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Electrochemical studies were done on thin Co304 and NiCo204 films on Ti by cyclic voltammetric and potentiostatic polarization techniques. The films were quite conductive and prevented the underlying surface from playing a harmful role during measurements. The results indicated the formation of a surface quasi-reversible redox couple, CoW/Co m, in KOH solution. The reaction order with respect to OH-ion concentration was found to be nearly 2. The Tafel slopes decreased with increasing KOH concentrations. NiCo204 was observed to evolve oxygen gas at a lower overpotential as compared to that of Co304. Electrode kinetic parameters suggest similar mechanisms for the oxygen evolution for both the oxides.

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