材料科学
催化作用
石墨烯
电池(电)
化学工程
电极
传质
金属
蚀刻(微加工)
纳米技术
冶金
化学
有机化学
功率(物理)
物理化学
色谱法
工程类
物理
量子力学
图层(电子)
作者
Junli Wu,Ji‐Jun Zou,W. Zhang,J. Li,Zhihong Yang,Konggang Qu,Yan-zhe Li,Weiwei Cai
标识
DOI:10.1016/j.mtener.2020.100438
摘要
Metal-air battery, represented by zinc-air battery (ZAB), is recognized as a promising secondary battery technology with great energy density. Since the catalyst in the air-electrode must simultaneously catalyze oxygen evolution reaction (OER) and oxygen reduction reaction (ORR), mass transfer structure of the air-electrode catalyst would significantly affect the ZAB performance. A facile selectively etching strategy is therefore proposed to in situ adjusting the mass transfer structure of the CoFe OER/ORR bi functional catalyst encapsulated in graphene cage. This graphene encapsulated CoFe catalyst with optimized mass transfer channel exhibits superior OER and ORR activity to IrO2 and Pt/C, respectively. The corresponding ZAB performance is therefore tripled compared with that equipped with Pt/C–IrO2 catalysts in terms of maximum power density (206 mW/cm2). Together with the satisfied stability, this facilely synthesized CoFe catalyst shows promising application potential in metal-air batteries.
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