In situ spectroscopic study of the oxidation and reduction of Pd(111)

Guido Ketteler; D Frank Ogletree; Hendrik Bluhm; Hongjian Liu; Eleonore L D Hebenstreit; Miquel Salmeron

doi:10.1021/ja055754y

In situ spectroscopic study of the oxidation and reduction of Pd(111)

J Am Chem Soc. 2005 Dec 28;127(51):18269-73. doi: 10.1021/ja055754y.

Authors

Guido Ketteler¹, D Frank Ogletree, Hendrik Bluhm, Hongjian Liu, Eleonore L D Hebenstreit, Miquel Salmeron

Affiliation

¹ Lawrence Berkeley National Laboratories, Materials Sciences Division, University of California, Berkeley, California 94720, USA. gketteler@lbl.gov

PMID: 16366581
DOI: 10.1021/ja055754y

Abstract

Using a photoemission spectroscometer that operates close to ambient conditions of pressure and temperature we have determined the Pd-O phase diagram and the kinetic parameters of phase transformations. We found that on the (111) surface oxidation proceeds by formation of stable and metastable structures. As the chemical potential of O2 increases chemisorbed oxygen forms followed by a thin surface oxide. Bulk oxidation is a two-step process that starts with the metastable growth of the surface oxide into the bulk, followed by a first-order transformation to PdO.