Nickel -cobalt oxide coated electrodes: influence of the preparation technique on oxygen evolution reaction (OER) in an alkaline solution

The oxygen evolution reaction "OER# was investigated at 59>C in 04 wt) NaOH solution on NiCo1O3 electrodes[ NickelÐcobalt oxides were obtained by di}erent preparation techniques and they were applied to chemically pickled nickel plates[ Fresh and arti_cially aged electrodes were subjected to electrochemical tests[ The ageing was performed for 10 days[ The correlation between the coating preparations and their electrochemical performances was investigated by analysis of the electrochemical data[ The e.ciency of the NiCo1O3 electrodes changed signi_cantly with the changing of the preparation method[ Two Tafel slopes for the OER were observed in most cases[ This behaviour was interpreted on the basis of a change in the valence state of the oxide[ The kinetic parameters obtained on NiCo1O3 electrodes were compared and discussed according to the preparation methods[ Þ 0888 International Association for Hydrogen Energy[ Published by Elsevier Science Ltd[ All rights reserved[