FeCoNiCrMo high entropy alloy nanosheets catalyzed magnesium hydride for solid-state hydrogen storage  

作　　者：Tao Zhong Haoyu Zhang Mengchen Song Yiqun Jiang Danhong Shang Fuying Wu Liuting Zhang 

机构地区：[1]School of Energy and Power,Instrumental Analysis Center,Jiangsu University of Science and Technology,Zhenjiang 212003,China [2]Max Planck Institute for Iron Research,Düsseldorf,40237,Germany [3]School of Environmental and Chemical Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2023年第11期2270-2279,共10页矿物冶金与材料学报（英文版）

基　　金：National Natural Science Foundation of China(No.51801078)。

摘　　要：The catalytic effect of FeCoNiCrMo high entropy alloy nanosheets on the hydrogen storage performance of magnesium hydride(MgH_(2))was investigated for the first time in this paper.Experimental results demonstrated that 9wt%FeCoNiCrMo doped MgH_(2)started to dehydrogenate at 200℃and discharged up to 5.89wt%hydrogen within 60 min at 325℃.The fully dehydrogenated composite could absorb3.23wt%hydrogen in 50 min at a temperature as low as 100℃.The calculated de/hydrogenation activation energy values decreased by44.21%/55.22%compared with MgH_(2),respectively.Moreover,the composite’s hydrogen capacity dropped only 0.28wt%after 20 cycles,demonstrating remarkable cycling stability.The microstructure analysis verified that the five elements,Fe,Co,Ni,Cr,and Mo,remained stable in the form of high entropy alloy during the cycling process,and synergistically serving as a catalytic union to boost the de/hydrogenation reactions of MgH_(2).Besides,the FeCoNiCrMo nanosheets had close contact with MgH_(2),providing numerous non-homogeneous activation sites and diffusion channels for the rapid transfer of hydrogen,thus obtaining a superior catalytic effect.

关 键 词：hydrogen storage magnesium hydride high entropy alloy nano-sheets CATALYSIS 

分 类 号：TQ132.2[化学工程—无机化工] TQ032.4[一般工业技术—材料科学与工程] TB383.1