Catalytic effect of carbon-supported NiCoFeCuMg high-entropy alloy nanocatalysts on hydrogen storage properties of MgH_(2)  

作　　者：Yafei Liu Mengyuan Yue Yusang Guo Yaru Jiang Yu Sun Lizhuang Feng Yijing Wang 

机构地区：[1]Key Laboratory of Advanced Energy Materials Chemistry,Ministry of Education,Renewable Energy Conversion and Storage Center,Collaborative Innovation Center of Chemical Science and Engineering(Tianjin),College of Chemistry,Nankai University,Tianjin,300071,PR China

出　　处：《Journal of Magnesium and Alloys》2025年第3期1232-1242,共11页镁合金学报(英文)

基　　金：supported by National Key Research and Development Program of China(2021YFB4000604);National Natural Science Foundation of China(52271220);111 Project(B12015);the Fundamental Research Funds for the Central Universities.

摘　　要：High entropy alloy(HEA)based materials have been extensively investigated as viable catalysts in hydrogen storage for their unique properties.Herein,we demonstrate a relatively mild synthesis strategy for constructing carbon-supported by NiCoFeCuMg HEA(NiCoFe-CuMg@C)nanocatalysts by utilizing polymetallic metal-organic frameworks(MOFs)as precursors.The incorporation of prepared catalysts into MgH_(2) greatly improved the hydrogen storage performance:the MgH_(2)+NiCoFeCuMg@C composite can rapidly desorb 6.01 wt%H2 at 325℃,and the initial dehydrogenation temperature decreased to 167.2℃,nearly 163.8℃ lower than that of the pure MgH_(2).Besides,the composite exhibits a fairly stable reversible capacity with 97%capacity retention after 20 cycles.Most importantly,ex-situ structural characterization reveals that the synergistic effects of the“hydrogen pump”role of Mg_(2)Ni(Cu)/Mg_(2)Ni(Cu)H_(4) and“hydrogen gateway”role of Co3Fe7,as well as the excellent dispersion function of carbon material,contribute to the outstanding hydrogen storage properties of the MgH_(2)+NiCoFeCuMg@C composite.This study provides valuable insights into the performance improvement of carbon-supported HEA catalysts in modification of MgH_(2).

关 键 词：Hydrogen storage Magnesium hydride High entropy alloy Synergistic effect 

分 类 号：O643.36[理学—物理化学]