Atomic structures and local electronic properties of K- and Rh-modified ceria/Pt(111) inverse model catalysts

Ceria has been widely applied as a support in heterogeneous catalysis due to its unique capability to store and release oxygen. As a typical inverse model catalyst, a ceria/Pt(111) system has attracted much attention due to its strong metal-oxide interaction. The structural and electronic properties...

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Veröffentlicht in:The Journal of chemical physics 2019-11, Vol.151 (18), p.184703-184703
Hauptverfasser: Chen, Haoran, Rong, Wenhui, Huang, Zhichao, Peng, Zhantao, Xu, Zhen, Zhou, Junyi, Di, Bin, Zhou, Xiong, Wu, Kai
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Sprache:eng
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Zusammenfassung:Ceria has been widely applied as a support in heterogeneous catalysis due to its unique capability to store and release oxygen. As a typical inverse model catalyst, a ceria/Pt(111) system has attracted much attention due to its strong metal-oxide interaction. The structural and electronic properties of the ceria/Pt(111) system can be effectively modified by the introduction of alien K and Rh atoms. Here, the K- and Rh-modified ceria/Pt(111) inverse model catalysts have been investigated with high resolution scanning tunneling microscopy and apparent local work function measurement. The experimental results indicate that the K atoms prefer to occupy the top sites of the stoichiometric ceria, while the Rh atoms are prone to stay at the electron-rich ceria island edges. The K and Rh atoms act as an electron donor and acceptor on ceria/Pt(111), respectively. Such a study on the modification of the ceria-based catalysts should help understand strong metal-oxide interaction in heterogeneous catalysis at the atomic level.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.5128960