Investigation of IrO 2 -SnO 2 thin film evolution from aqueous media

Lourdes Vázquez-Gómez, Erzsébet Horváth, János Kristóf, Ákos Rédey, Achille De Battisti

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The thermal evolution process of IrO 2 -SnO 2 /Ti mixed oxide thin films of varying noble metal content has been investigated under in situ conditions by thermogravimetry-mass spectrometry, Fourier transform infrared emission spectroscopy and cyclic voltammetry. The gel-like films prepared from aqueous solutions of the precursor salts Sn(OH) 2 (CH 3 COO) 2-x Cl x and H 2 IrCl 6 on titanium metal support were heated in an atmosphere containing 20% O 2 and 80% Ar up to 600 °C. The thermal decomposition reactions practically take place in two separate temperature ranges from ambient to about 250 °C and between 300 and 600 °C. In the low temperature range the liberation of solution components and - to a limited extent - an oxidative cracking reaction of the acetate ligand takes place catalyzed by the noble metal. In the high temperature range the evolution of chlorine as well as the decomposition of surface species formed (carbonyls, carboxylates, carbonates) can be observed. The acetate ligand shows extreme high stability and is decomposed in the 400-550 °C range, only. Since the formation and decomposition of the organic surface species can significantly influence the morphology (and thus the electrochemical properties) of the films, the complete understanding of the film evolution process is indispensable to optimize the experimental conditions of electrode preparation.

Original languageEnglish
Pages (from-to)1178-1184
Number of pages7
JournalApplied Surface Science
Volume253
Issue number3
DOIs
Publication statusPublished - Nov 30 2006

Keywords

  • Electrocatalysis
  • Iridium oxide
  • Thin films
  • Tin oxide

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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