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Single-atom electrocatalysts for lithium-sulfur chemistry:Design principle,mechanism,and outlook

Carbon Energy 2023年第4期5卷 13-41页

作者： Yingze Song Luwei Zou Chaohui Wei Yu zhou Yue Hu State Key Laboratory of Environment‐Friendly Energy Materials Tianfu Institute of Research and InnovationSchool of Materials and ChemistrySouthwest University of Science and TechnologyMianyangSichuanPeople's Republic of China Yangtze Delta Region Institute(Huzhou) University of Electronic Science and Technology of ChinaHuzhouPeople's Republic of China State Key Laboratory of Powder Metallurgy Hunan Key Laboratory of Nanophotonics and DevicesSchool of Physics and Electronicspowder Metallurgy Research InstituteCentral South UniversityChangshaPeople's Republic of China Key Laboratory of Carbon Materials of Zhejiang Province College of Chemistry and Materials EngineeringWenzhou UniversityWenzhouPeople's Republic of China

Lithium-sulfur batteries(LSBs)have been regarded as one of the promising candidates for the next-generation“lithium-ion battery beyond”owing to their high energy density and due to the low cost of ***,the main obstacles encountered in the commercial implementation of LSBs are the notorious shuttle effect,retarded sulfur redox kinetics,and uncontrolled dendrite ***,single-atom catalysts(SACs),which have ultrahigh catalytic efficiency,tunable coordination configuration,and light weight,have shown huge potential in the field of LSBs to *** review summarizes the recent research progress of SACs applied as multifunctional components in *** design principles and typical synthetic strategies of SACs toward effective Li–S chemistry as well as the working mechanism promoting sulfur conversion reactions,inhibiting the lithium polysulfide shuttle effect,and regulating Li+nucleation are comprehensively *** future directions in terms of research on SACs for the realization of commercially viable LSBs are also outlined.

关键词： design principle lithium-sulfur chemistry mechanism single-atom electrocatalyst

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An Energy Efficient Motion Controller Based on SLCP for the Electrically Actuated Quadruped Robot

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Journal of Bionic Engineering 2020年第2期17卷 290-302页

作者： Tianfa Li Lelai zhou Yibin Li Hui Chai Kun Yang School of Control Science and Engineering Center for RoboticsShandong UniversityJinan 250061China

Energy efficiency has been the focus of quadruped robot *** the energy loss caused by the DC motor can contribute to the walking efficiency of electrically actuated quadruped *** works have focused on the quadruped mechanisms or actuations such as the Series Elastic Actuation(SEA).This work proposes a better efficient controller to perform the stable 5 m·s-1 movements of quadruped *** dynamic model of the electrically actuated leg is established by Lagrangian *** energy efficiency of the DC motors in the electrically actuated quadruped robot is formulated as an optimization *** Stochastic Linear Complementarity Problem(SLCP)and sinusoidal pulse force are proposed to reduce the energy consumption at the *** Bemstein polynomials are used for planning a quasi-elliptic foot motion *** stability and energy efficiency of the proposed controller are verified with computer simulation and an actual single leg robot *** with other works,the proposed controller performs the optimal Cost of Transport(COT).

关键词： bionic quadruped robots Stochastic Linear Complementarity Problem sinusoidal pulse force quasi-elliptic trajectory

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Domain decomposition based on the spectral element method for frequency-domain computational elastodynamics

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Science China Earth Sciences 2021年第3期64卷 388-403页

作者： Linlin SHI Mingwei ZHUANG Yuanguo zhou Na LIU Qinghuo LIU Institute of Electromagnetics and Acoustics and Key Laboratory of Electromagnetic Wave Science and Detection Technology Xiamen UniversityXiamen 361005China The Fifth Electronics Research Institute of Ministry of Industry and Information Technology Guangzhou 510610China College of Communication and Information Engineering Xi’an University of Science and TechnologyXi’an 710054China Department of Electrical and Computer Engineering Duke UniversityDurhamNC 27708USA

We propose a domain decomposition method based on the spectral element method(DDM-SEM)for elastic wave computation in frequency *** combines the high accuracy of the spectral element method and the high degree of parallelism of a domain decomposition technique,which makes this method suitable for accurate and efficient simulations of large scale problems in *** the DDM-SEM,the original large-scale problem is divided into a number of well designed *** use the spectral element method independently for each subdomain,and the neighboring subdomains are connected by a frequency-domain version of Riemann transmission condition(RTC)for elastic *** the proposed method,we can employ the non-conforming meshes and different interpolation orders in different subdomains to maximize the *** separating the internal and boundary unknowns of each subdomain,an efficient and naturally parallelizable block LDU direct solver is developed to solve the final system *** experiments verify its accuracy and efficiency,and show that the proposed DDM-SEM can be a promising numerical tool for accurately and effectively solving large and multi-scale problems of elastic *** is potentially valuable for the frequency domain seismic inversion where multiple source illuminations are required.

关键词： Elastic waves Domain decomposition Spectral element method Frequency domain Numerical simulations

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A novel variable topology design for a multi-flexible ejection mechanism

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Defence Technology（防务技术） 2020年第2期16卷 432-438页

作者： Hao Liu Jun zhou Zong-lai Mo Shi-wei Zhang School of Astronautics Northwestern Polytechnical UniversityXi'an710072China School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing210094China Luoyang Opto-Electro Technology Development Center 471009China

The airborne missile launch mechanism often subjects to significant deformations induced by the large ejection force during high-speed actuations in missile ejection process,leading to a substantial deviation of separation parameters from designed values that threats safety of the *** study proposes a novel variable topology design for launch mechanism,achieved via a Prsmatic-Revolute-Revolute pair(PR-R)motion formed by the structural gap with a specific *** enables launch mechanism variability during missile ejection process and optimizes the ejection force given by the front and back ejection arms,and greatly optimizes the separation parameters during missile *** kinetics simulation analysis is conducted under working conditions of the original ejection mechanism and the novel mechanism with variable topology design,*** results show that the novel variable topology design is more befitting for the launch process in terms of system safety and controllability,effectively improving the separation posture,restraining the flexible effect of the mechanism,and fulfilling the effectiveness of the design value of multi-rigid body.

关键词： Variable topology Gap dynamics Multi-flexible body Flexible control Ejection mechanism

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Experimental Study on the Reduction Effect of Pit Texture on Disassembly Damage for Interference Fit

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Chinese Journal of Mechanical Engineering 2023年第2期36卷 249-260页

作者： Dan zhou Yi Xu Xin Gao Haihong Huang Songjiang Lv Key Laboratory of Green Design and Manufacturing in Machinery Industry Hefei University of TechnologyHefei 230009China CRRC Nanjing Puzhen Co.Ltd Nanjing 210031China

After remanufacturing disassembly,several kinds of friction damages can be found on the mating surface of interference *** damages should be repaired and the cost is closely related to the severity of *** by the excellent performance of surface texture in wear reduction,5 shapes of pit array textures are added to the specimens’surface to study their reduction effect of disassembly damage for interference *** results of disassembly experiments show that the order of influence of texture parameters on disassembly damage is as follows:equivalent circle diameter of single texture,texture shape and texture surface *** influence of equivalent circle diameter of single texture and texture shape are obviously more significant than that of texture surface *** circular texture with a surface density of 30%and a diameter of 100μm shows an excellent disassembly damage reduction effect because of its perfect ability of abrasive particle *** the probability of disassembly damage formation and evolution is also relatively small on this kind of textured ***,the load-carrying capacity of interference fit with the excellent texture is confirmed by load-carrying capacity *** results show that the load-carrying capacity of the excellent texture surface is increased about 40%compared with that of without *** research provides a potential approach to reduce disassembly damage for interference fit.

关键词： Remanufacturing Interference fit Disassembly damage Surface texture Load-carrying capacity

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Construction of bimetallic Pt-Pd/CeO_(2)-ZrO_(2)-La_(2)O_(3) catalysts with different Pt/Pd ratios and its structure-activity correlations for three-way catalytic performance

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Journal of Rare Earths 2023年第6期41卷 896-904,I0004页

作者： Kai Chen Jie Wan Ting Wang Qi Sun Renxian zhou Institute of Catalysis Zhejiang UniversityHangzhou 310028China Energy Research Institute Nanjing Institute of TechnologyNanjing 211167China School of Environmental Engineering Nanjing Institute of TechnologyNanjing 211167China

A series of Pt-Pd bimetallic catalysts supported on CeO_(2)-ZrO_(2)-La_(2)O_(3) mixed oxides were synthesized through the conventional impregnation ***-way catalytic performance evaluations along with detailed physio-chemical characterizations were carried out to establish possible structure-activity *** show that on the one hand,different Pt/Pd ratios can strongly affect the TWC behaviors of Pt-Pd/CZL catalysts by modulating the synergistic effect between Pt and *** the other hand,higher Pt/Pd ratio also favors better dispersion of precious *** improved precious metals(PM)dispersion can promote the metal-support interaction and increase the surface oxygen vacancies concentration,thereby raising the dynamic oxygen storage/release capacity,improving the redox ability as well as enha ncing the thermal stability of the Pt-Pd/CZL ***,the stro ng metal-support interaction can augment surface oxygen vacancy concentration,thereby benefiting low temperature CO and NO reaction via augmented NOxadsorption and nitrate conversion.

关键词： Three-way catalyst Bimetallic Metal-support interaction Dispersion Dynamic oxygen storage/release capacity Rare earths

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An action-based Markov chain modeling approach for predicting the window operating behavior in office spaces

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Building Simulation 2021年第2期14卷 301-315页

作者： Xin zhou Tiance Liu Da Yan Xing Shi Xing Jin School of Architecture Southeast UniversityNanjingJiangsu Province210096China School of Architecture Tsinghua UniversityBeijing100084China

Reliable energy and performance prediction for building design and planning is important for newly-designed or retrofitted *** operating behavior has an important influence on the ventilation and energy consumption of these buildings under different realistic ***,quantitatively describing this behavior and constructing a prediction model are *** this work,an action-based Markov chain modeling approach for predicting window operating behavior in office spaces was *** summer measurement data(2016 and 2018)were used to verify the accuracy and validity of the modeling *** opening rate,outdoor temperature,time distribution,and on-off curve were proposed as four inspection *** study also compared the prediction performance between the action-based Markov chain modeling approach with the state-based Markov chain modeling approach,which is the most popular modeling approach to model occupant window operating *** study proved that the yearly variation of occupants’behavior performed a form of action that remained unchanged during a certain ***,the results also proved that the action-based Markov chain modeling approach can reflect the actual window operating behavior accurately within an open-plan office,which is a beneficial supplement for energy-consumption simulation software in a window-state prediction *** state-based Markov chain modeling approach showed better stability and accuracy in terms of the opening rate,whereas the action-based Markov chain modeling approach showed good consistency with the measurement data in the on-off curves and in situations with little *** the on-off curves,the accuracy of action-based modeling approach in the prediction of window open-state is 20%higher.

关键词： window operating behavior stochastic-numerical model action-based modeling approach stochastic model verification

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Dynamic evolution of Co species and morphological reconstruction on Co-N-C during the nitrate reduction reaction in neutral solution

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Nano Research 2025年第1期18卷 164-172页

作者： Yuanlin Fu Xiaoting Yang Ya Yu Kang zhou Xiaoyang Ye Aoxiang Zhang Xiaojiao Hou Bingbing Chen Fuqiang Fan Yuhang Li Yu Fu Department of Chemistry College of SciencesNortheastern UniversityShenyang 110819China Department of Physical Education Shen Yang Institute of Science and TechnologyShenyang 110167China Sungrow Power Supply Co. Ltd.Hefei 230088China

The electrochemical nitrate reduction reaction(eNO_(3)^(-)RR)is considered an effective approach for converting nitrate-containing wastewater to *** adsorption and activation of NO_(3)^(-)is the critical step for many materials and the high energy barrier inhibits the continuation of the reduction *** Co nanoparticles encapsulated in the carbon layer we prepared spontaneously react with NO_(3)^(-)and the resulting Co^(2+)is then reduced by electroreduction to Co^(0),which circulates *** resulted in overcoming the energy input required for NO_(3)^(-)adsorption and conversion,thereby increasing the catalytic *** the same time,the morphology of the catalyst reconstructed from a dodecahedron to an interwoven nanosheet structure and the increased surface area also gives it better *** obtained Co(OH)_(2)@Co-N-C has an excellent eNO_(3)^(-)RR of 2774.7μg·h^(-1)·cm^(-2)with a Faraday efficiency of 81.4%in neutral *** the same time,the material-modified electrode can run stably for more than 100 *** work provides a new idea for the design of Co-based catalysts for eNO_(3)^(-)RR.

关键词： electrochemical nitrate reduction reaction Co-based catalyst dynamic evolution of Co species morphological reconstruction

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政府部门包容性氛围建设的组态路径--基于模糊集定性比较分析

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长白学刊 2025年第1期 58-71页

作者：柯江林张继争周璇北京师范大学政府管理学院北京100875

在我国政府部门干部构成日益多样化的背景下,如何营造包容性氛围以充分发挥各类人员的优势成为理论和实践关注的重要问题。当前有关包容性氛围前因的研究多囿于传统定量研究范式探讨单一要素的独立“净效应”。本研究认为包容性氛围的... 详细信息

在我国政府部门干部构成日益多样化的背景下,如何营造包容性氛围以充分发挥各类人员的优势成为理论和实践关注的重要问题。当前有关包容性氛围前因的研究多囿于传统定量研究范式探讨单一要素的独立“净效应”。本研究认为包容性氛围的建设需要多种组织要素之间的相互依赖与共同作用,故采用模糊集定性比较分析(fsQCA)方法,基于组织氛围的五大条件性影响因素(组织背景,如规章制度;组织结构,如岗位分配;组织流程,如招聘选拔;物理环境,如硬件设施;价值观和行为规范,如价值观念),通过对474个干部的问卷调查收集47个政府单位样本,探索了包容性氛围多要素耦合的建设路径。研究发现:第一,五大条件性影响因素中单独各要素不构成产生强和弱包容性氛围的必要条件;第二,有两条能够产生强包容性氛围的组态,分别为“背景-流程-价值观”主导型和“结构-价值观”主导型;第三,有一条产生弱包容性氛围的组态,为“结构-环境-价值观”缺失型。研究结果为政府部门应如何营造包容性氛围提供了决策参考。

关键词：包容性氛围干部队伍建设模糊集定性比较分析组态视角

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High-performance spherical LiVPO4F/C cathode enabled by facile spray pyrolysis

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Science China(Technological Sciences) 2020年第12期63卷 2729-2734页

作者： DING XiaoBo zhou YongMao YAN GuoChun LI JiaYi WANG JieXi School of Metallurgy and Environment Central South UniversityChangsha 410083China Middle School Attached to Central South University Changsha 410083China State Key Laboratory for Powder Metallurgy Central South UniversityChangsha 410083China

LiVPO4F suffers problems of difficulty in synthesis and poor conductivity. To solve these,herein sub-micro spherical LiVPO4F/C is synthesized from a highly-reactive hollow VPO4/C sphere that is derived from a facile and fast spray pyrolysis for the first time. Uniform carbon coating layer with a thickness of 5–8 nm is observed on the surface of the particles,helping to improve the electronic conductivity,suppress the particle growth and protect the particles from corrosion by the electrolyte. The particles are shaped as fine sub-micro spheres,which are beneficial for shortening the distance for Li+ transport. Rietveld refinement for the X-ray diffraction pattern of as-prepared sample shows high-purity triclinic LiVPO4F with an enlarged lattice volume,enabling faster Li+ transport in the prepared material. Accordingly,the resulted LiVPO4F/C demonstrates superior electrochemical properties,delivering 135.4,91.1 mA hg-1 at 1,40 C respectively,and remaining the capacity of 93.3 mA hg-1 after 500 cycles at 20 C with the retention of 95.0%. The method introduced here provides an efficient way to address the serious problems of preparing high-purity Li VPO4F with good conductivity.

关键词： lithium ion battery cathode material spray pyrolysis LiVPO4F carbon coating

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