Title Chemistry, phase formation, and catalytic activity of thin palladium-containing oxide films synthesized by plasma-assisted physical vapor deposition
Authors Horwat, D. , Zakharov, D. I. , ENDRINO ARMENTEROS, JOSÉ LUIS, Soldera, F. , Anders, A. , Migot, S. , Karoum, R. , Vernoux, Ph , Pierson, J. F.
External publication Si
Means Surf. Coat. Technol.
Scope Article
Nature Científica
JCR Quartile 2
SJR Quartile 1
JCR Impact 1.86700
SJR Impact 1.04100
Web https://www.scopus.com/inward/record.uri?eid=2-s2.0-79959804067&doi=10.1016%2fj.surfcoat.2010.12.021&partnerID=40&md5=3d3ebf7c8403e90c63821c9a296e4c70
Publication date 25/07/2011
ISI 000293258600037
Scopus Id 2-s2.0-79959804067
DOI 10.1016/j.surfcoat.2010.12.021
Abstract The chemistry, microstructure, and catalytic activity of thin films incorporating palladium were studied using scanning and transmission electron microscopies, X-ray diffraction, spectrophotometry, 4-point probe and catalytic tests. The films were synthesized using pulsed filtered cathodic arc and magnetron sputter deposition, i.e. techniques far from thermodynamic equilibrium. Catalytic particles were formed by thermally cycling thin films of the Pd-Pt-O system. The evolution and phase formation in such films as a function of temperature were discussed in terms of the stability of PdO and PtO(2) in air. The catalytic efficiency was found to be strongly affected by the chemical composition, with oxidized palladium definitely playing a major role in the combustion of methane. Reactive sputter deposition of thin films in the Pd-Zr-Y-O system allowed us forming microstructures ranging from nanocrystalline zirconia to palladium nanoparticles embedded in a (Zr,Y)(4)Pd(2)O matrix. The sequence of phase formation is put in relation to simple thermodynamic considerations. (C) 2010 Elsevier B.V. All rights reserved.
Keywords Noble metal oxides; Palladium; Thin films; Catalysts; Zr(4)Pd(2)O; Physical vapor deposition
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