Melamine-assisted pyrolytic synthesis of bifunctional cobalt-based core-shell electrocatalysts for rechargeable zinc-air batteries

• 作者: Jiqing Jiao Yuan Pan Bin Wang Wenjuan Yang Shoujie Liu Chao Zhang
• 来源期刊: 能源化学
• 年，卷（期）: 2021,（2）
• 页码范围: 364-371
• 页数: 8页
• 语种: 英文

摘要

Designing a highly active-and stable non-noble metal bifunctional oxygen catalyst for rechargeable Zn-air battery remains a great challenge.Herein,we develop a facile and melamine-assisted-pyrolysis (MAP) strategy for the synthesis of core-shell Co-based electrocatalysts@N-doped carbon nanotubes (Co@CNTs) derived from metal-organic frameworks.The Co@CNTs exhibited excellent bifunctional electrocatalytic performance for both oxygen evolution and reduction.DFT calculations demonstrated that the Gibbs free energy of the rate-determining step was small enough to improve ORR activities.As a result,a Zn-air battery assembled with Co@CNTs proves a lager power density,low voltage gap between charge-discharge and excellent stability.Thus,this work offers a facile strategy to realize the synthesis of non-noble metal electrocatalyst for Zn-air battery materials with high electrochemical performance.