Effect of Graphene on Hydrogen Storage Properties of TiZrCr Alloy
In view of the issues of low hydrogen storage capacity,hydrogen absorption/desorption hysteresis and slow hydrogen absorption/desorption rate of Ti-based hydrogen storage alloys under normal temperature and pressure,TiZrCr alloy ingots were prepared by arc melting,then the nanocrystalline/amorphous ribbon was obtained by rapidly cooling of the melt.Finally,the ribbon and the graphene were ground by high-energy ball milling to produce composite powders.The microscopic structure and hydrogen storage characteristics of the powders were analyzed.The results show that the phases of the alloy are composed of TiCr2,ZrCr2 Laves phases and Ti phase before hydrogen storage,and the phase after hydrogen storage is TiH1.971,TiH1.924,Ti2ZrH4 and CrH2.After adding graphene,the hydrogen storage capacity of the powder increases from 1.2wt%to 1.3wt%,the hydrogen absorption and desorption rate increases from 0.082wt%·min-1 to 0.381wt%·min-1,and the hydrogen desorption activation energy decreases from 139 kJ/mol to 118 kJ/mol.Graphene mixed in the alloy powder increases the hydrogen diffusion channel and improves the hydrogen storage performance.
TiZrCr alloysolid-state hydrogen storagegraphenemicrostructure and properties
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