Stable Ti/RuO₂-Sb₂O₅-SnO₂electrodes for O₂evolution

RuO2-based electrodes are generally known to be unstable for O2evolution. In this paper, a stable type of RuO2-based electrode, Ti/RuO2-Sb2O5-SnO2, is demonstrated for O2evolution. In the ternary oxide coating, RuO2serves as the catalyst, SnO2as the dispersing agent, and Sb2O5as the dopant. The accelerated life test showed that the Ti/RuO2-Sb2O5-SnO2electrode containing 12.2 molar percent of RuO2nominally in the coating had a service life of 307 h in 3 M H2SO4solution under a current density of 0.5 A cm-2at 25 °C, which is more than 15 times longer than other types of RuO2-based electrodes. Instrumental analysis indicated that RuO2-Sb2O5-SnO2was a solid solution with a compact structure, which contributed to the stable nature of the electrode.