Crystal structure and some dynamic performances of Ti0.25V0.34Dy0.01Cr0.1Ni 0.3 hydrogen storage electrode

Crystal structure and some dynamic performances of Ti0.25V0.34Dy0.01Cr0.1Ni0.3 hydrogen storage electrode alloy have been investigated by XRD, FESEM-EDS, TEM and EIS measurements. The result shows that the alloy is mainly composed of V-based solid solution phase with body-centered-cubic structure and mono-crystal Ni3Ti phase with hexagonal structure (Space grope: P63/mmc), and it was first observed as TiNi-based secondary phase. The higher charge transfer resistance, higher apparent activation energy and lower hydrogen diffusion coefficient are reasons for the poor electrochemical activity of the dehydriding kinetics of TiV-Cr-Ni hydride alloy. (C) 2010 Yu Qing Qiao. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.