A reduced graphene oxide encapsulating FeNiCoMnCu@rGO catalyst is prepared using a Joule heating strategy. The graphene-coated layer with high crystallinity enhances the stability of the crystal structure, resulting in superior OER activity. Rechargeable zinc-air batteries with FeNiCoMnCu@rGO demonstrate remarkable performance, boasting a high specific capacity of 800 mA h g, an impressive peak power density of 154.612 mW cm, and a cycle life of 300 hours at a current density of 10 mA cm.
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