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Electrochemical Hydrogen Storage in Ti 1.6 V 0.4 Ni 1− x Co x Icosahedral Quasicrystalline Alloys
Author(s) -
Hu Wen,
Niu Xiao D.,
Watada Masaharu,
Kawabe Yoshiteru,
Wu Yao M.,
Wang Li D.,
Wang Li M.
Publication year - 2010
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.200900664
Subject(s) - hydrogen storage , icosahedral symmetry , alloy , electrochemistry , materials science , quasicrystal , phase (matter) , metastability , hydrogen , electrode , crystallography , analytical chemistry (journal) , desorption , metallurgy , chemistry , adsorption , organic chemistry , chromatography
The discovery of the icosahedral phase (i‐phase) in rapidly quenched Ti 1.6 V 0.4 Ni 1−x Co x ( x =0.02–0.1) alloys is described herein. The i‐phase occurs in a similar amount relative to the coexisting β‐Ti phase. The electron diffraction patterns show the distinct spot anisotropy, indicating that the i‐phase is metastable. The electrochemical hydrogen storage performances of these five alloy electrodes are also reported herein. The hydrogen desorption of nonelectrochemical recombination in the cyclic voltammetric (CV) response exhibits the demand for electrocatalytic activity improvement. A discharge capacity of 261.5 mA h g −1 was measured in a Ti 1.6 V 0.4 Ni 0.96 Co 0.04 alloy electrode at 30 mA g −1 and 303 K and it is shown that an appropriate amount of Co element addition would enhance the cycling stability at the expense of high‐rate discharging ability.