CHARACTERISTICS OF PT THIN-FILMS ON THE CONDUCTING CERAMICS TIO AND EBONEX (TI4O7) AS ELECTRODE MATERIALS

Electrochemical properties and morphologies of platinum thin films on the conductive ceramics TiO and Ebonex (Ti4O7) have been examined. Whi le Ebonex is known to be good material for an electrode substrate, the electrodeposition of Pt at the Ebonex surfaces requires high overpote ntials, which results in the growth of Pt grains with large holes prob ably caused by H-2 evolution at the electrode surfaces from the electr olyte solution. After scanning a few decades of potential cycles betwe en far positive and negative ranges continuously, the platinum films b ecome more densely packed and spread evenly. TiO shows better characte ristics as a substrate for electodeposition of platinum. The electroch emical properties of the Pt-deposited TiO is the same as those of the Pt electrode.