Effect of copper oxide formation on the kinetics and mechanism of oxygen reduction reaction on copper

Oxygen Reduction Reaction (ORR) has become one of the most extensively studied electrochemical reactions due to interest for the development of polymer electrolyte fuel cells [۱]. In aqueous alkaline solutions, oxygen reduction is a multi-electron reaction that may proceed according to different pathways (Eqs. ۱-۳)O  ۲ HO  ۴e  ۴OH E۰.۴۰۱ V / SHE at pH۱۴(۱)۲۲۰O  HO  ۲e  HO   OH E۰.۴۲۷ V / SHE at pH۱۴(۲)۲۲۲۰HO   HO  ۲ e  ۳OH E۰.۹۴۲ V / SHE at pH۱۴(۳)۲۲۰The situation becomes more complicated if the electrocatalyst happens to be non-noble transition metals where the formation and involvement of the oxide layers even further complicate the mechanism [۲, ۳]. In this work ORR was studied on copper in ۱M NaOH solution in a wide range of potential and effect of copper oxide formation has been investigated on the kinetics and mechanism of ORR.

کلیدواژه ها:

Oxygen reduction ، Copper ، Copper oxide ، Alkaline solution ، Cyclic Voltammetry