Electrochemical and Structural Characterization of Ti-V-Ni Hydrogen Storage Alloys with BCC Structure

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Abstract
Various Ti‐V‐Ni hydrogen storage alloys branched from , one of Ni‐substituted alloys, were prepared by an arc‐melting method. All alloys prepared in this work were composed of both black and white phases to a greater or lesser extent. It was found by X‐ray diffractometry and electron probe microanalysis that the black and white phases were assignable to V‐based solid solution and TiNi‐based and traces of alloys, respectively. Their pressure composition isotherms suggested that alloy had potentiality of high discharge capacity . The maximum discharge capacity of the alloy observed in charge‐discharge cycle tests was at the discharge current density of , which was the highest value among the Ti‐V‐Ni alloys with body‐centered cubic structure reported until now. This seems to be because the black and white phases in the alloy form the most appropriate network which facilitates the hydrogen absorption and desorption. © 2000 The Electrochemical Society. All rights reserved.

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