The electrochemical properties of semiconducting anodes of TiO//2, SrTiO//3, BaTiO//3, Fe//2O//3, CdO, CdFe//2O//4, Wo//3, PbFe//1//2O//1//9, 2Ti//1//. //5W//0//. //5O//6//. //5, Hg//2Ta//2O//7, and Hg//2Nb//2O//7 in photoassisted electrolysis of water were determined. All of these oxides formed a rectifying junction with the electrolyte and anodic photocurrents were generated only with larger-than-band-gap illumination. For Fe//2O//3, the optical absorption spectrum was different from the photoelectrochemical spectrum due to crystal field transitions. These oxides were found to be stable over certain range of pH. In a given electrolyte, the flatband potential V//f//b varied linearly with the band gap. A good correlation was obtained between V//f//b and the calculated heat of formation of the oxide per metal atom per metal-oxygen bond, but not between V//f//b and the calculated Fermi energy of the oxide.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Physics and Astronomy (miscellaneous)