首页|Co/Co7Fe3 heterostructures with controllable alloying degree on carbon spheres as bifunctional electrocatalyst for rechargeable zinc-air batteries
Co/Co7Fe3 heterostructures with controllable alloying degree on carbon spheres as bifunctional electrocatalyst for rechargeable zinc-air batteries
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Exploring efficient and nonprecious metal electrocatalysts of oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)is crucial for developing rechargeable zinc-air batteries(ZABs).Herein,an alloying-degree control strategy was employed to fab-ricate nitrogen-doped carbon sphere(NCS)decorated with dual-phase Co/Co7Fe3 heterojunctions(CoFe@NCS).The phase composition of materials has been adjusted by controlling the alloying degree.The optimal CoFe0.08@NCS electrocatalyst displays a half-wave poten-tial of 0.80 V for ORR and an overpotential of 283 mV at 10 mA·cm-2 for OER in an alkaline electrolyte.The intriguing bifunctional electrocatalytic activity and durability is attributed to the hierarchically porous structure and interfacial electron coupling of highly-active Co7Fe3 alloy and metallic Co species.When the CoFe0.08@NCS material is used as air-cathode catalyst of rechargeable liquid-state zinc-air battery(ZAB),the device shows a high peak power-density(157 mW·cm-2)and maintains a stable voltage gap over 150 h,out-performing those of the benchmark(Pt/C+RuO2)-based device.In particular,the as-fabricated solid-state flexible ZAB delivers a reliable compatibility under different bending conditions.Our work provides a promising strategy to develop metal/alloy-based electrocatalysts for the application in renewable energy conversion technologies.
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