Table of Contents Author Guidelines Submit a Manuscript
International Journal of Photoenergy
Volume 2015 (2015), Article ID 457980, 8 pages
Research Article

Photocorrosion Mechanism of TiO2-Coated Photoanodes

1Materials for Energy Conversion and Storage, Faculty of Applied Sciences, Delft University of Technology, Julianalaan 136, 2628 BL Delft, Netherlands
2Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Institute for Solar Fuels, Hahn-Meitner-Platz 1, 14109 Berlin, Germany

Received 10 May 2015; Accepted 13 July 2015

Academic Editor: Antoni Morawski

Copyright © 2015 Arjen Didden 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.


Atomic layer deposition was used to coat CdS photoanodes with 7 nm thick TiO2 films to protect them from photocorrosion during photoelectrochemical water splitting. Photoelectrochemical measurements indicate that the TiO2 coating does not provide full protection against photocorrosion. The degradation of the film initiates from small pinholes and shows oscillatory behavior that can be explained by an Avrami-type model for photocorrosion that is halfway between 2D and 3D etching. XPS analysis of corroded films indicates that a thin layer of CdS remains present on the surface of the corroded photoanode that is more resilient towards photocorrosion.