Optimization of electrochemical synthesis conditions for dense and doped ceria thin films

Kai Kamada, Naoya Enomoto, Junichi Hojo

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

In the present study, the appropriate electrolysis conditions were determined for attaining doped ceria thin films with a high density and adhesion in an aqueous solution containing of Ce3+ and Sm3+ ions. Based on a comparison of the anodic and cathodic polarizations, while the former only induced the deposition of Ce3+, the latter accomplished the simultaneous deposition of Ce and Sm species. Under an applied cathodic bias below the hydrogen evolution potential, the Ce3+ and Sm3+ were reacted with OH- ions generated by the reduction of water molecules, and then were deposited on the electrode as a hydroxide. The hydroxide was subsequently oxidized and dehydrated to form the ceria-based thin layer. The morphologies of the as-deposited films were significantly altered on the basis of the applied potential. Moreover, the addition of acetic acid to the electrolysis bath caused the production of a transparent, dense, and adherent film. The XRD pattern and Raman spectrum of the thin film revealed that the film was crystallized as the fluorite structure without any heat treatment, and Sm3+ is substituted at the Ce4+ site. Moreover, the Sm content in the film could be easily controlled by the metal concentration in the solution.

Original languageEnglish
Pages (from-to)6996-7000
Number of pages5
JournalElectrochimica Acta
Volume54
Issue number27
DOIs
Publication statusPublished - Nov 30 2009

    Fingerprint

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Electrochemistry

Cite this