Abstract
Effect of nickel substitution on the electrochemical hydriding and dehydriding behavior of TiMn 2 type hydrogen storage alloys in 6 M aqueous KOH solution was investigated. The electrode characteristics of TiMn 2− x Ni x ( x=0.0–0.5), such as discharge capacity, high rate dischargeability and cycle life, indicate that addition of nickel in the alloy increases the discharge capacity and cycle life characteristics of the alloy. The electrochemical kinetics was evaluated using dc polarization and ac impedance analysis techniques, and it was found that both diffusion and charge transfer of hydrogen play a role in electrolytic absorption of hydrogen. The hydrogen diffusivity in the alloys was estimated by an electrochemical method for fully charged alloy electrodes and was found to increase with increase in nickel content in the alloy.
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