OXYGEN EVOLUTION AT NICKEL ANODES IN CONCENTRATED ALKALINE-SOLUTION

Oxide coated nickel electrodes were investigated in concentrated alkal ine solutions. Their electrochemical behaviour was studied in the pote ntial regime between the double layer capacity region and the oxygen e volution, at 20, 50 and 80 degrees C. Cyclic voltammograms and quasi-s teady-state current-potential curves change remarkably with temperatur e, correspondingly, the impedance of the system changes strongly with potential, but also with temperature. The experimental results do not support the Krasilshchikov mechanism suggested by many authors.