Oxidation of Pt(111) under Near-Ambient Conditions

被引：155

作者：

Miller, D. J. ^{[1
,2
]}

Oberg, H. ^{[3
]}

Kaya, S. ^{[2
]}

Casalongue, H. Sanchez ^{[2
]}

Friebel, D. ^{[1
,2
]}

Anniyev, T. ^{[1
,2
]}

Ogasawara, H. ^{[2
]}

Bluhm, H. ^{[4
,5
]}

Pettersson, L. G. M. ^{[3
]}

Nilsson, A. ^{[1
,2
,3
]}

机构：

[1] Stanford Inst Mat & Energy Sci, SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA

[2] SLAC Natl Accelerator Lab, Stanford Synchrotron Radiat Lightsource, Menlo Pk, CA 94025 USA

[3] Stockholm Univ, AlbaNova Univ Ctr, Dept Phys, S-10691 Stockholm, Sweden

[4] Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source, Berkeley, CA 94720 USA

[5] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Chem Sci, Berkeley, CA 94720 USA

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 107卷 / 19期

关键词：

ATOMIC OXYGEN; GAS-PHASE; SPECTROSCOPY; SURFACE; OXIDE; KINETICS;

D O I：

10.1103/PhysRevLett.107.195502

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The oxidation of Pt(111) at near-ambient O-2 pressures has been followed in situ using x-ray photoelectron spectroscopy (XPS) and ex situ using x-ray absorption spectroscopy (XAS). Polarization-dependent XAS signatures at the O K edge reveal significant temperature-and pressure-dependent changes of the Pt-O interaction. Oxide growth commences via a PtO-like surface oxide that coexists with chemisorbed oxygen, while an ultrathin alpha-PtO2 trilayer is identified as the precursor to bulk oxidation. These results have important implications for understanding the chemical state of Pt in catalysis.

引用

页数：5

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