On the Mechanism of Formation of Electrochromic WO 3 Films on the Surface of Sn, Ti, ITO Electrodes in the Process of Cathodic Electrodeposition

—The mechanism of the electrochemical formation of WO 3 films on the surface of titanium, tin, and ITO electrodes is investigated under various regimes, including the deposition time τ = 2000–8000 s and the electrochemical potential of deposition on the cathode in the range from –0.4 to –1 V. A technique for the synthesis of peroxytungstic acid and a method of cathodic electrodeposition are presented. The studies carried out with tin and titanium extend the field of application of WO 3 films to technologies of chemical current sources and fuel cells.