Enhancing hydrogen storage properties of MgH_(2) using FeCoNiCrMn high entropy alloy catalysts

作     者：Haiyi Wan Xiu Yang Shiming Zhou Lei Ran Yangfan Lu Yu’an Chen Jingfeng Wang Fusheng Pan Haiyi Wan;Xiu Yang;Shiming Zhou;Lei Ran;Yangfan Lu;Yu'an Chen;Jingfeng Wang;Fusheng Pan

作者机构：College of Materials Science and EngineeringChongqing UniversityChongqing 400044China National Engineering Research Center for Magnesium AlloysChongqing UniversityChongqing 400044China Guangdong Guoyan Science and Technology Research Center Co.LtdGuangdong 518000China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2023年第149卷第18期

页      面：88-98页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 0817[工学-化学工程与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 

基　　金：financially supported by the Chongqing Spe-cial Key Project of Technology Innovation and Application Devel-opment China(Grant No.cstc2019jscx-dxwtBX0016). 

主　　题：Hydrogen storage Magnesium hydride High entropy alloy Catalytic effects 

摘      要：Herein,we report the successful preparation of the FeCoNiCrMn high entropy alloy(HEA)loaded MgH_(2) and HEA’s effect on the hydrogen storage properties of Mg/MgH_(2).The HEA shows high catalytic activity toward hydrogen dissociation and recombination reaction,and successfully suppressed activation energy of dehydrogenation reaction from 151.9 to 90.2 kJ mol-1.Moreover,part of Co and Ni can react with Mg,and produce Mg_(2) Co/Mg_(2) CoH 5 and Mg_(2) Ni/Mg_(2) NiH_(4) during the hydrogen storage processes,further en-hancing dehydrogenation reaction through the“hydrogen pumpingmechanism.Asa result,the MgH_(2)-5 wt%HEA composite can release 5.6 wt%of H_(2) at 280℃ within 10 min,and absorb 5.5 wt%H_(2) within 0.5 min at 150℃.The loaded HEA shows robustness against particle aggregation,leading to stable re-versible hydrogen storage processes at least 50 times.These findings show the synergistic effects of HEA on Mg-based hydrogen storage materials,providing an additional degree of freedom for catalyst design.