Cobalt, iron, and nitrogen co-doped graphene coated ceramic nanowire-based bifunctional oxygen electrocatalyst for Zn-air battery

Structural and elemental composition of several graphene-coated Al2O3 nanowire-based cat- alyst materials prepared by functionalization with dicyandiamide and Fe and Co salts via pyrolysis were studied using several physical characterisation methods. Electrocatalytic ox- ygen reduction reaction (ORR) activity of the materials was studied using the rotating disk electrode method in a 0.1 M KOH solution. Using the same method, the oxygen evolution reaction activity was studied for the catalyst material with the highest ORR activity. Addi- tionally, the catalyst’s rechargeable Zn-air battery performance was assessed, showing su- perior power output and cycle life than those of a commercial Pt-Ru/C catalyst