Effect of VFe addition on hydrogen storage behavior of TiMn_1.5-based alloys

Xuebin Yu;Zhu Wu;Baojia Xia;Taizhong Huang;Jinzhou Chen;Naixin Xu Lab of Energy Science and Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China

摘 要：<正> The hydrogen absorption and desorption behavior of TiMn_1.25Cr_0.25 alloys with VFe substitution for partial Mn was inves-tigated at 273, 293 and 313 K. It is found that VFe substitution increases their hydrogen storage capacity, decreases the plateau pres-sure and the hysteresis factor of their pressure - composition - temperature （PCT） curves. After annealing treatment at 1223 K for 6 h,TiMn_0.95Cr_0.25（VFe）_0.3 alloy exhibits a lower hydrogen desorption plateau pressure （0.27 MPa at 313 K） and a smaller hysteresis factor（0.13 at 313 K）; the maximum and effective hydrogen storage capacities （mass fraction） are 2.03% and 1.12% respectively, whichcan satisfy the demand of hydrogen storage tanks for proton exchange membrane fuel cells （PEMFC）.

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