期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 133, 期 50, 页码 20319-20325出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja207261s
关键词
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资金
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
- National Science Foundation of China [20873142, 20923001]
- Ministry of Science and Technology of China [2007CB815205]
- Korea Research Foundation (KRF)
- Korean government (MEST) [2009-0068720]
- ALS
- National Research Foundation of Korea [2009-0068720] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Many interesting structures have been observed for O-2-exposed Pt(110). These structures, along with their stability and reactivity toward 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 of O-2), nanometer-sized islands of multilayered alpha-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 dose 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.
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