期刊
APPLIED SURFACE SCIENCE
卷 255, 期 16, 页码 7296-7301出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2009.03.086
关键词
Bimetallic catalysts; Dynamic surface process; Oxidation; Reduction; XPS
类别
资金
- National Natural Science Foundation of China [90206036, 20573107, 20603037]
- Ministry of Science and Technology of China
- Chinese Academy of Sciences
The surface states of supported PtNi nanoparticles treated at alternating O-2 and H-2 atmosphere were studied by X-ray photoelectron spectroscopy. Reversible structural changes at the surfaces of the supported PtNi nanoparticles in response to reaction gases were observed, showing NiO-rich surface in oxidizing gases and Pt-rich surface in reducing gases. The dynamic behaviors can be attributed to two opposite gas-driven mass transport processes at bimetallic particle surfaces, including surface segregation of Pt at the bimetallic particles in H-2 and encapsulation of the particles by NiO in O-2. The similar surface structural changes can be observed in other bimetallic catalyst systems, as exemplified in supported PtCu and PtCo nanoparticles. (C) 2009 Elsevier B. V. All rights reserved.
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