Electrochemical properties of thermally treated platinized Ebonex (R) with low content of Pt

Effect of thermal treatment on the physicochem. and electrochem. properties of platinized Ebonex electrodes, contg. low amt. of Pt was studied. New phases in systems Ti-O (310°) and Pt-Ti-O (410°) were found for treated Ebonex that affects electrochem. behavior of electrodes. Ebonex/Pt-electrodes are n-type highly doped semiconductors, as well as Ebonex. Increase in treatment temp. leads to both oxidn. of Ti suboxides and diffusion of Pt deep into substrate and results in shift of flatband potential to pos. values and decrease in donor concn. as a rule. The peak of redn. of Pt phase oxides on the cathodic branch of voltammograms could be correlated with electrocatalytic activity of platinized Ebonex-electrodes since it characterizes the amt. of electrochem. active Pt on the electrode surface. Thermally treated platinized Ebonex anodes could be applied in a trivalent Cr electroplating bath.