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Thermodynamics and kinetics of hydriding and dehydriding reactions in Mg-based hydrogen storage materials

Journal of Magnesium and Alloys 2021年第6期9卷 1922-1941页

作者： Qian Li Yangfan Lu Qun Luo Xiaohua Yang Yan Yang Jun Tan Zhihua Dong Jie Dang Jianbo Li Yuan Chen Bin Jiang Shuhui Sun Fusheng Pan National Engineering Research Center for Magnesium Alloys College of Materials Science and EngineeringChongqing UniversityChongqing 400044China State Key Laboratory of Mechanical Transmissions Chongqing UniversityChongqing 400044China State Key Laboratory of Advanced Special Steels Shanghai Key Laboratory of Advanced FerrometallurgySchool of Materials Science and EngineeringShanghai UniversityShanghai 200444China Institute of Quantum and Sustainable Technology(IQST) School of Chemistry and Chemical EngineeringJiangsu UniversityZhenjiang212013China Institut National de la Recherche Scientifique-énergie Matériaux et Télécommunications J3×1S2QuébecCanada

Mg-based materials are one of the most promising hydrogen storage candidates due to their high hydrogen storage capacity,environmental benignity,and high Clarke number ***,the limited thermodynamics and kinetic properties pose major challenges for their engineering ***,we review the recent progress in improving their thermodynamics and kinetics,with an emphasis on the models and the influence of various parameters in the calculated ***,the impact of alloying,composite,and nanocrystallization on both thermodynamics and dynamics are discussed in *** particular,the correlation between various modification strategies and the hydrogen capacity,dehydrogenation enthalpy and temperature,hydriding/dehydriding rates are *** addition,the mechanism of hydrogen storage processes of Mg-based materials is discussed from the aspect of classical kinetic theories and microscope hydrogen transferring *** review concludes with an outlook on the remaining challenge issues and prospects.

关键词： Magnesium-based hydrogen storage materials Hydriding/dehydriding reactions Thermodynamics Kinetic models Analysis methods

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A Clay-Based Pickering Nanoemulsion with Antibacterial Activity

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SSRN 2023年

作者： Kang, Yuetong Zan, Yonghui Cong, Yujie Wang, Xiaoyu Luo, Yufeng Li, Lidong State Key Laboratory for Advanced Metals and Materials School of Materials Science and Engineering University of Science and Technology Beijing Beijing100083 China

Non-biotic antibacterial materials have drawn increasing attention. Some natural clays are able to promote the generation of reactive oxygen species, rendering them as promising candidates in combination with their abundant reserves, low cost and biosafety. However, the antibacterial performance of raw clay is usually below satisfactory due to poor solubility and restricted surface area. Hence, the modulation on dispersion form and the surface modification are essential for the design and practical application of natural clays as antibacterial materials. Herein, we developed a facile method to prepare a Pickering nanoemulsion with chitosan-coated montmorillonite (MMT) nanosheet. The addition of chitosan benefited the exfoliation of raw MMT and the stabilization of resultant colloidal MMT nanosheets, which were subsequently employed for preparing Pickering emulsion. The emulsion exhibited good stability and small size endowing them with good diffusion ability to interact with bacteria. Furthermore, the Pickering emulsion inherited the MMT nanosheet peroxidase-like property and displayed good antibacterial activity. © 2023, The Authors. All rights reserved.

关键词： Clay minerals

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Analysis of Conducted EMI for Sub-Modules in Modular Multilevel Converter

Analysis of Conducted EMI for Sub-Modules in Modular Multile...

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2020 IEEE International Conference on Information technology, Big Data and Artificial Intelligence, ICIBA 2020

作者： Wang, Feng Liu, Jianben Wang, Xuehua State Key Laboratory of Power Grid Environmental Protection Wuhan China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781728152240

Modular multilevel converter (MMC) is stacked by numerous sub-modules (SMs) which contain many stray capacitances. As a result, the analysis of conducted electromagnetic interference (EMI) is very complicated. In this paper, the SMs in the symmetrical position of the upper and lower bridge arms are regarded as a group, And a conducted EMI model is developed to elaborate the common mode (CM) interference mechanism of each group. Then the CM current components of each group are separated by sweep frequency analysis and source extraction methods. The results are consistent with the theoretical analysis. Accordingly, proper strategies are given to reduce EMI according to the role of different SM group. Finally, the simulation results tested from a MMC grid-connected inverter system are conducted to confirm the validity of the analysis. © 2020 IEEE.

关键词： electromagnetic pulse

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Automatic Optimization of Static Electron Beam of Traveling Wave Tube with MFS and EOS

Automatic Optimization of Static Electron Beam of Traveling ...

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International Conference on Vacuum Electronics

作者： Xiao-Bing Wang Quan HU Xiao-Fang Zhu Luan-Feng Gao Yu-Lu Hu Li Liao Bin Li National Key Laboratory of Science and Technology on Vacuum Electronics Key Laboratory of Large-Scale Electromagnetic Industrial Software Ministry of Education School of Electronic Science and Engineering University of Electronic Science and Technology of China Chengdu P. R. China Shenzhen Institute for Advanced Study UESTC Shenzhen P. R. China

ISBN: (数字)9798350348705

ISBN: (纸本)9798350348712

The periodic permanent magnet (PPM) focusing system is an important part of the traveling wave tube (TWT), which is used to focus the electron beams to pass through the beam wave interaction region stably. However, PPM field optimization is time-consuming, and the optimization results are closely dependent on the designer's experience. The automatic optimization method introduced in this paper, which combines magnetic focusing simulator (MFS) and Electron optics simulator (EOS) to calculate PPM and electron gun, can greatly improve the design efficiency, and the example has shown good performance.

关键词： Electron beams Traveling wave tubes Earth Observing System Focusing Optimization methods Electron optics Electron guns Permanent magnets Vacuum electronics Electron sources

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Chronological Operation Simulation for Power System with Peak Regulation Ancillary Service Market in China: Formulation, Solving, and Validation

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SSRN 2022年

作者： Wei, Lishen Ai, Xiaomeng Fang, Jiakun Lou, Yixuan Liao, Shiwu Wen, Jinyu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China TODE Co. Ltd. Nanjing210046 China

Peak regulation ancillary service market (PRSM) is an emerging and effective mechanism for renewable energy accommodation in China, especially under Carbon Neutral. To comprehensively analyze its long-term impact on the power system, a chronological operation simulation (COS) model is proposed. Besides, the computational-burden balancing technique based on the time-domain decomposition is developed to improve the computational efficiency of COS. The real-world northeast China power system with PRSM has been analyzed. Case studies validate the simulation with published statistical data and demonstrate the accuracy. Besides, 52.16% computation time is reduced compared to the widely used rolling horizon method. The necessity of PRSM for renewable energy accommodation is also verified through chronological simulation. The relationship between peak regulation costs and renewable energy penetration is also given, which demonstrates its applicability. © 2022, The Authors. All rights reserved.

关键词： Computational efficiency

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Unravelling biosynthesis and biodegradation potentials of microbial dark matters in hypersaline lakes

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Environmental Science and Ecotechnology 2024年第4期20卷 177-188页

作者： Zhiguang Qiu Yuanyuan Zhu Qing Zhang Xuejiao Qiao Rong Mu Zheng Xu Yan Yan Fan Wang Tong Zhang Wei-Qin Zhuang Ke Yu School of Environment and Energy Peking University Shenzhen Graduate SchoolShenzhen518055China AI for Science(AI4S)-Preferred Program Peking UniversityShenzhen518055China Southern University of Sciences and Technology Yantian Hospital Shenzhen518081China Institute of Biomedicine and Biotechnology Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen518055China State Key Laboratory of Isotope Geochemistry CAS Center for Excellence in Deep Earth ScienceGuangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou510640China School of Atmospheric Sciences Sun Yat-sen UniversitySouthern Marine Science and Engineering Guangdong Laboratory(Zhuhai)Zhuhai519082China Department of Civil Engineering University of Hong Kong999077Hong KongChina Department of Civil and Environmental Engineering Faculty of EngineeringUniversity of AucklandNew Zealand

Biosynthesis and biodegradation of microorganisms critically underpin the development of biotechnology,new drugs and therapies,and environmental ***,most uncultured microbial species along with their metabolic capacities in extreme environments,remain *** we unravel the metabolic potential of microbial dark matters(MDMs)in four deep-inland hypersaline lakes in Xinjiang,*** metagenomic binning,we uncovered a rich diversity of 3030 metagenomeassembled genomes(MAGs)across 82 phyla,revealing a substantial portion,2363 MAGs,as previously unclassified at the genus *** unknown MAGs displayed unique distribution patterns across different lakes,indicating a strong correlation with varied physicochemical *** analysis revealed an extensive array of 9635 biosynthesis gene clusters(BGCs),with a remarkable 9403 being novel,suggesting untapped biotechnological ***,some MAGs from potentially new phyla exhibited a high density of these *** biosynthesis,our study also identified novel biodegradation pathways,including dehalogenation,anaerobic ammonium oxidation(Anammox),and degradation of polycyclic aromatic hydrocarbons(PAHs)and plastics,in previously unknown microbial *** findings significantly enrich our understanding of biosynthesis and biodegradation processes and open new avenues for biotechnological innovation,emphasizing the untapped potential of microbial diversity in hypersaline environments.

关键词： Biosynthesis Biodegradation Hypersaline lakes Metagenome-assembled genomes Microbial dark matters

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Fabrication and Mechanical Properties of Micro/Nano-Crystalline Layers in M50nil Carburized Steel

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SSRN 2024年

作者： Ding, Zifeng Guo, Jiaxu Niu, Junbo Zhou, Lina Zhang, Xinghong Ma, Xinxin State Key Laboratory of Advanced Welding & Joining Harbin Institute of Technology Harbin150001 China School of Materials Science & Engineering Harbin Institute of Technology Harbin150001 China Harbin Institute of Technology China

To enhance the wear resistance of carburized M50NiL steel, this study introduces a method for refining the grains in carburized layer to a micro/nano-scale. The method involves extending the carburization time to ensure the formation of large M7C3 carbides at grain boundaries, and adjusting the quenching temperature to facilitate the particle-stimulated nucleation (PSN). The process promoted the recrystallization of the residual austenite (RA), together with the subgrains unexpectedly discovered, successfully achieving the grain refinement. In this paper, the formation mechanism of recrystallization and subgrains are discussed based on interfacial energy model and first principles calculation. The results indicate that recrystallization is driven by the release of energy at the interface between M7C3 carbides and the matrix during quenching, while the formation of subgrain boundaries is due to the reduction of fault energy in the RA, which caused by the increase of C content, promotes the dislocation movement and entanglement. Furthermore, the effects on hardness and wear resistance of micro/ nano-crystalline region (MNCR) were investigated. The results show that MNCR after complete carburizing heat treatment has abundant dispersed carbides and refined martensite, which led to an approximate 15HV1 increase in the hardness, and exhibited nearly a 50% reduction in wear loss. © 2024, The Authors. All rights reserved.

关键词： Wear resistance

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Effect of N Plasma Immersion Ion Implantation (N-Piii) on the Microstructure and Mechanical Properties of 8cr4mo4v Steel

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SSRN 2024年

作者： Guo, Jiaxu Ding, Zifeng Zhou, Lina Miao, Bin Ma, Xinxin Ma, Fang State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin150001 China School of Materials Science & Engineering Harbin Institute of Technology Harbin150001 China Harbin Institute of Technology China

8Cr4Mo4V steel was treated by nitrogen plasma immersion ion implantation (N-PIII) under various implantation energies in this study, while the microstructure and mechanical properties were analyzed. The results revealed that the surface of the samples after N-PIII exhibited etching morphology due to the bombardment of ions. The depth of the nitrogen ion-implanted layer increased with higher implantation energy. The main form of existence of nitrogen in the implanted layer were as a solute in the martensite lattice and in the form of carbonitrides with alloying elements. The surface residual stress of the samples initially increased and then decreased with rising implantation energy. There was a significant enhancement in surface hardness, and the wear resistance also markedly improved after N-PIII. © 2024, The Authors. All rights reserved.

关键词： Microstructure

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Low temperature CaH2-assisted molten salt synthesis of ultrafine high entropy alloy powders for CO catalytic oxidation

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Journal of Alloys and Compounds 2025年 1032卷

作者： Zhang, Huibin Zhang, Yilin Guo, Fei Kang, Jiangang Liu, Zhengzheng Zhang, Lei Cao, Huazhen Yu, Linping He, Xubin Zheng, Guoqu College of Materials Science and Engineering Zhejiang University of Technology Hangzhou310014 China State Key Laboratory of Advanced Separation Membrane Materials Zhejiang University of Technology Hangzhou310014 China State Key Laboratory of Powder Metallurgy Central South University Changsha410083 China School of Chemistry and Chemical Engineering Changsha University of Science and Technology Changsha410114 China Zhejiang Longsheng Group Co. Ltd Shaoxing312000 China

Flexible combination of elements in high-entropy alloys paves the way for new catalyst material design. However, developing ultrafine high-entropy alloy powder catalyst with high specific surface is still challenging. This study introduced a new method for synthesizing ultrafine alloy powders via solution combustion followed by CaH2-assisted molten salt reduction. In optimized condition, the well-reduced metal powders with uniform composition and high specific surface area can be obtained. The synthesized FeCoNiCu HEA powder catalyst was evaluated for CO catalytic oxidation. It achieved 100 % CO conversion efficiency at 140°C and showed well stability in prolonged tests. First-principles calculations confirmed the synergistic effects of multielement combination. This work provides a universal approach for the rapid preparation and verification of multicomponent alloy powder catalyst with high specific surface area. © 2025 Elsevier B.V.

关键词： Powder metals

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Microwave-assisted acid-induced formation of linker vacancies within Zr-based metal organic frameworks with enhanced heterogeneous catalysis

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Chinese Chemical Letters 2021年第2期32卷 787-790页

作者： Yu Liang Chenhui Li Lanjun Chen Jia Huo Mohammed Loubidi Yangyang Zhou Yanbo Liu State Key Laboratory of Chem/Bio-sensing and Chemometrics College of Chemistry and Chemical Engineering.Hunan UniversityChangsha 410082China Hunan Provincial Key Laboratory of Advanced Materials for New Energy Storage and Conversion.Hunan University of Science and Technology Xiangtan 411201China

Herein,we report a microwave-assisted acid-induced post-treatment method for the formation of linker vacancies within Zr-based metal organic frameworks(Zr-MOFs).The number of linker vacancies can be easily regulated with this method by changing the concentration of the HCl solution and the duration of microwave *** optimized defective UiO-66 showed higher linker defects with a higher specific surface area and thermal *** results of the catalytic cyclization of citronella showed that the Zr-MOFs with more defects exhibited enhanced catalytic *** work may provide a new method for the creation of defective MOFs with high activity and stability.

关键词： Metal-organic frameworks Microwave Acid etching Linker vacancy Stability Heterogeneous catalysis

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