The high-temperature proton-conducting oxide, BaZr0.65Ce0.2Y0.1Ru0.05O3-δ, was applied as the anode of a hydrogen battery. The electrochemical charge/discharge properties were investigated, by a conventional three-electrode cell with a KOH solution, as a function C-rate, cycle number, and nickel contents. The relatively low-charging current for an oxide electrode, compared with a metal electrode, was discovered due to the low electronic conducting properties of the oxide electrode. The degradation of charge capacities of the oxide electrode was also observed due to the evolution of hydrogen gas during charging, which may have blocked the contact area between the electrode and electrolyte, leading to a decrease in active electrode reaction areas. Furthermore, the oxide electrode displayed systematic degradation in discharge capacities as the number of cycles was increased.

Keywords: Perovskite-type oxide, Hydrogen storage, Negative electrode.