Electrochemical hydrogen storage in Ti(1.6)V(0.4)Ni(1-x)Co(x) icosahedral quasicrystalline alloys.
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 beta-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.
Hu
Wen
W
State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022, PR China.
Niu
Xiao D
XD
Watada
Masaharu
M
Kawabe
Yoshiteru
Y
Wu
Yao M
YM
Wang
Li D
LD
Wang
Li M
LM