ChemInform Abstract: Heat-Treatment Effects of V-Based Solid Solution Alloy with TiNi-Based Network Structure on Hydrogen Storage and Electrode Properties.
Abstract
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ChemInform Abstract
The effects of thermal treatments in the temp. range 973 → 1473 K are studied for the title alloy consisting of a V-based solid solution main phase acting as main hydrogen storage site and of a TiNi- based secondary phase acting as microcurrent collector and electrocatalyst for electrochemical reactions. Heat treatment at 1073 K increases the volume fraction of the main phase which improves the hydrogen storage capacity and reduces the corrosive V content in the secondary phase. This leads to an improvement of the durability during charge-discharge cycles. Treatment at ≥ 1173 K increases the grain size of the main phase and damages the network structure of the secondary phase which results in decreasing high rate capabilities and cycle lives.
