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International Journal of Photoenergy
Volume 2019, Article ID 2571906, 15 pages
https://doi.org/10.1155/2019/2571906
Review Article

High-Field Growth of Semiconducting Anodic Oxide Films on Metal Surfaces for Photocatalytic Application

1Departamento de Química, Universidad Simón Bolívar, Apartado 89000, Caracas 1080A, Venezuela
2Departamento de Ciencia de los Materiales, Universidad Simón Bolívar, Apartado 89000, Caracas 1080A, Venezuela
3Centro de Tecnología de Materiales, Fundación Instituto de Ingeniería, Apartado 40200, Caracas 1040-A, Venezuela
4Rectorado, Universidad Metropolitana, Apartado 76819, Caracas 1070A, Venezuela

Correspondence should be addressed to Ronald Vargas; ev.bsu@sagravdlanor and Lorean Madriz; ev.bsu@zirdaml

Received 12 September 2018; Revised 21 November 2018; Accepted 2 December 2018; Published 25 February 2019

Academic Editor: Adel A. Ismail

Copyright © 2019 Ronald Vargas et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This work summarizes progresses achieved in the physical chemistry aspects of the growth of anodic oxides under high-field conditions for the synthesis of semiconducting thin solid films and their implementation as photocatalytic materials. We discuss the scope and mechanisms for anodic oxide growth, describing the development of kinetic models and the correlations between theory and kinetic data, leading to fundamental information to characterize the primary processes occurring during the anodization of valve metals under high fields. The main features related to the widely used self-assembly of nanostructures by valve metal anodization are highlighted and briefly discussed. This is followed by general considerations of heterogeneous photocatalysis on these functional materials, considering the kinetics of the heterogeneous catalytic processes involved and the overall photoelectrochemical performance. High control of the characteristics of the materials obtained with the method described, combined with the possibility of electrochemically assisting photocatalysis, allows application of this technology to the treatment of wastewaters, energy conversion, and related fields.