In Situ Oxidation Study of Pt(110) and Its Interaction with CO

被引：114

作者：

Butcher, Derek R. ^{[2
,5
]}

Grass, Michael E. ^{[1
,5
]}

Zeng, Zhenhua ^{[2
]}

Aksoy, Funda ^{[3
,5
]}

Bluhm, Hendrik ^{[5
]}

Li, Wei-Xue ^{[2
]}

Mun, Bongjin S. ^{[1
]}

Somorjai, Gabor A. ^{[4
,5
]}

Liu, Zhi ^{[5
]}

机构：

[1] Hanyang Univ, Dept Appl Phys, ERICA, Seoul 426791, South Korea

[2] Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

[3] Nigde Univ, Dept Phys, Fac Arts & Sci, Nigde, Turkey

[4] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA

[5] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2011年 / 133卷 / 50期

基金：

美国国家科学基金会;

关键词：

PT-GROUP METALS; AMBIENT-PRESSURE; PHOTOELECTRON-SPECTROSCOPY; LEVEL SHIFTS; SURFACE; PLATINUM; NANOPARTICLES; PHOTOEMISSION; PALLADIUM; KINETICS;

D O I：

10.1021/ja207261s

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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.

引用

页码：20319 / 20325

页数：7

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