Hydrogen storage composite alloy Ti0.10Zr0.15V0.35Cr0.10Ni0.30–10% LaNi3 was prepared by two-step arc-melting to improve the electro-catalytic activity and the kinetic performance of Ti-V-based solid solution alloy. ...Hydrogen storage composite alloy Ti0.10Zr0.15V0.35Cr0.10Ni0.30–10% LaNi3 was prepared by two-step arc-melting to improve the electro-catalytic activity and the kinetic performance of Ti-V-based solid solution alloy. The electrochemical properties and synergetic effect of the composite alloy electrode were systematically investigated by using X-ray diffractometry, field emission scanning electron microscopy, energy-dispersive spectrometry, electrochemical impedance spectroscopy and galvanostatic charge/discharge test. It is found that the main phase of the composite alloy is composed of V-based solid solution phase with a BCC structure and C14 Laves phase with hexagonal structure, while the secondary phase is formed in the composite alloy. The comprehensive electrochemical properties of the composite alloy electrode are significantly improved. The activation cycle number, the maximum discharge capacity and the low temperature dischargeability of the composite alloy are 5 cycles, 362.5 mA-h/g and 65.84% at 233 K, respectively. It is suggested that distinct synergetic effect occurs in the activation process, composite process, cyclic process and discharge process at a low or high temperature under different current densities, in the charge–transfer resistance and exchange current density.展开更多
In order to improve performance of Ti-V-based solid solution alloy, electrochemical characteristics and synergetic effect of Ti0.10Zr0.15V0.35Cr0.10Ni0.30-10 wt.%LaNi5 hydrogen storage composite electrode prepared by ...In order to improve performance of Ti-V-based solid solution alloy, electrochemical characteristics and synergetic effect of Ti0.10Zr0.15V0.35Cr0.10Ni0.30-10 wt.%LaNi5 hydrogen storage composite electrode prepared by two-step arc-melting were investigated system-atically. X-ray diffractometry （XRD） and scanning electron microscopy-energy dispersive spectroscopy （SEM-EDS） showed that the main phase of composite alloy was composed of V-based solid solution phase with a BCC structure and C14 Laves phase with hexagonal structure, while secondary phase also existed in the composite alloy. The results showed that electrochemical characteristics of the composite alloy elec-trode were significantly improved. It was suggested that synergetic effect appeared in the maximum discharge capacity of the composite alloy, synergetic effect of the discharge capacity appeared in the activation process, in the composite process, in the cyclic process, in the discharge process at low/high temperature and at different current densities, and synergetic effect existed in the charge-transfer resistance and in the ex-change current density, which seemed to be related to formation of the secondary phase.展开更多
基金Project (B2011203074) supported by the Natural Science Foundation of Hebei Province, ChinaProject (201101A129) supported by the Technology Research and Development Program of Qinhuangdao, Hebei Province, China
文摘Hydrogen storage composite alloy Ti0.10Zr0.15V0.35Cr0.10Ni0.30–10% LaNi3 was prepared by two-step arc-melting to improve the electro-catalytic activity and the kinetic performance of Ti-V-based solid solution alloy. The electrochemical properties and synergetic effect of the composite alloy electrode were systematically investigated by using X-ray diffractometry, field emission scanning electron microscopy, energy-dispersive spectrometry, electrochemical impedance spectroscopy and galvanostatic charge/discharge test. It is found that the main phase of the composite alloy is composed of V-based solid solution phase with a BCC structure and C14 Laves phase with hexagonal structure, while the secondary phase is formed in the composite alloy. The comprehensive electrochemical properties of the composite alloy electrode are significantly improved. The activation cycle number, the maximum discharge capacity and the low temperature dischargeability of the composite alloy are 5 cycles, 362.5 mA-h/g and 65.84% at 233 K, respectively. It is suggested that distinct synergetic effect occurs in the activation process, composite process, cyclic process and discharge process at a low or high temperature under different current densities, in the charge–transfer resistance and exchange current density.
基金Project supported by the Natural Science Foundation of Hebei Province (B2011203074)
文摘In order to improve performance of Ti-V-based solid solution alloy, electrochemical characteristics and synergetic effect of Ti0.10Zr0.15V0.35Cr0.10Ni0.30-10 wt.%LaNi5 hydrogen storage composite electrode prepared by two-step arc-melting were investigated system-atically. X-ray diffractometry （XRD） and scanning electron microscopy-energy dispersive spectroscopy （SEM-EDS） showed that the main phase of composite alloy was composed of V-based solid solution phase with a BCC structure and C14 Laves phase with hexagonal structure, while secondary phase also existed in the composite alloy. The results showed that electrochemical characteristics of the composite alloy elec-trode were significantly improved. It was suggested that synergetic effect appeared in the maximum discharge capacity of the composite alloy, synergetic effect of the discharge capacity appeared in the activation process, in the composite process, in the cyclic process, in the discharge process at low/high temperature and at different current densities, and synergetic effect existed in the charge-transfer resistance and in the ex-change current density, which seemed to be related to formation of the secondary phase.
