Abstract
We have developed the new compositional V-7.4at%Ti-7.4at%Zr-7.4at%Ni alloys that consist of BCC as main phase, and C14 Laves phases along grain boundary. They have the flat plateau region in the PCT curves and 2.0mass% protium absorption-desorption capacity. This paper investigates electrochemical characteristics of V-7.4at%Ti-7.4at%Zr-7.4at%Ni protium absorbing alloys as metal hydride electrodes. The electrodes which were prepared by mixing as-cast alloys with 300mass% Ni powder show 372mAh/g discharge capacity at 10mA/g discharge current. This result indicates that V-7.4at%Ti-7.4at%Zr-7.4at%Ni alloys work as metal hydride electrodes. It was found that the electrodes which were prepared by mixing as-cast alloys with Ni powder and heat-treated for 1h at 873K can discharge by the protium that can't desorb in a gas reaction.
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