Effects of the geometry and operating temperature on the stability of Ti/IrO2-SnO2-Sb2O5electrodes for O2evolution

Xusong Qin, Furong Gao, Guohua Chen

Research output: Journal article publicationJournal articleAcademic researchpeer-review

19 Citations (Scopus)

Abstract

Ternary IrO2-Sb2Os-SnO2anode has shown its superiorities over IrO2and many other electrocatalysts for O2evolution, in terms of electrochemical stability, activity and cost. The performance of IrO2-Sb2O5-SnO2anodes is affected by its electrochemical properties and operating conditions. In this paper, the electrochemical stability and activity of the Ti/IrO2-Sb2O5-SnO2anodes prepared with three different geometries were investigated under different operating conditions. It was found that anodes with large mean curvature have high electrochemical stability. Although increasing temperature results in a decrease in the stability of Ti/IrO2-Sb2O5-SnO2, the anode with a mean curvature of 200 m-1still shows acceptable service life even at 70°C. This tolerance of high temperature was attributed to the thermal expansion difference between the substrate and the coating layer, the redox window for Ir(V)Z Ir(IV) conversion, and the redox reversibility of Sb and Sn species in the coating layer. 2010.
Original languageEnglish
Pages (from-to)1797-1805
Number of pages9
JournalJournal of Applied Electrochemistry
Volume40
Issue number10
DOIs
Publication statusPublished - 1 Oct 2010
Externally publishedYes

Keywords

  • DSA
  • Electrochemical process
  • Geometry effect
  • High temperature
  • Metal oxide anode
  • Service life

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry
  • Materials Chemistry

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