Electrodeposited Ni–Co-oxide electrodes:characterization and kinetics of the oxygen evolution reaction

In this paper we present results on the characterization of Ni–Co-oxide electrodes, prepared by anodic deposition from Co(NO3)2 aqueous solutions on Ni substrates. The kinetics and mechanism of oxygen evolution was analysed. Tafel slopes close to 40 mV per decade were measured. The reaction order with respect to [OH−] was found to be approximately 2 at 25°C. A possible mechanism for oxygen evolution on these electrodes is presented, which accounts for the values of the kinetic parameters experimentally obtained.