An investigation of gaseous hydrogen storage characterizations of Mg-Y-Ni-Cu alloys synthesized by melt spinning

Yanghuan Zhang; Yanquan Ji; Zeming Yuan; Wengang Bu; Yan Qi; Shihai Guo

doi:10.1039/c8ra05429k

An investigation of gaseous hydrogen storage characterizations of Mg-Y-Ni-Cu alloys synthesized by melt spinning

RSC Adv. 2018 Aug 14;8(51):28969-28977. doi: 10.1039/c8ra05429k.

Authors

Yanghuan Zhang^{1

2}, Yanquan Ji^{1

2}, Zeming Yuan^{1

2}, Wengang Bu^{1

2}, Yan Qi², Shihai Guo²

Affiliations

¹ Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology Baotou 014010 China.
² Department of Functional Material Research, Central Iron and Steel Research Institute Beijing 100081 China zhangyh59@sina.com.

Abstract

Melt spinning was successfully utilized to prepare Mg_25-x Y _x Ni₉Cu (x = 0, 1, 3, 5, 7) alloys, producing nanocrystalline and amorphous structures with improved hydrogenation and dehydrogenation performances. The influence of spinning rate on hydrogenation and dehydrogenation thermodynamics and kinetics was studied in detail. XRD and TEM were utilized to characterize the alloy structures. Hydrogenation and dehydrogenation performances were investigated by Sievert apparatus, DSC and TGA connected to a H₂ detector. Dehydrogenation activation energies were estimated using both Arrhenius and Kissinger methods. Results show that melt spinning significantly decreases thermodynamic parameters (ΔH and ΔS) and ameliorates desorption kinetics. Dehydrogenation activation energy markedly lowers with increase in spinning rate and is the real driver of amelioration of dehydrogenation kinetics caused by increasing Y content.