Co/CoFe heterostructures with controllable alloying degree on carbon spheres as bifunctional electrocatalyst for rechargeable zinc-air batteries
International Journal of Minerals, Metallurgy and Materials, ISSN: 1869-103X, Vol: 32, Issue: 2, Page: 476-487
2025
- 14Citations
- 7Captures
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Article Description
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 fabricate nitrogen-doped carbon sphere (NCS) decorated with dual-phase Co/CoFe heterojunctions (CoFe@NCS). The phase composition of materials has been adjusted by controlling the alloying degree. The optimal CoFe@NCS electrocatalyst displays a half-wave potential of 0.80 V for ORR and an overpotential of 283 mV at 10 mA·cm 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 CoFe alloy and metallic Co species. When the CoFe@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) and maintains a stable voltage gap over 150 h, outperforming those of the benchmark (Pt/C+RuO)-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.
Bibliographic Details
Springer Science and Business Media LLC
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