析氧
过电位
材料科学
催化作用
氢氧化钴
氢氧化物
铱
电化学
化学工程
钴
无机化学
电极
化学
物理化学
冶金
工程类
生物化学
作者
Youkui Zhang,Chuanqiang Wu,Hongliang Jiang,Yunxiang Lin,Hengjie Liu,Qun He,Shuangming Chen,Tao Duan,Li Song
标识
DOI:10.1002/adma.201707522
摘要
Abstract Developing highly efficient catalysts for oxygen evolution reaction (OER) in neutral media is extremely crucial for microbial electrolysis cells and electrochemical CO 2 reduction. Herein, a facile one‐step approach is developed to synthesize a new type of well‐dispersed iridium (Ir) incorporated cobalt‐based hydroxide nanosheets (nominated as CoIr) for OER. The Ir species as clusters and single atoms are incorporated into the defect‐rich hydroxide nanosheets through the formation of rich Co–Ir species, as revealed by systematic synchrotron radiation based X‐ray spectroscopic characterizations combining with high‐angle annular dark‐field scanning transmission electron microscopy measurement. The optimized CoIr with 9.7 wt% Ir content displays highly efficient OER catalytic performance with an overpotential of 373 mV to achieve the current density of 10 mA cm −2 in 1.0 m phosphate buffer solution, significantly outperforming the commercial IrO 2 catalysts. Further characterizations toward the catalyst after undergoing OER process indicate that unique Co oxyhydroxide and high valence Ir species with low‐coordination structure are formed due to the high oxidation potentials, which authentically contributes to superior OER performance. This work not only provides a state‐of‐the‐art OER catalyst in neutral media but also unravels the root of the excellent performance based on efficient structural identifications.
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