"Oxidation of Pt(111) under Near-Ambient Conditions"

D. J. Miller,: H. Öberg, S. Kaya, H. Sanchez Casalongue, D. Friebel, T. Anniyev, H. Ogasawara, H. Bluhm, L. G. M. Pettersson, A. Nilsson; Physical Review Letters, 11/04/11.

Additional Authors: H. Öberg, S. Kaya, H. Sanchez Casalongue, D. Friebel, T. Anniyev, H. Ogasawara, H. Bluhm, L. G. M. Pettersson, A. Nilsson

Abstract:

The oxidation of Pt(111) at near-ambient O2 pressures has been followed in situ using x-ray photoelectron
spectroscopy (XPS) and ex situ using x-ray absorption spectroscopy (XAS). Polarizationdependent
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 -PtO2 trilayer is identifiedÖÖÖ as the precursor to bulk oxidation.