Abstract: The low-temperature oxidation of polycrystalline palladium by RF oxygen plasma was studied via X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). Detailed information about the electronic states of palladium and oxygen was obtained based on the XPS curve fitting analysis of Pd3d and Pd3p + O1s lines. The results showed that Pd oxidation by oxygen plasma was different from Pd oxidation in pure O2 at high temperature. SEM shows well-structured submicron PdO particles result from oxidation in pure O2, whereas plasma oxidation results in the predominant formation of two-dimensional PdO structures covering the initial crystallites of the Pd foil. Further oxidation to a three-dimensional PdO phase occurs under prolonged treatment with oxygen plasma. The formation of a PdOx (x > 1) species, characterized by a Eb(Pd3d5/2) = 338.0–338.2 eV value that is close to the Pd4+ oxidation state, was also observed. This PdOx species was found to have low thermal stability (T < 400 K). It is proposed that the PdOx species can be localized within the boundaries of crystallites.

Cite: Kibis L.S. , Titkov A.I. , Stadnichenko A.I. , Koscheev S.V. , Boronin A.I.
X-Ray Photoelectron Spectroscopy Study of Pd Oxidation by RF Discharge in Oxygen
Applied Surface Science. 2009. V.255. N22. P.9248-9254. DOI: 10.1016/j.apsusc.2009.07.011 WOS Scopus РИНЦ ANCAN OpenAlex

Dates:

Submitted:	May 17, 2009
Accepted:	Jul 4, 2009
Published online:	Jul 10, 2009
Published print:	Aug 30, 2009

Identifiers:

Web of science:	WOS:000269075700048
Scopus:	2-s2.0-68949098385
Elibrary:	15310934
Chemical Abstracts:	2009:1030978
Chemical Abstracts (print):	151:480898
OpenAlex:	W2070964442

Citing:

DB	Citing
Web of science	166
Scopus	166
Elibrary	157
OpenAlex	169

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