The ability to reversibly absorb and desorb a large amount of hydrogen at ambientconditions makes vanadium very attractive for energy storage application in fuel cell vehicles.Because of its high cost, alloying with other inexpensive elements is favorable. However, it is wellknown that alloying V with other elements often leads to unfavorable changes in hydrogen storageproperties such as cyclic stability. It has been reported that by adding a small amount of Fe or Nb,reduction in the reversible hydrogen storage capacity can be effectively restrained [1,2]. Byinvestigating the average and local structures we have tried to understand the effect of Fe or Nb onthe improvement of the cyclic stability of V-based bcc alloys.
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