Document Detail

In-situ Oxidation Study of Pt(110) and its Interaction with CO.
MedLine Citation:
PMID:  22070406     Owner:  NLM     Status:  Publisher    
Many interesting structures have been observed on O2-exposed Pt(110). These structures, along with their stability and reactivity towards CO provide insights into catalytic processes on open Pt surfaces, which have similarities to Pt nanoparticle catalysts. In this study, we present results from ambient pressure X-ray photoelectron spectroscopy, high pressure scanning tunneling microscopy, and density functional theory calculations. At low oxygen pressure, only chemisorbed oxygen is observed on the Pt(110) surface. At higher pressure (0.5 Torr O2), nanometer-sized islands of multilayered α-PtO2-like surface oxide form along with chemisorbed oxygen. Both chemisorbed oxygen and the surface oxide are removed in the presence of CO and the rate of disappearance of the surface oxide is close to that of the chemisorbed oxygen at 270 K. The spectroscopic features of the surface oxide are similar to the oxide observed on Pt nanoparticles of a similar size, which provides us an extra incentive to revisit some single crystal model catalyst surfaces under elevated pressure using in-situ tools.
Derek R Butcher; Michael Edward Grass; Zhenhua Zeng; Funda Aksoy; Hendrik Bluhm; Wei-Xue Li; Bongjin Simon Mun; Gabor A Somorjai; Zhi Liu
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-11-8
Journal Detail:
Title:  Journal of the American Chemical Society     Volume:  -     ISSN:  1520-5126     ISO Abbreviation:  -     Publication Date:  2011 Nov 
Date Detail:
Created Date:  2011-11-10     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7503056     Medline TA:  J Am Chem Soc     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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