Knysh V. Electrodeposition of composite oxide materials PbO2 - TiO2 and PbO2 - ZrO2 from suspension electrolytes

Studing regularities of electrodeposition of composite materials based on PbO2 with adjusted composition. The aim of this work is the establishment of regularities of composite materials based on lead dioxide and deposited from suspension electrolytes containing TiO2, ZrO2 and Ti as dispersed phase; to finding correlation between electrolyte composition, electrodeposition conditions, physicochemical properties and electrocatalytic activity of composites. It was shown that particles of dispersed phase are charged positively in the suspension solution and they may aggregate in presents Pb2+. Advanced colloidal-chemical mechanism of the composite electrodeposition from suspension electrolytes was proposed. The composition of coatings depends on electrolysis conditions, composition and colloidal-chemical properties of the electrolyte. It was shown that overpotential of oxygen evolution reaction is increased in the presence of TiO2, ZrO2, and Ti in the composite. It is important to note that the rate of MTBE electrochemical oxidation at the PbO2 - TiO2 composite is increased twice in comparison with PbO2 anode. Application UV-irradiation at PbO2 - TiO2 composite anode led to increase of MTBE electrochemical oxidation too. Proposed composite materials have in a few times longer service life in comparison with PbO2 anodes.