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Preparation of Hydrogen Storage Ti-VCr Alloy from the Oxide Mixture in CaCl 2

The mixture of TiO2, V2O3 and Cr2O3 powders were reduced simultaneously inside the basket-type of cathode in the molten CaCl2, where the by-product CaO was returned to the reductant Ca by the electrolysis. A fine metallic particles consisting of the BCC solid solution and a small amount of TiCr2 phase were successfully obtained after 10.8 ks at 1173 K. The oxygen concentration was in the level of 2000 mass ppm. The carbon contamination due to CO2 gas evolution at the anode during the electrolysis could be avoided by the electrode arrangement in the melt. The compositional homogeneity in the sample was improved by the rapid cooling, because the BCC solid solution decomposes during the slow cooling from 1173 K. This sample could absorb about 1.9 mass % hydrogen at maximum, and the effective (reversible) hydrogen storage was 1.68 mass %, which approached to 87.5% of the previous reports.