析氧
铱
过电位
塔菲尔方程
分解水
催化作用
化学工程
活动站点
化学
材料科学
光催化
物理化学
电化学
有机化学
电极
工程类
作者
Kang Jiang,Ming Luo,Ming Peng,Yaqian Yu,Ying‐Rui Lu,Ting‐Shan Chan,Pan Liu,Frank M. F. de Groot,Yongwen Tan
标识
DOI:10.1038/s41467-020-16558-1
摘要
Abstract Designing efficient single-atom catalysts (SACs) for oxygen evolution reaction (OER) is critical for water-splitting. However, the self-reconstruction of isolated active sites during OER not only influences the catalytic activity, but also limits the understanding of structure-property relationships. Here, we utilize a self-reconstruction strategy to prepare a SAC with isolated iridium anchored on oxyhydroxides, which exhibits high catalytic OER performance with low overpotential and small Tafel slope, superior to the IrO 2 . Operando X-ray absorption spectroscopy studies in combination with theory calculations indicate that the isolated iridium sites undergo a deprotonation process to form the multiple active sites during OER, promoting the O–O coupling. The isolated iridium sites are revealed to remain dispersed due to the support effect during OER. This work not only affords the rational design strategy of OER SACs at the atomic scale, but also provides the fundamental insights of the operando OER mechanism for highly active OER SACs.
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