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Effect of Co content on mechanical and corrosion properties of TiZrHfNiCuCo high-entropy shape memory alloy

materials Today Communications 2025年 47卷

作者： Yu Su Yanchun Zhao Huwen Ma Yunbo Lan Bo Jin Zhiqi Yu Tianzeng Liu Li Feng Peter K. Liaw State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals School of Materials Science and Engineering Lanzhou University of Technology Lanzhou 730050 PR China Wenzhou Pump and Valve Engineering Research Institute Lanzhou University of Technology Wenzhou 325105 PR China Department of Materials Science and Engineering University of Tennessee Knoxville TN 37996 USA

This study designed a TiNi-based high-entropy shape memory alloy, Ti 25 Zr 10 Hf 15 Ni 25 Cu 25-x Co x (x = 5, 10, 15 at%), using magnetic levitation water-cooled copper crucible melting and negative pressure copper mold suction casting. The compressive properties and superelasticity of Ti 25 Zr 10 Hf 15 Ni 25 Cu 15 Co 10 were investigated, and the effects of Cu and Co content adjustments on the alloy's corrosion behavior were studied. The results showed that, with increasing compressive strain, the residual strain increased from 3.26 % to 7.36 %, the elastic recovery increased from 4.42 % to 7.43 %, and the recovery rate decreased from 63.75 % to 56.73 %. In Hank's solution, as the Co content increased, the alloy's corrosion potential decreased, the diameter of the capacitive arc decreased, and the corrosion resistance of the alloy decreased. The Ti 25 Zr 10 Hf 15 Ni 25 Cu 20 Co 5 alloy demonstrated superior corrosion resistance in Hank's solution.

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In situ formation of ZnOx species for efficient propane dehydrogenation (vol 599, pg 234, 2021)

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NATURE 2022年第7893期601卷 E8-E8页

作者： Zhao, Dan Tian, Xinxin Doronkin, Dmitry E. Han, Shanlei Kondratenko, Vita A. Grunwaldt, Jan-Dierk Perechodjuk, Anna Vuong, Thanh Huyen Rabeah, Jabor Eckelt, Reinhard Rodemerck, Uwe Linke, David Jiang, Guiyuan Jiao, Haijun Kondratenko, Evgenii V. State Key Laboratory of Heavy Oil Processing China University of Petroleum Beijing P. R. China Leibniz-Institut für Katalyse e.V. Rostock Germany Key Laboratory of Materials for Energy Conversion and Storage of Shanxi Province Institute of Molecular Science Shanxi University Taiyuan P. R. China Institute of Catalysis Research and Technology and Institute for Chemical Technology and Polymer Chemistry Karlsruhe Institute of Technology (KIT) Karlsruhe Germany

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Porous surfur-doped hard carbon for excellent potassium storage

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Chinese Chemical Letters 2020年第1期31卷 223-226页

作者： Xuan Xie Shihan Qi Daxiong Wu Huaping Wang Fang Li Xiaoxin Peng Jinfeng Cai Jiaojiao Liang Jianmin Ma School of Physics and Electronics Hunan UniversityChangsha 410082China Yiyang Wanjingyuan Electronics Co. Ltd.Yiyang 413000China College of Traffic Engineering Hunan University of TechnologyZhuzhou 412008China Key Laboratory of Materials Processing and Mold(Zhengzhou University) Ministry of EducationZhengzhou UniversityZhengzhou 450002China State Key Lab of Chemical Engineering School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China

Hard carbon is promising anode for potassium-ion batteries(PIBs),however,the poor rate capability hinders its development as potential *** address this question,we design a sulfur-doped porous hard carbon(S-HC)for PIBs through the combination of structural design and composition *** as-designed S-HC exhibits a long cycling life with^191 mAh/g after 300 cycles at 1 A/g,and an excellent rate capability with^100 mAh/g at 5 A/g,which was attributed to its structural characteristics and *** S-HC demonstrates to be promising anode in the future.

关键词： Porous carbon Sulfur-doping Hard carbon Anode Potassium-ion battery

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Liquid Fluxional Ga Single Atom Catalysts for Efficient Electrochemical CO2Reduction

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Angewandte Chemie 2022年第3期135卷

作者： Dr. Zedong Zhang Jiexin Zhu Dr. Shenghua Chen Prof. Wenming Sun Prof. Dingsheng Wang Department of Chemistry Tsinghua University Beijing 100084 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 Hubei China Department of Chemistry Beijing Key Laboratory for Optical Materials and Photonic Devices Capital Normal University Beijing 100048 China

Precise design and tuning of the micro-atomic structure of single atom catalysts (SACs) can help efficiently adapt complex catalytic systems. Herein, we inventively found that when the active center of the main group element gallium (Ga) is downsized to the atomic level, whose characteristic has significant differences from conventional bulk and rigid Ga catalysts. The Ga SACs with a P, S atomic coordination environment display specific flow properties, showing CO products with FE of ≈92 % at −0.3 V vs. RHE in electrochemical CO 2 reduction (CO 2 RR). Theoretical simulations demonstrate that the adaptive dynamic transition of Ga optimizes the adsorption energy of the *COOH intermediate and renews the active sites in time, leading to excellent CO 2 RR selectivity and stability. This liquid single atom catalysts system with dynamic interfaces lays the foundation for future exploration of synthesis and catalysis.

关键词： CO2RR Fluxional Single Atom Catalysts Liquid Metal Ga

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Large-Scale Production of Spent Coffee Ground-Based Photothermal materials for High-Efficiency Solar-Driven Interfacial Evaporation

SSRN

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SSRN 2022年

作者： Shi, Congcan Zhang, Xue Nilghaz, Azadeh Wu, Zhenhua Wang, Tao Zhu, Bocheng Tang, Guiming Su, Bin Tian, Junfei State Key Laboratory of Pulp and Paper Engineering School of Light Industry and Engineering South China University of Technology Guangzhou510640 China China National Pulp and Paper Research Institute Co. Ltd. Beijing100102 China Institute for frontier Materials Deakin University Waurn PondsVIC3216 Australia State Key Laboratory of Material Processing and Die. Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology China Guangdong Ruipeng Material & Science Co. Ltd. Foshan528000 China

Solar-driven interfacial evaporation is an emerging technology with promising solutions towards water scarcity. Nevertheless, many challenges remain in realizing its implementation including inefficient utilization of thermal energy and difficult to scale production. Herein, we develop a simple, low-cost and scale-producible photothermal material for high-efficiency solar-driven interfacial evaporation, prepared by functionalizing the delignified spent coffee ground (D-SCG) with polypyrrole (PPy) via in-situ growth of PPy nanoparticles. The PPy modified D-SCG (PPy@D-SCG) performed high evaporation rate of 1.54 kg m -2 h -1 and solar-thermal energy conversion efficiency of 89.1% under 1 sun illumination. Furthermore, we designed a 3D solar evaporator fabricated by utilizing the 3D printing technique, which took the thermoplastic composite filaments combining PPy@D-SCG and polylactic acid (PLA) as raw materials. The 3D solar evaporator demonstrated higher water evaporation rate of 1.81 kg m -2 h -1 and photothermal conversion efficiency of 92.7% than the previous reports data of natural materials-base solar evaporator, with the potential applications in the purification of wastewater containing organic dyes and heavy metal ions. It is anticipated that the developed SCG employ as cost-effective scalable 3D photothermal materials for point-of-use water purification in real-world scenarios. © 2022, The Authors. All rights reserved.

关键词： Evaporation

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Hydrophobic interface layer improves the moisture tolerance and efficiency of ambient air-processed perovskite solar cells

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Fundamental Research 2024年

作者： Wanjie Yin Huiming Luo Ligang Yuan Yuxuan Sun Xiao Yang Longyan Zhang Yong Peng Qing-Song Jiang Faculty of Electronic Information Engineering Huaiyin Institute of Technology Huai'an 223003 China Institute for Materials Discovery University College London Malet Place London WC1E 7JE UK Key Laboratory for Optoelectronic Information Perception and Instrumentation of Jiangxi Province Key Laboratory of Nondestructive Testing Ministry of Education School of the Testing and Photoelectric Engineering Nanchang Hangkong University Nanchang 330063 China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Because perovskite films degrade quickly in humidity conditions, perovskite solar cells (PSCs) prepared in ambient air still show lower photovoltaic performance than those prepared in an inert atmosphere. Here, we offer an effective interfacial passivation method via a poly(N-vinylcarbazole) (PVK) layer to protect perovskite films and prevent their moisture degradation under ambient air conditions. The power conversion efficiency of the PVK-based champion PSC is 23.27% and is higher than that of the control PSC (20.94%). Meanwhile, the PVK-based perovskite films exhibit a large water contact angle, which is attributed to the hydrophobic nature of the uniformly deposited PVK layer. This leads to no significant effect for the PVK-based perovskite film with moisture degradation for 6 days under an RH of 50%, and the corresponding PVK-based PSC exhibits a higher efficiency of 21.64% PCE and a smaller hysteresis index (HI). Moreover, even after 3550 hours of storage in an argon glovebox, the PVK-based PSC retains 98% of its initial efficiency.

关键词： perovskite solar cells ambient air fabrication poly(N-vinylcarbazole) surface passivation hydrophobic property

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A ‘Critical’ Insight into Pretransitional Behavior and Dielectric Tunability of Relaxor Ceramics

arXiv

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arXiv 2023年

作者： Rzoska, Sylwester J. Drozd-Rzoska, Aleksandra Bulejak, Weronika Loś, Joanna Starzonek, Szymon Szafran, Mikolaj Gao, Feng Institute of High Pressure Physics Polish Academy of Sciences ul. Sokolowska 29/37 Warsaw01-142 Poland Faculty of Chemistry Warsaw University of Technology Noakowskiego 3 Warsaw00-664 Poland Laboratory of Physics Faculty of Electrical Engineering University of Ljubljana Ljubljana Slovenia State Key Lab. of Solidification Processing School of Materials Science and Engineering Northwestern Polytechnical University Shaanxi Xi’an710072 China

The model discussion focused on links between the unique properties of relaxor ceramics and the basics of Critical Phenomena Physics and Glass Transition Physics is presented. It indicates the significance of uniaxiality for appearing mean-field type features near paraelectric – ferroelectric transition. Pretransitional fluctuations, increasing up to grain size and leading to inter-grain, random, local electric fields, are indicated to be responsible for relaxor ceramics characeristics. Their impacts yield the pseudospinodal behavior associated with ‘weakly discontinuous’ local phase transitions. The emerging model re-defines the meaning of the Burns temperature and polar nanoregions (PNRs). It offers a coherent explanation of ‘dielectric constant’ changes with the ‘diffused maximum’ near paraelectric – ferroelectric transition, the sensitivity even to moderate electric fields (tunability), and the ‘glassy’ dynamics. These considerations are confronted with experimental results for the complex dielectric permittivity studies in Ba0.65Sr0.35TiO3 relaxor ceramic, covering ca. 200K range, from the paraelectric to the ‘deep’ ferroelectric phase. The distortions-sensitive and derivative-based analysis revealed the preference for the exponential scaling pattern for ℇ(T) changes in the paraelectric phase and in the surrounding of the paraelectric-ferroelectric transition. It may suggest the Griffith-phase type behavior, associated with the mean-field criticality disturbed by random local impacts. The discussion of experimental results is supplemented by relaxation times changes and the coupled energy losses analysis. The studies also led to the description of tunability temperature changes with scaling relations. © 2023, CC BY.

关键词： Glass transition

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Laser cladding and characterization of FeCoCrNi-based HEA coatings with BCC/L21 coherent strengthening

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materials Characterization 2025年 225卷

作者： Cao, Siqi Xiao, Huaqiang Qin, Xiaohui Mo, Taiqian Zhang, Zhengwen Fu, Guang School of Mechanical Engineering Guizhou University Guiyang550025 China Department of Mechanical Engineering National University of Singapore 117575 Singapore Guangdong Key Laboratory for Advanced Metallic Materials Processing South China University of Technology Guangzhou510640 China

Deposition of high-entropy alloy (HEA) coatings onto 316 stainless steel (316SS) substrates demonstrates significant potential for surface performance enhancement. In this work, (FeCoCrNi)100-x(TiAl)x, (x = 0, 5, 7.5, 10, 15, at. %) HEA coatings (abbreviated as TA0, TA5, TA7.5, TA10 and TA15) were prepared on 316SS substrate by laser cladding. Results show that sample TA0 (without addition of TiAl) exhibits a long straight columnar structure with single-phase FCC structure. After adding TiAl powder, the dendrites turn into FCC + BCC dual-phase alternating eutectic structure. With increase in TiAl powder content, the content of eutectic structure grows first and then decreases. Simultaneously, the FCC phase gradually decreases with the coarsening of BCC phase, and finally changes into the equiaxial structure of TA15. Significant coherent precipitation of [011¯] BCC//[011¯]L21 (Heusler phase) occurs in samples TA7.5, TA10, and TA15, with the number of nanophase (L21-Ni2TiAl) increasing as the BCC size increases, resulting in a higher density of misfit dislocations within the BCC matrix. Moreover, micron-scale Ti-rich granular precipitates (FCC) are diffusely distributed throughout matrix phase due to the high energy input of the laser. Synergistic strengthening mechanisms combining phase transformation hardening, precipitation strengthening, and dislocation interactions collectively enhance the Vickers hardness across the systems. The highest hardness of 514 HV is obtained for sample TA15, which is 66.9 % higher than that of the substrate. The above work can provide guidance for the direct microstructure adjustment of FeCoCrNi-based high entropy alloy coating and the improvement of surface hardness of 316SS by laser cladding. © 2025 Elsevier Inc.

关键词： Cladding (coating)

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Design of Atomic Cobalt Selenide-Doped Sulfurized Polyacrylonitrile Cathode with Enhanced Electrochemical Kinetics for High Performance Lithium-Span Batteries

SSRN

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SSRN 2023年

作者： Xu, Zhi-Qiang Zou, Rong Liu, Wen-Wu Liu, Guang-Long Cui, Yun-Shou Lei, Yi-Xiao Zheng, Ya-Wen Niu, Wen-Jun Wu, You-Zhi Gu, Bing-Ni Liu, Ming-Jin Ran, Fen Chueh, Yu-Lun State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of Technology Lanzhou730050 China College of Materials Science and Engineering Lanzhou University of Technology Lanzhou730050 China Nickel-Cobalt New Materials Technology Innovation Center Co. LTD of Gansu Jinchuan Jinchang737100 China Jinchang Lanbo Environmental Protection Equipment Co. LTD Jinchang737100 China Department of Materials Science and Engineering National Tsing Hua University Hsinchu30013 Taiwan Colleage of Semiconductor Research National Tsing-Hua University Hsinchu30013 Taiwan Frontier Research Center on Fundamental and Applied Sciences of Matters National Tsing Hua University Hsinchu30013 Taiwan Department of Physics National Sun Yat-Sen University Kaohsiung80424 Taiwan

In this work, sulfurized polyacrylonitrile (SPAN) cathodes with atomically dispersed Co and Se active site, namely cobalt selenide doped-sulfide polyacrylonitrile (CoSe2-x@SPAN, x = 6, 10, 15) with different CoSe2 doping concentrations of 6, 10, and 15 wt %, were fabricated by co-heating approach to strengthen the charge conductivity and catalytic activity of SPAN cathode. Atomic scale CoSe2 were doped into the SPAN skeleton to expediating the redox kinetics of lithium storage process, and the catalytic mechanism was made clear by a viewing angle of frontier molecular orbital theory. The DFT calculation results show that CoSe2@SPAN has a more uniform electrostatic potential distribution with a smaller LUMO-HOMO band gap, which is more conducive to electron transport. Meanwhile, the larger Gibbs free energy variation during the lithiation process indicates the enhanced reaction kinetics of the CoSe2@SPAN cathode. Ultimately, The Li-SPAN battery with CoSe2-10@SPAN cathode delivers high reversible capacity of 1475 mAh g‒1 at 0.2 A g–1, superior rate capability and long-term capacity retention of 71.1 % after 500 cycles at 1.0 A g–1. Accordingly, this study offers insights into the utilization of frontier molecular orbital theory (FMO) to improve the redox kinetics and sulfur utilization of Li-SPAN batteries. © 2023, The Authors. All rights reserved.

关键词： Gibbs free energy

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Design on Modified-Zinc Anode with Dendrite- and Side Reactions-Free by Hydrophobic Organic-Inorganic Hybrids for Ultra-Stable Zinc Ion Batteries

SSRN

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SSRN 2022年

作者： Liu, Mao-Cheng Tian, Chen-Yang Zhang, Dong-Ting Zhang, Yu-Shan Zhang, Bin-Mei Wang, Yuan-Yi Li, Chen-Yang Liu, Ming-Jin Gu, Bing-Ni Zhao, Kun Kong, Ling-Bin Chueh, Yu-Lun State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of Technology Lanzhou730050 China School of Materials Science and Engineering Lanzhou University of Technology Lanzhou730050 China Department of Materials Science and Engineering National Tsing Hua University Hsinchu30013 Taiwan Frontier Research Center on Fundamental and Applied Sciences of Matters National Tsing Hua University Hsinchu30013 Taiwan Department of Physics National Sun Yat-Sen University Kaohsiung80424 Taiwan

Zinc has been widely deployed as an anode of zinc ion batteries (ZIBs) due to high safety, high theoretical capacity, and low potential. However, dendrite growth and side reactions still severely hampered scale-up implementation in ZIBs. Here, organic hydrophobic polyvinylidene fluoride and inorganic Santa Barbara Amorphous-15 (PVDF-SBA15) hybrids were designed as a surface modification layer to stabilize Zn anode, leading to an optimized Zn/electrolyte interface with large-scale feasibility. The PVDF-SBA15 surface modification realizes synergistic protection on zinc anode since the hydrophobic PVDF could avoid the side reactions through prevention of direct contact between the zinc and the electrolyte, while the evenly distributed porous structure of SBA15 can induce uniform zinc plating/stripping and inhibit dendrite growth by uniform zinc ions flux. The hydrophobic PVDF-SBA15 surface-modified Zn anode (PVDF-SBA15@Zn) exhibits dendrite-free Zn plating/stripping with low overpotential after 1650 hours at a current density of 3 mA cm-2 in symmetrical batteries. The PVDF-SBA15@Zn||V2O5 full batteries enable the stable cycling of 82.14 % capacity retention after 1000 cycles compared with 23.55 % of Zn||V2O5. The effectively inhibited dendrite growth and side reactions on Zn anode through hydrophobic organic-inorganic surface modification layer provide solid foundation for the realization of ultra-stable zinc ion batteries. © 2022, The Authors. All rights reserved.

关键词： Anodes

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