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Universal design of three-dimensional porous graphene-iron based promotors for kinetically rationalized lithium-sulfur chemistry

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Journal of Energy Chemistry 2025年第1期100卷 192-200页

作者： Hua Gao Yunfeng Zhang Menglei Wang Ruoxuan Yang Shuai Feng Xuan Cao Yaping Zhang Zhongyuan Lu Yingze Song State Key Laboratory of Environment-Friendly Energy materials School of Materials and Chemistry Southwest University of Science and Technology School of material Science and Engineering Henan University of Technology college of Chemistry and Chemical Engineering Taishan University

Lithium-sulfur （Li-S） batteries are widely deemed to be one of the most potential candidates for future secondary batteries because of their remarkable energy ***,notorious polysulfide shuttling and retarded sulfur reaction kinetics pose significant obstacles to the further application of Li-S *** rationally designed highly active electrocatalysts can facilitate polysulfide conversion,the universal and scalable synthesis strategies need to be ***,a universal synthetic strategy to construct a series of three-dimensional （3D） porous graphene-iron （3DGr-Fe） based electrocatalysts involving 3DGr-FeP,3DGr-Fe3C,and 3DGr-Fe3Se4is exploited for manipulating the Li-S redox *** has been observed that the implementation of a 3D porous Gr architecture leads to the well-designed conductive networks,while the uniformly dispersed iron nanoparticles introduce an abundance of active sites,fostering the lithium polysulfide conversion,thereby bolstering the overall electrochemical *** Li-S battery with the 3DGr-Fe based electrocatalyst exhibits remarkable capacity retention of 94.8%upon 100 times at 0.2 ***,the soft-packaged Li-S pouch cell based on such a 3DGr-Fe electrocatalyst delivers superior capacity of 1060.71 mA h g-1and guarantees for the continuous 30 min work of fan *** investigation gives comprehensive insights into the design,synthesis,and mechanism of 3DGr-Fe based electrocatalysts with high activity toward efficient and durable Li-S batteries.

关键词： Lithium-sulfur battery Universal synthesis 3D graphene-iron based promotor Electrocatalysis

Effects of carbon content on the microstructure and tensile properties of a low-density steel

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International Journal of Minerals,Metallurgy and materials 2025年第2期32卷 391-401页

作者： Yongxuan Shang Mingyu Fan Shuyong Jiang Zhongwu Zhang Key Laboratory of Superlight materials and Surface Technology Ministry of EducationCollege of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001China State Key Laboratory of Metal material for Marine Equipment and Application Iron&Steel Research Institute of Ansteel Group CorporationAnshan 114009China

Carbon can change the phase components of low-density steels and influence the mechanical *** this study,a new method to control the carbon content and avoid the formation ofδ-ferrite by decarburization treatment was *** microstructural changes and mechanical characteristics with carbon content induced by decarburization were systematically ***-Jaoul(C-J)analysis was employed to examine the work hardening characteristics during the tensile *** decarburization by heat treatments,the carbon content within the austenite phase decreased,while Mn and Al were almost unchanged;this made the steel with full austenite transform into the austenite and ferrite dual ***,(Ti,V)C carbides existed in both matrix phase and the mole fraction almost the *** addition,the formation of other carbides *** loss induced a decrease in strength due to the weakening of the carbon solid *** the steel with the single austinite,the deformation mode of austenite was the dislocation planar glide,resulting in the formation of *** the dual-phase steel,the deformation occurred by the dislocation planar glide of austenite first,with the increase in strain,the cross slip of ferrite took place,forming dislocation cells in *** the late stage of deformation,the work hardening of austinite increased rapidly,while that of ferrite increased slightly.

关键词： low-density steels carbon content decarburization strengthening mechanisms work hardening behavior

Porous Organic Cage‑Based Quasi‑Solid‑State Electrolyte with Cavity‑Induced Anion‑Trapping Effect for Long‑Life Lithium Metal Batteries

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Nano-Micro Letters 2025年第2期17卷 376-386页

作者： Wei-Min Qin Zhongliang Li Wen‑Xia Su Jia‑Min Hu Hanqin Zou Zhixuan Wu Zhiqin Ruan Yue‑Peng Cai Kang Li Qifeng Zheng School of Chemistry South China Normal UniversityGuangzhou 510006People’s Republic of China Key Laboratory of Functional Metal‑Organic Compounds of Hunan Province College of Chemistry and Material ScienceHengyang Normal UniversityHengyang 421008People’s Republic of China Guangzhou Key Laboratory of Energy Conversion and Energy Storage materials Guangzhou 510006People’s Republic of China

Porous organic cages(POCs)with permanent porosity and excellent host–guest property hold great potentials in regulating ion transport behavior,yet their feasibility as solid-state electrolytes has never been testified in a practical ***,we design and fabricate a quasi-solid-state electrolyte(QSSE)based on a POC to enable the stable operation of Li-metal batteries(LMBs).Benefiting from the ordered channels and cavity-induced anion-trapping effect of POC,the resulting POC-based QSSE exhibits a high Li+transference number of 0.67 and a high ionic conductivity of 1.25×10^(−4) S cm^(−1) with a low activation energy of 0.17 *** allow for homogeneous Li deposition and highly reversible Li plating/stripping for over 2000 *** a proof of concept,the LMB assembled with POC-based QSSE demonstrates extremely stable cycling performance with 85%capacity retention after 1000 ***,our work demonstrates the practical applicability of POC as SSEs for LMBs and could be extended to other energy-storage systems,such as Na and K batteries.

关键词： Porous organic cage Cavity-induced anion-trapping Quasi-solid-state electrolyte Homogeneous Li+flux Lithium metal battery

A New Vanadium Phosphate Incorporating Copper-organonitrogen Ligand： Synthesis,Crystal Structure and Electrochemical Property

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Chinese Journal of Structural Chemistry 2016年第7期35卷 1115-1121页

作者：郑新芳韩占刚 college of Chemistry and Chemical Engineering and material Science Handan College college of Chemistry & material Science Hebei Normal University

A new phosphovanadate metal-organic complex Cu（mbpy）（VO2）（PO4）（1, mbpy = 5,5＇-dimethyl-2,2＇-dipyridyl） has been hydrothermally synthesized and structurally characterized. Single-crystal structure analysis reveals that compound 1 crystallizes in the monoclinic space group P21/c with a = 7.6640（4）, b = 18.8832（10）, c = 10.1893（5） A, β = 94.782（1）°, V = 1469.47（13）A^3, Z = 4, Mr = 425.69, Dc = 1.924 g/cm^3, F（000） = 852, μ（Mo Kα） = 2.224 mm-1, R = 0.0291 and w R = 0.0980. The crystal structure of 1 features a one-dimensional framework constructed by inorganic {Cu（VO2）（PO4）}∞ neutral chain and organic mbpy ligands. The electrochemical property of compound 1 modified carbon paste electrode has also been investigated.

关键词： phosphovanadate copper polymer electrochemistry

Research on microcapsules of phase change materials

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Rare Metals 2006年第z1期25卷 393-399页

作者： DAI Xia SHEN Xiaodong material college of Nanjing University of Technology Nanjing 210009 China Material College of Nanjing University of Technology Nanjing 210009 China

Microcapsule technology is a kind of technology wrapping the solid or liquid into minute-sized particles within the field of micrometer or millimeter with film forming materials. This thesis introduces microcapsule technology of phase change materials and its main functions and the structural composition, preparation methods and characterization technology of microcapsule of phase change materials. The microcapsule of phase change materials is small in size and its temperature remains unchanged during the process of heat absorption and heat release. It is of great value in research and application prospect due to these characteristics.

关键词： phase change material microcapsule phase change material surface polymerization preparation

Influence of Pr on Magnetic Properties and Microstructure of Melt-Spun(Nd_(1-x)Pr_x)_(10.5)(FeCoZr)_(83.5)B_6 Alloy

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Journal of Rare Earths 2004年第6期22卷 808-811页

作者：查五生刘颖高升吉涂铭旌 college of material Science & Engineering Sichuan University college of material Science & Engineering Xihua University Chengdu 610039 China college of material Science & Engineering Sichuan University Chengdu 610065 China

The influence of Pr on thermal stability, microstructure, and magnetic properties of melt-spun (Nd1-xPrx)(10.5)(FeCoZr)(83.5)B-6(x = 0, 0.2, 0.4, 0.6, 0.8, 1.0) alloy was investigated. By sub-overquenching to get the mixture of amorphous and fine crystallites and post annealing under the optimum conditions, bonded magnets with the best magnetic properties were prepared. With the increase of Pr content, H-ci increases, but B-r decreases. (BH)(max) of magnets bonded with 3.25% (mass fraction) epoxy reaches the maximum of 70.6 kJ .m(-3) at x = 0.6 similar to 0.8. Substitution of Pr for Nd causes the crystallization temperature and crystallization energy to decrease. This thermal stability difference results in that (Nd0.8Pr0.8)(10.5)(FeCoZr)(83.5)B-6 alloy has a rougher and more inhomogeneous microstructure than that of (Nd(0.8)Pro(0.2))(10.5)(FeCoZr)(83.5)B-6 alloy, furthermore, leads to the decrease of B-r with the increase of Pr content.

关键词： metal materials permanent magnets Pr content thermal stability magnetic properties microstructure rare earths

Processing maps and hot working mechanisms of supercritical martensitic stainless steel

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Journal of Central South University 2016年第7期23卷 1556-1563页

作者：王梦寒王瑞孟烈王根田 college of material Science and Engineering Chongqing University

The hot working mechanism of 2Cr11 MolVNbN steel was investigated by means of compression tests at temperatures of900-1150 ℃ and strain rates of 0.005-5 s^(-1).At strains of 0.2,0.3,0.5 and 0.7,the relationship among strain rate sensitivity,power dissipation efficiency and instability parameter under different conditions were *** dissipation maps and instability maps at different strains were *** optimal and the instable deformation regimes were established by the processing maps based on the dynamic material *** processing maps were developed for the typical strains of 0.2,0.3,0.5 and 0.7,predicting the instability regions occurring at high strain rate more than 0.05 s^(-1),which should be avoided during hot *** optimized processing parameters for hot working of 2CrllMolVNbN supercritical stainless steel were temperatures of 1080-1120 ℃ and strain rates of 0.005-0.01 s^(-1).

关键词： martensitic stainless steel processing map strain-rate sensitivity hot deformation

Multi-objective optimization of stamping forming process of head using Pareto-based genetic algorithm

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Journal of Central South University 2015年第9期22卷 3287-3295页

作者：周杰卓芳黄磊罗艳 college of material Science and Engineering Chongqing University

To obtain the optimal process parameters of stamping forming, finite element analysis and optimization technique were integrated via transforming multi-objective issue into a single-objective issue. A Pareto-based genetic algorithm was applied to optimizing the head stamping forming process. In the proposed optimal model, fracture, wrinkle and thickness varying are a function of several factors, such as fillet radius, draw-bead position, blank size and blank-holding force. Hence, it is necessary to investigate the relationship between the objective functions and the variables in order to make objective functions varying minimized simultaneously. Firstly, the central composite experimental(CCD) with four factors and five levels was applied, and the experimental data based on the central composite experimental were acquired. Then, the response surface model(RSM) was set up and the results of the analysis of variance(ANOVA) show that it is reliable to predict the fracture, wrinkle and thickness varying functions by the response surface model. Finally, a Pareto-based genetic algorithm was used to find out a set of Pareto front, which makes fracture, wrinkle and thickness varying minimized integrally. A head stamping case indicates that the present method has higher precision and practicability compared with the "trial and error" procedure.

关键词： stamping forming heads finite element analysis central composite experimental design response surface methodology multi-objective genetic algorithm

Modeling on dynamic recrystallization of aluminium alloy 7050 during hot compression based on cellular automaton

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Journal of Central South University 2016年第3期23卷 497-507页

作者：李军超谢志远李松蒲臧艳艳 college of material Science and Engineering Chongqing University

The dynamic recrystallization(DRX) process of hot compressed aluminium alloy 7050 was predicted using cellular automaton(CA) combined with topology deformation. The hot deformatation characteristics of aluminium alloy 7050 were investigated by hot uniaxial compression tests in order to obtain the material parameters used in the CA model. The influences of process parameters(strain, strain rate and temperature) on the fraction of DRX and the average recrystallization grain(R-grain) size were investigated and discussed. It is found that larger stain, higher temperature and lower strain rate(less than 0.1 s^(–1)) are beneficial to the increasing fraction of DRX. And the deformation temperature affects the mean R-grain size much more greatly than other parameters. It is also noted that there is a critical strain for the occurrence of DRX which is related to strain rate and temperature. In addition, it is shown that the CA model with topology deformation is able to simulate the microstructural evolution and the flow behavior of aluminium alloy 7050 material under various deformation conditions.

关键词： cellular automaton dynamic recrystallization aluminium alloy 7050 flow stress