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Microstructure and thermal performance of Al2(1-x)Mg xTi1+xO5

Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal materials and Engineering 2002年第SUPPL. 1期31卷 91-91页

作者： Shen, Qiang Zhang, Lianmeng Fang, Qing Wang, Chuanbin State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

The solid solutions of Al2(1.x)MgxTi 1+xO5 (x=0,0.01,0.05,0.1) were fabricated by the solid phase reaction method, and they were sintered under normal pressure. The thermal performance of Al2(1-x)MgxTi1+xO 5 was mainly investigated. The results show that, the additive MgTi2O5 can not only restrain the decomposition of Al 2TiO5, but also greatly improve the densification of the solid solutions. With increasing mole percent of x, the thermal stability of Al2(1-x)MgxTi1+xO5 increases and the expansion coefficient decreases.

关键词： Al2(1-x)MgxTi1+xO5 Microstructure Thermal decompose Thermal expansion

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Strongly Enhancing the Energy Storage Properties and Stability of Amorphous BaTiO3 Thin Films via Ions Doping

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SSRN 2024年

作者： Chang, Ruiling Yao, Zhonghua Xing, Yutong Wang, Jun Hao, Hua Cao, Minghe Liu, Hanxing State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Material Science and Engineering Wuhan University of Technology Wuhan430070 China International School of Material Science and Engineering Wuhan University of Technology Wuhan430070 China Sanya Science and Education Innovation Park of Wuhan University of Technology Sanya572000 China

Amorphous thin films with high power density and breakdown strength satisfy the needs of advanced power electronic systems. Nonetheless, improving the energy storage density of amorphous films is critical for addressing the growing demand for electricity. We apply high spontaneous polarization BaTiO3 as the main component to make (1-x)Ba(Ti0.99Mn0.02)O3-xBiFeO3((1-x)BTM-xBF) thin films. Doping BiFeO3 (BF) synergistically boosts polarization. The introduction of amorphous phases and Mn ions enhances the breakdown strength. The results demonstrate that, at x=0.10, the film can achieve both a high efficiency of 80.3% and an excellent energy storage density of 111.3 J cm-3. Moreover, the film has a strong thermal stability within a broad range of 20°C ~ 160°C, as well as the cycling reliability is as high as 105 times. The present study offers a practical approach to develop film capacitors with outstanding energy storage capabilities. © 2024, The Authors. All rights reserved.

关键词： Amorphous films

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Density functional theory investigation of oxygen interaction with boron-doped graphite

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Applied Surface Science 2016年 390卷 273-282页

作者： Juan Liu Chen Wang Tongxiang Liang Wensheng Lai State Key Lab of New Ceramic and Fine Processing Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084 China Advanced Material Laboratory School of Materials Science & Engineering Tsinghua University Beijing 100084 China

Boron inserted as impurity by substitution of carbon atoms in graphite is known to change (improve or deteriorate) oxidation resistance of nuclear graphite, but the reason for both catalytic and inhibiting oxidation is still uncertain. As a first step, this work is more specially devoted to the adsorption and diffusion of oxygen atoms on the surface and related to the problem of oxygen retention on the pure and boron-containing graphite surfaces. Adsorption energies and energy barriers associated to the diffusion for molecular oxygen recombination are calculated in the density functional theory framework. The existence of boron modifies the electronic structure of the surface, which results in an increase of the adsorption energy for O. However, low boron loading makes it easier for the recombination into molecular oxygen. For high boron concentration, it induces a better O retention capability in graphite because the presence of B-B bonds decreases recombination of the adsorbed oxygen atoms. A possible explanation for both catalytic and inhibiting effects of boron in graphite is proposed.

关键词： Density functional calculations Chemisorption Graphite Boron Oxygen

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Preface to Special Issue for Chinese Symposium on Photocatalytic materials(CSPM)

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Chinese Journal of Catalysis 2019年第3期40卷 239-239页

作者：余家国李鑫李朝晖 State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology College of Forestry and Landscape Architecture Key Laboratory of Energy Plants Resource and Utilization Ministry of Agriculture South China Agricultural University State Key Laboratory of Photocatalysis on Energy and Environment College of Chemistry Fuzhou University

The Chinese Symposium on Photocatalytic materials (CSPM) was held at the Wuhan University of technology, Wuhan, China on July 26-29, 2018. The CSPM symposium was jointly organized by Wuhan University of technology, Fuzhou University and Xuchang University, and was supported by National Natural Science Foundation of China (NSFC), Wuhan University of technology, Fuzhou University, Xuchang University, Beijing Perfectlight and others. More than 320 colleagues from four continents (Asia, America, Australia and Europe) participated in this symposium, and presented 10 plenary lectures, 13 keynote lectures, 35 invited lectures, 8 oral lectures and 144 posters. 10 best posters were selected.

关键词：光催化材料学术研讨会

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Bronze TiO2 as a cathode host for lithium-sulfur batteries

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能源化学 2020年第9期48卷 259-266页

作者： Wenjing Dong Di Wang Xiaoyun Li Yuan Yao Xu Zhao Zhao Wang Hong-En Wang Yu Li Lihua Chen Dong Qian Bao-Lian Su State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 Hubei China State Key Laboratory of Silicate Material for Architectures Wuhan University of Technology Wuhan 430070 Hubei China Beijing National Laboratory of Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China Institute of Chemical Materials Chinese Academy of Engineering Physics Mianyang 621900 Sichuan China College of Chemistry and Chemical Engineering Central South University Changsha 410083 Hunan China Laboratory of Inorganic Materials Chemistry (CMI) University of Namur B-5000 Namur Belgium

Lithium-sulfur batteries (LSBs) are very promising for large-scale electrochemical energy ***,dissolution and shuttling of lithium polysulfides (LiPSs) intermediates have severely affected their overall electrochemical properties and limited their practical *** polar cathode hosts that can effectively bind LiPSs and simultaneously promote their redox conversion is crucial for realizing high-performance ***,we report bronze TiO2 (TiO2-B) nanosheets (-5 nm in thickness) chemically bonded with carbon as a novel multifunctional cathode host for advanced *** lobservation and first-principles density functional theory (DFT) calculations reveal that the TiO2-B with exposed (100) plane and Ti3+ ions exhibited high chemical affinity toward polysulfides and effectively confined them at ***,Ti3+ ions and interface coupling with carbon promoted electronic conductivity of the composite cathode,leading to enhanced redox conversion kinetics of LiPSs during charge/***,the as-assembled TiO2-B/S cathode manifested high capacity (1165 mAh/g at 0.2 C),excellent rate capability (244 mAh/g at 5 C) and outstanding cyclab.lity (572 mAh/g over 500 cycles at 0.2 C).This work sheds insights on rational design and fabrication of novel functional electrode materials for beyond Li-ion batteries.

关键词： Titanium dioxide Cathode Polysulfides Shuttle effect Lithium-sulfur batteries Electrochemistry Density functional theory

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Scalab.e Assembly of Layered Dielectric Nanocomposites Filled with Perovskite Nanosheets for Flexible Electronics

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SSRN 2024年

作者： Fu, Si Ren, Lele Wang, Jian Liu, Hexing Zhang, Pengchao Shen, Zhonghui Zhang, Xin Tu, Rong Zhang, Song Nan, Ce-Wen Li, Bao-Wen State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China State Key Lab of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing100084 China

Polymer-based dielectrics have attracted much attention in the field of flexible electronics due to their excellent flexibility, dielectric and mechanical properties. However, the rational design of nanofiller-polymer nanocomposite for improving dielectric and mechanical properties remains challenging. Herein, layered nanocomposites filled with high-κ Ca2Nb3O10 perovskite nanosheets were fabricated via shear-flow induced alignment of nanosheets. The hierarchical structure and good dispersion of nanosheets endowed the layered nanocomposites with an outstanding modulus of 12.7 GPa and toughness of 1.8 MJ/m3. Meanwhile, the layered nanocomposites exhibited a high dielectric constant of 14.7, a low dielectric loss of 4.2%, and low leakage current density -7 A/cm2. The layered high-κ nanocomposites designed in this work will have broad application prospects in th flexible electronics. © 2024, The Authors. All rights reserved.

关键词： Perovskite

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Resistive switching in Pt/CuxO/Si/Pt device

Resistive switching in Pt/CuxO/Si/Pt device

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中国物理学会2013年秋季学术会议

作者： Linlin Wei Dashan Shang Jirong Sun Zhigang Sun State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of TechnologyWuhan 430070People''s Republic of China Beijing National Laboratory for Condensed Matter Physics and Institute of PhysicsChinese Academic of SciencesBeijing 100190People''s Republic of China State Key Laboratory of Advanced Technology for Material Synthesis and ProcessingWuhan University of TechnologyWuhan 430070People''s Republic of China Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academic of SciencesBeijing 100190People''s Republic of China

Nanoionics-based memristive devices(NIMD)have attracted intensive attention in recent years due to their potential application in resistive random access memory(RRAM)as well as reconfigurable logic devices [1,2].

关键词： memristive switching uniform-like switching ion migration nonvolatile memory

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Enhanced stability of highly-dispersed copper catalyst supported by hierarchically porous carbon for long term selective hydrogenation

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催化学报 2020年第7期41卷 1081-1090页

作者： Hu Nian Li Xiaoyun Liu Siming Wang Zhao He Xiaoke Hou Yuexin Wang Yuxiang Deng Zhao Chen Lihua Su Baolian Laboratory of Living Materials Wuhan University of Technology the State Key Laboratory of Advanced Technology for Material Synthesis and Processing Hubei Wuhan 430070 Wuhan University of Technology State Key Laboratory of Silicate Materials for Architectures Hubei Wuhan 430070 Laboratory of Inorganic Materials Chemistry (CMI) University of Namur Belgium Namur B-5000 Clare Hall University of Cambridge Cambridge CB3 9AL

Copper based catalysts have high potential for the substituent of noble-metal based catalysts as their high selectivity and moderate activity for selective hydrogenation reaction; however, achieving further high catalytic stability is very difficult. In this work, the carbonization process of Cu-based organic frameworks was explored for the synthesis of highly-dispersed Cu supported by hierarchically porous carbon with high catalytic performance for selective hydrogenation of 1,3-butadiene. The porous hierarchy of carbon support and the dispersion of copper nanoparticles can be precisely tuned by controlling the carbonization process. The resultant catalyst carbonized at 600 °C exhibits a rather low reaction temperature at 75 °C for 100% butadiene conversion with 100% selectivity to butenes, due to its reasonable porous hierarchy and highly-dispersed copper sites. More importantly, unprecedentedly stability of the corresponding Cu catalyst was firstly observed for selective 1,3-butadiene hydrogenation, with both 100% butadiene conversion and 100% butenes selectivity over 120 h of reaction at 75 °C. This study verifies that a simply control the carbonization process of metal organic frameworks can be an effective way to obtain Cu-based catalysts with superior catalytic performance for selective hydrogenation reaction.

关键词： Hierarchically porous structure Catalyst Cu/C Selective hydrogenation Metal organic frameworks

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Preface to Special Issue on the International Symposium on Environmental Catalysis(ISEC 2016)

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Chinese Journal of Catalysis 2017年第2期38卷 191-191页

作者：李金林余家国 Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission and Ministry of Education South-Central University for Nationalities State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology

With a growing awareness of pollution and increasing demands for environmental protection, a great deal of effort is being put into the development of catalysts with improved activity for the abatement of pollutants, ... 详细信息

关键词： awareness emitted thank helping symposium speakers invitation acceptance reviewers editorial

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Rationally Designing Anti-Poisoning Polymer Electrolyte by Electronegativity Modulation: Towards Efficient Ammonia-Cracked Hydrogen Fuel Cells

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SSRN 2023年

作者： Shuai, Jiaqi Zhao, Shengqiu Liao, Yucong Wu, Fanglin Wang, Rui Wang, Letian Shen, Chunhui Tang, Haolin State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Department of Polymer Materials & Engineering School of Material Science & Engineering Wuhan University of Technology Wuhan430070 China Hubei Key Laboratory of Fuel Cells Wuhan University of Technology Wuhan430070 China

Ammonia as a hydrogen enrichment medium has tremendous advantages over pure hydrogen in terms of transportation and utilization. The high-efficiency anti-ammonia-poisoning membrane electrode assembly (MEA) is pivotal for the practical implementation of ammonia-resistant proton exchange membrane fuel cells (PEMFCs). As for the polymer electrolyte, which is an integral part of the proton exchange membrane (PEM) and catalytic layer (CL) binder in the MEA, structural design is an effective way to improve its resistance to ammonia poisoning. Herein, an in-depth study of sulfonimides with superacidic structures reveals that the proton dissociation energies can be altered by tuning the terminal groups with different electronegativity and enhancing the competitive adsorption of protons on Pt. Four perfluorinated backbone sulfonimides (PFSI-x (x= TSM, MSA, ESA, and iPSA)) with distinct charge delocalization were fabricated by grafting different electronegative monomers onto the perfluorosulfonyl fluoride (PFSF). The results show that PFSI-TSM possesses a higher electrostatic potential (2.69 eV) and the lowest activation energy (12.07 KJ/mol). Meanwhile, the performance of the PFSI-TSM PEM fuel cell is 40.6% higher than the PFSA at 80°C, 100% relative humidity (RH) under 100 ppm NH3, with a maximum power density of 635.2 mW/cm2. The underlying reason for enhanced performance is in virtue of the more electronegative end groups render the superacid electrolyte with higher acidity and pKa values, which change the direction of the acid dissociation equilibrium reaction on the Pt surface, enhance the competitive adsorption of protons in the MEA and reduces the probability of ammonia adsorption poisoning. The insights in charge delocalization and proton ionization construct the structure-property relationship which would provide the guidance for a rational design of PEM for ammonia-resistant fuel cells. © 2023, The Authors. All rights reserved.

关键词： Electronegativity

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