfu Zhao Hongxiang Zhu Bingsuo Zou Shuangfei Wang Dongfeng Xue School of Chemistry and Chemical Engineering Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured MaterialsState Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite StructuresSchool of ResourcesEnvironment and MaterialsGuangxi UniversityNanning 530004China Department of Biochemistry and Cell Biology YouJiang Medical University for NationalitiesBaise CityGuangxi Zhuang Autonomous Region 533000China Shenzhen Institute for Advanced Study University of Electronic Science and Technology of ChinaShenzhen 518110China

Purification of emerging heavy metal antimony contaminated water based on advanced ingenious *** activated modified coconut shell charcoal(CSC)was synthesized and evaluated as a substrate-supported loaded organic photovoltaic material,PM6:PYIT:PM6-b-PYIT,to prepare a surprisingly highly efficient,stable,environmentally friendly,and recyclable organic photocatalyst(CSC–N–P.P.P),which showed excellent effects on the simultaneous removal of Sb(Ⅲ)and Sb(Ⅴ).The removal efficiency of CSC-N-P.P.P on Sb(Ⅲ)and Sb(Ⅴ)reached an amazing 99.9%in quite a short duration of 15 *** the same time,under ppb level and indoor visible light(~1 W m^(2)),it can be treated to meet the drinking water standards set by the European Union and the *** Environmental Protection Agency in 5 min,and even after 25 cycles of recycling,the efficiency is still maintained at about 80%,in addition to the removal of As(Ⅲ),Cd(Ⅱ),Cr(Ⅵ),and Pb(Ⅱ)can also be *** catalyst not only solves the problems of low reuse rate,difficult structure adjustment and high energy consumption of traditional photocatalysts but also has strong applicability and practical *** pioneering approach provides a much-needed solution strategy for removing highly toxic heavy metal antimony pollution from the environment.

关键词： Organic photocatalyst Photocatalysis Purification Indoor visible light

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Face-directed Strategy for the Construction of Polyoxovanadate-based Metal-Organic Tetrahedra

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Chemical Research in Chinese Universities 2023年第6期39卷 954-959页

作者： CHEN Huiping GONG Yaru CHU Qiangqiang PANG Xiao HUANG Xiaojing TIAN Xudong YANG Weiting PAN Qinhe SU Zhongmin WANG Xinlong Key Laboratory of Advanced Materials of Tropical Island Resources Ministry of EducationSchool of ScienceHainan UniversityHaikou 570228P.R.China School of Chemical Engineering and Technology Hainan UniversityHaikou 570228P.R.China State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012P.R.China

Polyoxometalate-based metal-organic polyhedra(MOPs)were of particular concern because of the various exquisite building blocks and the suitable constructional *** further understand the design and particularity of polyoxovanadate-based MOPs,(NH_(2)Me)_(8){[V_(6)O_(6)(OCH_(3))_(9)(C_(6)H_(5)PO_(3))]_(4)·(BPT)_(4)}·2DMF(HNU-74)and(NH_(2)Me)12{[V_(6)O_(6)(OCH_(3))_(9)(C_(6)H_(5)PO_(3))]4·(HBCBAIP)_(4)}(SO_(4))_(2)·MeOH·DMF(HNU-75)were constructed by a face-directed synthesis *** structures were assembled with four secondary building units as vertexes and four organic ligands served as *** from HNU-74,HNU-75 showed a carboxyl group free during the coordination process,resulting in the pore channels being blocked and the free carboxyl group linking outwards,paving the way for the formation of the 3D *** to the pore channels of HNU-74,the adsorption of I2 was studied and the adsorption capacity was 148 mg/g.

关键词： Metal-organic polyhedron Face-directed strategy Tetrahedral structure Iodine adsorption

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Electrically variable interfaces in polymer nanocomposite dielectrics

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Physical Review B 2024年第18期109卷 184205-184205页

作者： Wen-Zhi Luo Zhong-Hui Shen Yang Shen Long-Qing Chen Ce-Wen Nan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and Devices Wuhan University of Technology Wuhan 430070 China School of Materials and Microelectronics Wuhan University of Technology Wuhan 430070 China School of Materials Science and Engineering State Key Lab of New Ceramics and Fine Processing Tsinghua University Beijing 100084 China Department of Materials Science and Engineering The Pennsylvania State University University Park Pennsylvania 16802 United States

Polymer nanocomposites generally exhibit unexpected dielectric/electrical performance far beyond the sum of every component, which is mainly due to the interface effect induced by the differences in structures and properties between the nanofillers and the polymer matrix. However, understanding the capricious interface effect in different polymer nanocomposites remains a major challenge. Here, we perform density functional theory calculations to investigate the atomic/molecular configurations and local charge behaviors of heterogeneous interfaces between the fillers of perovskites, oxides, two-dimensional materials, and polar/nonpolar polymers. Our findings demonstrate that atomic reconfiguration takes place during the formation of the inorganic/organic interface in order to minimize the overall energy of the system. Significant charge accumulation occurs at heterogeneous interfaces due to electron redistribution, especially for the examples of HfO2 and negatively charged Ca2Nb3O10. When applying an electric field, local polarization, especially around the interface, will be distorted and enhanced as a result of interfacial interaction. Even for the nonpolar polymer with linear dielectric oxides such as TiO2, induced dipole moments also appear near the interface, leading to the improvement of overall polarizability. The outcomes of our study verify that the variable electrical behaviors at the interfaces are highly dependent on the feature of every component constituting the inorganic/organic interface, which offers valuable insights for optimizing the experimental design of heterogeneous interfaces in polymer nanocomposites.

关键词： Electric polarization Solid-solid interfaces Density functional calculations

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