The oxygen evolution reaction on the alloys of Ni with Ir, Ru, or W and on Ni-Ti intermetall ic ompounds was studied in 30 weight percent (w/o) KOH at 80 ~ using steady-state potentiostatic and slow potentiodynamic (at 0.1 mV/sec) methods. Since this reaction always takes place on film-covered surfaces, the nature of oxide films formed on these alloys was investigated using cyclic voltammetry. The peaks for the formation and reduction of oxygen-containing layers appearing on the pure metals are not always found on these alloys. Oxygen overpotentials at an apparent current density of 20 mA/cm 2, on the alloys of 50Ni-501r and 75Ni-25Ru (in atomic percent, a/o) and the intermetall ic compound Ni3Ti were less than on Ni by about 40, 30, and 20 mV, respectively. On long-term polarization at potentials in the oxy-gen evolution region, the oxygen-containing films on N i- I r and Ni-Ru alloys are predominantly composed of nickel oxide and independent of the bulk composition of the alloys themselves. This accounts for the absence of any
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Lu et al. (1978) studied this question.