Abstract: | The competitive photo-oxidation of Ce3+ on the surface of n-TiO2 electrode before and after deposition of porous Ir-needles was studied by using rotating ring-disc electrode with interchangeable disc. It was found that highly dispersed porous layer composed of Ir needles could catalyse the photo-oxidation of Ce3+. Basic postulates of catalyst of photoelectrochemical reactions were discussed. |