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Urea-induced interfacial engineering enabling highly reversible aqueous zinc-ion battery

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Rare Metals 2024年第4期43卷 1599-1609页

作者： Bin-Rui Xu Quan-An Li Yong Liu Guang-Bin Wang Zi-He zhang feng-zhang ren School of Material Science and Engineering Henan University of Science and TechnologyLuoyang471023China School of Information Engineering Henan University of Science and TechnologyLuoyang471023China Longmen Laboratory Luoyang471023China Provincial and Ministerial Co-Construction of Collaborative Innovation Center for Non-Ferrous Metal New Materials and Advanced Processing Technology Luoyang471023China

Aqueous zinc-ion batteries(AZIBs)have been regarded as prospective rechargeable energy storage devices because of the high theoretical capacity and low redox potential of Zn ***,the uncontrollable formation of dendrites and the water-induced side reactions at the Zn/electrolyte interface,and the poor reversibility under a high current density(>2 mA·cm^(-2))and large area capacity(>2 mAh·cm^(-2))still limit the practical applications of ***,a strategy that can overcome these difficulties is urgently ***,we introduce an environmentally friendly and low-cost additive,namely urea,to the electrolyte of AZIBs to induce uniform Zn deposition and suppress the side *** of the adsorption behavior,electrochemical characterization,and observations of the morphology revealed the interfacial modification induced by urea on the Zn/electrolyte interface,demonstrating its huge potential in ***,the long-term cycling stability(over2100 h)of a Zn/Zn symmetric cell under a high current density of 5 mA·cm^(-2)and a capacity of 5 mAh·cm^(-2)was achieved with a 1 mol·L^(-1)ZnSO_(4)electrolyte with the urea ***,the assembled Zn/NH_4V_4O_(10)full cell with urea exhibited excellent cycling performance and an outstanding average Coulombic efficiency of 99.98%.These results indicate that this is a low-cost and effective additive strategy for realizing highly reversible AZIBs.

关键词： Zn anode Urea additive Interface engineering Dendrite growth Side reaction

Effect of microstructure and mechanical properties on cutting force of different cast irons with similar tensile strength

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China Foundry 2019年第3期16卷 177-183页

作者： Jiang-zhuo ren Zong-liang Li Yi Xiong feng-jun Li feng-zhang ren Alex A. Volinsky Faculty of Engineering University of Alberta Edmonton T6G 1H9 CA School of Materials Science and Engineering Henan University of Science and Technology Luoyang 471023 China First Tractor Co. Ltd. Luoyang 471004 China Department of Mechanical Engineering University of South Florida Tampa FL33620 USA

Flake graphite iron, compacted graphite iron and spheroidal graphite iron with various tensile strengths were cast. They were selected and grouped according to roughly the same tensile strength, and then the main cutting force in each group was measured and compared. The microstructures of different cast irons were characterized. The relationship between the cutting force and microstructure was established. Results show that the graphite morphology in cast irons determines the strength. In order to obtain the same strength of the cast iron with sharply edged graphite, more or finer pearlite in the matrix is needed. Graphitic cast irons with high pearlite content and smaller pearlite interlamellar spacing have higher hardness. For the cast irons with different graphite morphologies, but almost the same tensile strength, the main cutting force is obviously different, along with the hardness. Harder cast irons have a greater cutting force, but the difference in cutting force is not proportional to hardness.

关键词： graphite cast irons cutting force tensile strength microstructure

Role of trivalent antimony in the removal of As, Sb, and Bi impurities from copper electrolytes

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International Journal of Minerals,Metallurgy and Materials 2013年第1期20卷 9-16页

作者： Fa-xin Xiao Dao Cao Jian-wei Mao Xiao-ni Shen feng-zhang ren School of Materials Science and engineering Henan University of Science and Technology Henan Key Laboratory of Advanced Nonferrous Metal Materials

The role of trivalent antimony was investigated in removing As, Sb, and Bi impurities from a copper electrolyte. Puri- fication experiments were carried out by adding a various concentrations of Sb（III） ions in a synthetic electrolyte containing 185 g/L sulfuric acid, 45 g/L Cu2＋, 10 g/L As, and 0.5 g/L Bi under stirring at 65℃ for 2 h. The electrolyte was filtered, and the structure, morphology and composition of the precipitate were analyzed by means of chemical analysis, scanning electron mi- croscopy （SEM）, X-ray diffraction （XRD）, transmission electron microscopy （TEM）, and IR spectroscopy. The precipitate is composed of irregular lumps which are agglomerated by fine dendritic and floccus particles, and it mainly consists of As, Sb, Bi, and O elements. Characteristic bands in the IR spectra of the precipitate are As-OX （X=As, Sb, Bi）, Sb-OY （Y=Sb, Bi）, O-As-O1 As-OH, Sb-OH, and O-H. The precipitate is a mixture of microcrystalline SbAsQ, （Sb,As）203, and amorphous phases. As, Sb, and Bi impurities are effectively removed from the copper electrolyte by Sb（III） ions attributing to these pre- cipitates.

关键词： copper metallurgy electrorefining electrolytes impurities removal antimony arsenic bismuth

Enhanced magnetic properties of SmCo/FeCo nanocomposite magnets by doping eutectic Sm-Ni alloy

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Rare Metals 2023年第6期42卷 1829-1835页

作者： Shi-Zhong An Xiao-Sen Li Wu-Hui Li Gui-Hong Lv feng-zhang ren School of Materials Science and Engineering Henan University of Science and TechnologyLuoyang471023China Henan Key Laboratory of Nonferrous Materials Science and Processing Technology Longmen LaboratoryProvincial and Ministerial Co-Construction of Collaborative Innovation Center for Non-Ferrous Metal New Materials and Advanced Processing TechnologyLuoyang471023China

In this work,we prepared SmCo/FeCo nanocomposite magnets with an enhanced magnetic performance by doping eutectic Sm-Ni *** magnets without Sm-Ni alloy,with a grain size of 5-12 nm and an average size of~ 9 nm,are composed of Sm_(2)Co_(17) phase and FeCo phase,leading to a relatively low remanence of 0.0365A·m^(2)·g^(-1) and coercivity of 0.15 T,*** doping 2.5 wt% Sm-Ni alloy,there is no obvious change on the grain size of SmCo/FeCo magnets.

关键词： magnets doping SmCo

Recent progress of two-dimensional metal-base catalysts in urea oxidation reaction

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Rare Metals 2024年第8期43卷 3607-3633页

作者： Qi-Xiang Huang Fang Wang Yong Liu Bi-Ying zhang Fang-Ya Guo Zhong-Qiu Jia Hao Wang Tian-Xiang Yang Hai-Tao Wu feng-zhang ren Ting-feng Yi School of Materials Science and Engineering Henan University of Science and TechnologyLuoyang 471000China School of Environmental Engineering and Chemistry Luoyang Institute of Science and TechnologyLuoyang 471023China Henan Province International Joint Laboratory of Materials for Solar Energy Conversion and Lithium Sodium Based Battery Luoyang 471023China School of Chemistry and Life Sciences Suzhou University of Science and TechnologySuzhou 215009China School of Materials Science and Engineering Northeastern UniversityShenyang110819China

Urea oxidation reaction(UOR)is an auxiliary water electrolysis hydrogen production technology developed in recent years to replace oxygen evolution reaction and reduce energy consumption,which can produce hydrogen more efficiently by low theoretical potential,reduce the average cost of electrochemical hydrogen production,and is a frontier research hotspot for renewable hydrogen ***-dimensional(2D)nanomaterials as electrocatalysts have many favorable potential,such as it can effectively reduce the resistivity of materials and increase the specific surface area with *** paper reviews the application of 2D materials in UOR in alkaline *** a cross-sectional comparison of various material performance data including overpotential,Tafel slope,electrochemical active surface area(ECSA)and it stability test was conducted,which could illustrate the differences between materials composed of different *** addition,the main challenges hindering the progress of research on 2D materials in urea electrocatalysis processes and promising materials in this field in future are summarized and *** is believed that this review will contribute to designing and analyzing highperformance 2D urea electrocatalysts for water splitting.

关键词： Water splitting Urea oxidation reaction Two-dimensional Transition metal compounds Noble/non-noble metals

Effect of annealing time on microstructure and mechanical properties of cryorolled AISI 310S stainless steel

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Journal of Iron and Steel Research International 2023年第3期30卷 548-556页

作者： Xue-kui Lian Yong Li Yi Xiong Yong-li Wu Shun Han Tian-tian He Chun-xu Wang feng-zhang ren Central Iron and Steel Research Institute Co. Ltd.Beijing 100081China School of Materials Science and Engineering Henan University of Science and TechnologyLuoyang 471023HenanChina Provincial and Ministerial Co-construction of Collaborative Innovation Center for Non-ferrous Metal New Materials and Advanced Processing Technology Luoyang 471023HenanChina

AISI 310S stable austenitic stainless steel was subjected to 90%cryorolling and then annealed at 800 ℃ for 2-60 *** effect of annealing time on the microstructure and mechanical properties was studied by optical microscopy,scanning electron microscopy,transmission electron microscopy,microhardness and tensile *** results show that the grain size of AISI 310S stainless steel is refined to the nanometer level after 90%cryorolling,and the grain size is approximately 20 *** the increase in annealing time,the degree of grain recrystallization occurs more fully and completely,as the grain begins to grow and then tends to *** strength and hardness of the annealed specimens decrease with increasing annealing time,while elongation tends to *** the annealing time is 10 min,the yield strength increases by about 2 times compared to that of the original austenite(unrolled),and the elongation is also above 20%,which is the best preparation process for ultra-fine grain austenitic stainless steel under this experimental *** the annealing time treatment increases,the fracture morphology changes from mixed quasi-cleavage and ductile fracture(after cryorolling)to ductile fracture(after annealing).

关键词： Austenitic stainless steel Cryorolling Annealing time Microstructure Mechanical property

Impacts of multiple laser shock processing on microstructure and mechanical property of high-carbon steel

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Journal of Iron and Steel Research International 2018年第4期25卷 469-475页

作者： Yi Xiong Tian-tian He Yan Lu Han-sheng Bao Yong Li feng-zhang ren Wei Cao Alex A. Volinsky School of Materials Science and Engineering Henan University of Science and Technology Luoyang 471023 Henan China Collaborative Innovation Center of Nonferrous Metals Luoyang 471023 Henan China Institute for Special Steels Central Iron and Steel Research Institute Beijing 100081 China Nano and Molecular Systems Research Unit University of Oulu 90014 Oulu Finland School of Mechanical and Automotive Engineering Anhui Polytechnic University Wuhu 241000 Anhui China Department of Mechanical Engineering University of South Florida Tampa FL 33620 USA

Multiple laser shock processing （LSP） impacts on microstructures and mechanical properties were investigated through morphological determinations and hardness testing. Microscopic results show that without equal channel angular pressing （ECAP）, the LSP-treated lamellar pearlite was transferred to irregular ferrite matrix and incompletely broken cementite particles. With ECAP, LSP leads to refinements of the equiaxed ferrite grain in ultrafine-grained microduplex structure from 400 to 150 nm, and the completely spheroidized cementite particles from 150 to 100 nm. Consequentially, enhancements of mechanical properties were found in strength, microhardness and elongations of samples consisting of lamellar pearlite and ultrafine-grained microduplex structure. After LSP, a mixture of quasi-cleavage and ductile fracture was formed, different from the typical quasi-cleavage fracture from the original lamellar pearlite and the ductile fracture of the microduplex structure.

关键词： Laser shock processing High-carbon steel Ultrafine-grained microduplex structure Mechanical property

Microstructure Evolution and Microhardness of Ultrafine-grained High Carbon Steel during Multiple Laser Shock Processing

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Journal of Iron and Steel Research International 2015年第1期22卷 55-59页

作者： Yi XIONG Tian-tian HE feng-zhang ren Peng-yan LI Lu-fei CHEN Alex A.VOLINSKY School of Materials Science and Engineering Henan University of Science and Technology Henan Collaborative Innovation Center of Non-ferrous Metal Generic Technology Institute of Metal Research Chinese Academy of Sciences Department of Mechanical Engineering University of South FloridaTampa FL 33620USA

Surface microstructure and microhardness of （ferrite＋ cementite） microduplex structure of the ultrafine- grained high carbon steel after laser shock processing （LSP） with different impact times were investigated by means of scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, X-ray diffraction （XRD） and microhardness measurements. Equiaxed ferrite grains were refined from 400 to 150 nm, and the cementite lamellae were fully spheroidized, with a decrease of the particle diameter from 150 to 100 nm as the impact times increased. The cementite dissolution was enhanced significantly. Correspondingly, the lattice parameter of α-Fe and microhard- hess increased with the impact times.

关键词： ultrafine-grained high carbon steel laser shock processing impact times microstructure microhardness

Molecular dynamics simulations of helium transport through inorganic mineral nanopores

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Science China Earth Sciences 2025年第1期68卷 237-252页

作者： Dandan SONG Ping GUAN Chi zhang Jiahao ren School of Earth and Space Sciences Peking University

Helium transport through nanoscale inorganic mineral pores and pore throats is essential for its overall migration. To elucidate helium's transport dynamics within nanopores, we employed equilibrium and non-equilibrium molecular dynamics simulations to investigate helium's static self-diffusion and pressure-driven flow in quartz slit-shaped nanopores. We also introduced water and various gases, including hydrogen, methane, ethane, nitrogen, and carbon dioxide, into the nanopores to assess their influence on helium transport. Our findings indicate minimal helium adsorption on quartz pore surfaces. Under conditions where the pore size is less than 5 nm and the pressure under 10 MPa, environmental factors markedly influence helium diffusion. Large pore sizes, high temperatures, and low gas pressures enhance helium desorption and facilitate faster diffusion. We observed a positive correlation between helium flow velocity and factors such as pore size, pressure gradient, and surface smoothness of the pores. Notably, the presence of pore water and carrier gases in quartz nanopores, which diffuse more slowly than helium, tends to reduce helium surface adsorption and slow its diffusion. Among the carrier gases studied, nitrogen showed similar adsorption capacity, diffusivity, and stability to helium, while carbon dioxide displayed the highest adsorption capacity and the slowest diffusion rate, markedly differing from helium. Based on the simulation results, we concluded that water and carrier gases primarily function as transport mediums in helium migration, moving together with helium. Nitrogen, which shares similar properties with helium, effectively assists in this co-migration process. Conversely, carbon dioxide, due to its high adsorption capacity and slow diffusion, tends to be lost during co-migration. As a result, gas reservoirs with high nitrogen levels and low carbon dioxide levels are more likely to have higher helium concentrations. Additionally, the smaller por

关键词： Helium transport Slit nanopores Molecular dynamics simulations Diffusion Flow carriers