Electrochemical hydrogen storage in (Ti1−xVx)2Ni (x = 0.05-0.3) alloys comprising icosahedral quasicrystalline phase |
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Authors: | Wen Hu Jianli Wang Lidong Wang Limin Wang |
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Affiliation: | a State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, CAS, 5625 Renmin Street, Changchun 130022, China b Graduate University of Chinese Academy of Science, Beijing 100049, China |
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Abstract: | For (Ti1−xVx)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 Ti2Ni-type phase. With increasing x 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. Ti1.7V0.3Ni alloy electrode displayed the best high-rate discharge ability of 82.7% at the discharge current density of 240 mA/g. |
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Keywords: | Ti-V-Ni alloy Icosahedral quasicrystalline phase Electrochemical characteristics Metal hydride electrode Hydrogen storage properties |
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