Electrochemical hydrogen storage in (Ti{sub}(1-x)V{sub}x){sub}2Ni (x = 0.05-0.3) alloys comprising icosahedral quasicrystalline phase

摘要

For (Ti{sub}(1-x)V{sub}x){sub}2Ni (x = 0.05, 0.1, 0.15, 0.2 and 0.3) ribbons, synthesized by arc-melting and subsequent melt-spinning techniques, an icosahedral quasicrystalline phase was present, either in the amorphous matrix or together with the stable Ti{sub}2Ni-type phase. With increasingx values, the maximum discharge capacity of the alloy electrodes increased until reached 271.3 mAh/g when x = 0.3. The cycling capacity retention rates for these electrodes were approximately 80% after a preliminary test of 30 consecutive cycles of charging and discharging. Ti{sub}1.7V{sub}0.3Ni alloy electrode displayed the best high-rate discharge ability of 82.7% at the discharge current density of 240 mA/g.