Anodic Electro Deposition of CeO 2 and Co-Doped CeO 2 Thin Films

Abstract

CeO2 and Co containing CeO2 thin films were deposited on indium tin oxide and stainless steel by anodic electrodeposition. Scanning electron microscopy showed that the films are flat and show globular morphology and cracks resulting from volume shrinking. According to XRD and Raman Spectroscopy pure ceria layers are crystalline, while the presence of Co induces the formation of amorphous films. The good adhesion and the compactness allowed the photoelectrochemical characterization of the films. A band gap value of 2.9 eV was estimated for CeO2, while slightly higher values (?3.0 eV) were estimated for Co containing films. A mechanism for ceria anodic electrodeposition is proposed and discussed. ? 2013 The Electrochemical Society.