析氧
材料科学
氧气
双功能
钴
化学工程
催化作用
碳纤维
无机化学
化学
克拉克电极
电极
电化学
有机化学
复合数
电解质
工程类
物理化学
复合材料
作者
Arshad Aijaz,Justus Masa,Christoph Rösler,Wei Xia,Philipp Weide,Alexander Botz,Roland A. Fischer,Wolfgang Schuhmann,Martin Mühler
标识
DOI:10.1002/anie.201509382
摘要
Efficient reversible oxygen electrodes for both the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) are vitally important for various energy conversion devices, such as regenerative fuel cells and metal-air batteries. However, realization of such electrodes is impeded by insufficient activity and instability of electrocatalysts for both water splitting and oxygen reduction. We report highly active bifunctional electrocatalysts for oxygen electrodes comprising core-shell Co@Co3O4 nanoparticles embedded in CNT-grafted N-doped carbon-polyhedra obtained by the pyrolysis of cobalt metal-organic framework (ZIF-67) in a reductive H2 atmosphere and subsequent controlled oxidative calcination. The catalysts afford 0.85 V reversible overvoltage in 0.1 m KOH, surpassing Pt/C, IrO2 , and RuO2 and thus ranking them among one of the best non-precious-metal electrocatalysts for reversible oxygen electrodes.
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