Characterization of DSA-type coatings with nominal composition Ti/Ru{sub}0.3Ti{sub}(0.7-x)Sn{sub}xO{sub}2 prepared via a polymeric precursor

摘要

A ternary coating with the nominal composition Ru{sub}0.3Ti{sub}(0.7 - x)Sn{sub}xO{sub}2 deposited on a Ti substrate has been prepared by thermal decomposition of RuCl{sub}3 and polymeric precursors of tin and titanium (400 ℃) (Pechini method). Surface morphology, microstructure and electrocatalytic activity of the coating were investigated by cyclic voltammetry, X-ray diffraction, scanning electron microscopy and energy-dispersive X-ray spectrometry. The aim of this work was to prepare electrochemical devices based on ternary oxides showing high stability during the oxygen evolution reaction. Accelerated life tests, performed at 1.0 mol dm{sup}(-3) in aqueous HClO{sub}4, with an anodic current of 400 mA cm{sup}(-2), showed that the polymeric precursor maintains both a good yield between nominal and experimental composition and favours higher coating stability (5×) compared with a traditional method of thermal decomposition of the chloride precursor. The deactivation mechanism is also discussed.