Preparation of Co-N-C Electrocatalysts for Oxygen Reduction Reaction
Zinc-air battery is a non-polluting,long-lasting and stable energy source.However,the slow kinetic process of the cathodic oxygen reduction reaction(ORR)severely impedes its large-scale application.In this work,a surface activation strategy was proposed to construct unsaturated sites on activated carbon for anchoring Co species.Varied amount of urea was used as the nitrogen sources to obtain catalysts with different nitrogen doping.The ORR activities of these catalysts were tested and analyzed in different electrolytes.Zinc-air batteries were assembled using Co-N5-C as the cathode materials,which show an open circuit voltage of 1.441 V,which showed good discharge performance with a maximum power density of 123.5 mW·cm-2.
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