Photoelectrochemical behavior of WO3 and TiO2 films modified with cobalt-based oxygen evolution catalyst

Continuous tungsten trioxide (WO3) and porous titanium dioxide (TiO3) films on AISI304 type steel were prepared by electrochemical methods. The morphology and structure of the obtained films were studied by X-ray diffraction analysis and scanning electron microscopy. Oxygen evolution catalyst containing cobalt-phosphate compound was deposited photochemically onto the surface of semiconductor particles. The photoelectrochemical properties of the prepared electrodes were investigated in neutral 0.1 M phosphate buffer solutions. The voltammetric characteristics revealed that the presence of cobalt-based catalyst effectively changes the photoelectrocatalytic activity of WO3 and TiO3 particles. The influence of some synthesis parameters (type of cobalt(II) salt, photodeposition time) on the electrochemical properties of the prepared electrodes was evaluated experimentally.