Journal
JOURNAL OF SOLID STATE CHEMISTRY
Volume 202, Issue -, Pages 1-5Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2013.03.006
Keywords
Corrosion resistance; Electrochemical hydrogen storage; Icosahedral quasicrystal; Ti-V-Ni-Sc alloy; Self-discharge
Funding
- National Nature Science Foundations of China [51202242, 21073179]
- Foundation for Innovative Research Groups of the National Natural Science Foundation of China [20921002]
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Thanks to the revolutionary discovery of 5-fold symmetry contributed by Shechtman, quasicrystal is now recognized as another solid-state existing form. As the second largest class of quasicrystals, titanium-based icosahedral quasicrystals are very promising for hydrogen storage applications owing to their inherent abundant interstitial sites and favorable hydrogen-metal chemistry. In this context, (Ti1.6V0.4Ni)(100-x)Sc-x (x=0.5-6) quaternary icosahedral quasicrystals have been successfully synthesized via arc-melting and subsequent melt-spinning techniques, and then their electrochemical performance toward hydrogen is explored. When the molar ratio of Sc addition is under 1%, a maximum discharge capacity of about 270 mA h g(-1) can be delivered. With further increasing Sc amount to 6%, good cycling stability as well as significantly retarded self-discharge rate (capacity retention 94% after 24 h relaxation) is observed. But meanwhile, the discharge capacities fall into 250-240 mA h g(-1), and the electrocatalytic activity improvement is highly demanded. (C) 2013 Elsevier Inc. All rights reserved.
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