Reduction of the Electrode Overpotential of the Oxygen Evolution Reaction by Electrode Surface Modification

Figure 5

Life cycle test for a simulated metal–air battery. The Ni/Sn/Ni mesh was used as the OER electrode during charging. The ORR electrode used was a commercial ORR electrode used in a proton-exchange membrane fuel cell. A Pt wire was used as the metal side electrode. The battery electrolyte was a 6 M KOH solution. A constant current of 1 mA flowed through the OER and ORR electrodes during charging and discharging, respectively.