Physicochemical properties and electrochemical behavior of Ebonex/Pt-based materials

Physicochem. properties and electrochem. behavior of Ebonex/Pt-based electrodes obtained with the use of a combined electrochem. method by electrodeposition of a thin platinum layer on substoichiometric titanium oxides (Ebonex) followed by heat treatment are studied. Phase compn. is found to depend substantially on the temp. of the electrode treatment. At temps. above 230°C, a titanium-dioxide-hollandite phase is formed and facilitates thermal diffusion of platinum deep into the substrate. A previously unknown titanium-oxygen phase (310°C) that affects the electrochem. behavior of the electrodes is discovered. Ebonex/Pt-based materials are found to be n-type semiconductors, the flat band potentials and the no. of charge carriers of which are detd. by the formation conditions.