Chemistry, phase formation, and catalytic activity of thin palladium-containing oxide films synthesized by plasma-assisted physical vapor deposition
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 PtO2 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)4Pd2O matrix. The sequence of phase formation is put in relation to simple thermodynamic considerations.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- Accelerator& Fusion Research Division
- DOE Contract Number:
- DE-AC02-05CH11231
- OSTI ID:
- 1007495
- Report Number(s):
- LBNL-4154E; SCTEEJ; TRN: US201106%%276
- Journal Information:
- Surface and Coatings Technology, Journal Name: Surface and Coatings Technology; ISSN 0257-8972
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
AIR
CHEMICAL COMPOSITION
CHEMISTRY
COMBUSTION
DEPOSITION
EFFICIENCY
ELECTRONS
MAGNETRONS
METHANE
MICROSTRUCTURE
OXIDES
PALLADIUM
PHYSICAL VAPOR DEPOSITION
PROBES
SPECTROPHOTOMETRY
STABILITY
THERMODYNAMICS
THIN FILMS
X-RAY DIFFRACTION
noble metal oxide films
palladium
plasma-assited deposition
physical vapor deopsition