Plasma electrolytic oxide layers as promising systems for catalysis

• Published in: Surface & coatings technology Vol. 307; pp. 1183 - 1193
• Main Authors: Lukiyanchuk, I.V., Rudnev, V.S., Tyrina, L.M.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15-12-2016
• Subjects: Nanostructures; Plasma electrolytic oxidation; Surface morphology; Plasma electrolytic oxidation; Surface morphology; Nanostructures
• ISSN: 0257-8972; 1879-3347
• DOI: 10.1016/j.surfcoat.2016.06.076

The paper overviews the various approaches for obtaining the metal-supported PEO layers with a developed surface. They are following: (1) pre-etching the metal surfaces, (2) using the electrolytes in which linear discharges are realized under certain conditions of PEO processing, (3) the use of oxide-forming electrolytes for obtaining ornamental structures, (4) applying the electrolytes with isopoly and heteropoly anions in which islet growth of coral-like structures is possible. It is shown that changing the composition and pH of the electrolyte, the electrical parameters of PEO processing you can control the sizes of surface relief fragments such as pores, micro- and nanostructures and create conditions for the formation of developed surface and secondary layers. Using PEO structures as a substrate for subsequent deposition of the catalytically active components by methods of impregnation, extraction, and sol-gel synthesis allows one to form the developed surfaces with nanowires, nanospheres, hedgehog-like structures too. Application of the discussed methods may improve the efficiency of catalysts formed using PEO technology.
•The approaches for obtaining PEO layers with a developed surface were overviewed.•Single-stage PEO and its combination with other methods are two groups of the approaches.•Electrolytes with IPAs and HPAs, oxide-forming and dissolving components are promising.•PEO+impregnation or template sol-gel synthesis is promising for surface increasing.