Preparation, properties, and catalytic activity of platinum-modified plasma electrolytic oxide structures on aluminum

• Published in: Russian journal of inorganic chemistry Vol. 56; no. 9; pp. 1429 - 1435
• Main Authors: Tyrina, L. M., Rudnev, V. S., Nedozorov, P. M., Ustiniov, A. Yu, Lukiyanchuk, I. V., Kaidalova, T. A.
• Format: Journal Article
• Language: English
• Published: Dordrecht SP MAIK Nauka/Interperiodica 01-09-2011
• Subjects: Aluminum; Catalytic activity; Chemistry; Chemistry and Materials Science; Inorganic Chemistry; Oxidation; Oxide coatings; Oxides; Physical Methods of Investigation; Platinum; Surface chemistry; X-rays; Chloroplatinic Acid; Plasma Electrolytic Oxidation Coating; Electrostatic Force Microscopy; Microarc Oxidation; Plasma Electrolytic Oxidation
• ISSN: 0036-0236; 1531-8613
• DOI: 10.1134/S0036023611090300

Catalytically active Pt-containing oxide composites on aluminum have been prepared by plasma electrolytic oxidation (PEO) and by additional modification of the resulting coating by impregnation with an aqueous solution of chloroplatinic acid followed by calcination. The oxide film/metal composites have been characterized by X-ray diffraction, X-ray photoelectron spectroscopy, and electron microscopy. The modified films contain the γ-Al
2
O
3
and Pt crystalline phases. Platinum in the surface and subsurface layers is in the Pt
0
state. There are platinum-rich areas on the surface of the PEO films. A higher catalytic activity in CO oxidation into CO
2
is shown by the samples whose oxide film contains nickel and copper along with platinum.