Positron Lifetime Study on Degradation of TiCrV Hydrogen Storage Alloy
(0) To realize the hydrogen fuel cell vehicles in future, the rechargeable hydrogen capacity of storage material should be improved to more than 4 mass％. The Ti-Cr-V solid solution alloy is a promising hydrogen storage material for fuel cells since this alloy exhibits a relatively higher initial storage capacity (3.9 mass％) as compared to the other alloys. After one hydriding cycle, the effective hydrogen capacity is approximately 2.6 mass％. Subsequently, this is gradually reduced with the further hydriding cycles. The strain accumulation and pulverization during hydriding cycles are thought to be the reasons in addition to the surface contamination and the formation of stable hydrides. Microscopically, excess vacancy defects and dislocations may be generated during hydriding cycles. These internal defects trap hydrogen to reduce the rechargeable hydrogen capacity. It is important to reveal the physical origins of harmuful defects acting as hydrogen trapping centers during hydriding cycles.
A.Kawasuso H.Arashima M.Maekawa T.Kabutomori
ASCRC,Japan Atomic Energy Agency,1233,Takasaki,Gunma,370-1292,Japan MRL,The Japan Steel Works,Ltd.4,Chatsumachi,Muroran,051-8505,Japan
国际会议
第九届国际正电子与正电子素国际会议(9th International Workshop on Positron and Positronium Chemistry)(PPC–9)
武汉
英文
88
2008-05-11（万方平台首次上网日期，不代表论文的发表时间）