催化作用
Atom(片上系统)
氧原子
氧气
析氧
化学
材料科学
化学工程
化学物理
物理化学
分子
有机化学
计算机科学
电极
工程类
电化学
嵌入式系统
作者
Congxiao Wang,Luyao Zhang,Wei-Wei Wang,Feng Yang,Chun‐Jiang Jia
标识
DOI:10.1021/acscatal.4c01561
摘要
The oxygen transfer from the support surface to the metal catalyst, so-called reverse oxygen spillover, is of immense interest in heterogeneous catalysis, but how exactly it influences the structure reconstruction of metal catalysts and evolution of the real active sites during reactions remains unclear. Herein, we reveal the dynamic evolution of the Ni species caused by the reverse oxygen spillover of CeO2 under the water gas shift reaction conditions using in situ scanning transmission electron microscopy and in situ infrared spectroscopy. The direct, atom-resolved evidence shows that the tiny Ni0 nanoparticles in situ formed during the reaction subsequently underwent oxidation and collapse as temperature decreased after the reaction and eventually spread out and redispersed on the CeO2 surface as Ni single atoms. The spontaneous redispersion of the metal during the reaction induced by the reverse oxygen spillover is of general importance for understanding the catalytic mechanisms.
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