ELECTROCHEMICAL AND ELECTROCHROMIC ASPECTS OF POROUS TITANIA GLASS

Electrochemical and photoelectrochemical properties of porous titania glass (PTG) electrodes in aqueous electrolytes were studied systematically paying special attention to the effects of micropores in the material. Because of its open-porous structure, current-potential characteristics of the PTG electrodes reached a steady state only after the electrolytes soaked into the micropores. The magnitude of the stationary anodic dark current was dependent upon the annealing temperature of the PTG in a hydrogen atmosphere. The dark current was found to be the consequence of charge transfer at the metal electrode (Pt) attached to the PTG back surface.