Influence of thermal decomposition of salts on composition and surface morphology of TiO2/SnO2-Sb2O3/PbO2 electrodes

Abstract

Intermediate coating of SnOĩ - Sl>203 on Ti/Sn02-Sb20j/Pb02 electrodes was prepared by a thermal decomposition technique. The structure, surface morphology and durability of the layers were investigated. The results showed that, with the sample heated at 370 ‘‘C, Sb02 was formed while at 550 °c tin (Sn ) and antimony (Sb) metals appeared. At temperatiưes of 420 °c and 480 “C, a Sl>203 layer was observed, and Sn and/or Sb metal was not found. However, when the sample was heated at 480 °c, the peak intensity of Sb2Ơ3 was obviously clearer than that at a temperature of 420 °c. The best layer of SnƠ2 - Sb203 was obtained after heating of 480°c. Data from polarization technique showed that the lifetime of this electrode was up to 290 hours, while the electrodes heated at 370 °c , 420 °c, 550 °c had lifetimes of 115, 270 hours and 230 hours respectively.