Quantitative characterization of Cr-adsorption on CeO2, pure and doped BaCeO3 and its impact on the electrochemical performance of Ce containing complex oxides

Yushan Hou, Jianfang Wu, Elena Yu Konysheva

Research output: Journal PublicationArticlepeer-review

11 Citations (Scopus)

Abstract

Quantitative analysis of Cr-adsorption from a gas phase on CeO2, pure and doped BaCeO3 was performed in combination with surface techniques and electrochemical impedance spectroscopy. The Cr-adsorption on BaCeO3 is 3 times higher than on CeO2 and it increases by 12–25% on In doping in Ba(Ce1−xInx)O3 (x = 0.1–0.3) in the temperature range of 600–700 °C. These perovskites adsorb chromium with the formation of a multi-phase surface layer containing BaCr6+O4 and cerium oxide. Coexistence of small fractions of Cr3+ and Cr5+ cations in the surface layer was identified by X-ray photoelectron spectroscopy. The thickness of the surface layer and its morphology vary with temperature, affecting the conductivity of Ce containing perovskites below 700 °C. BaCrO4 exhibits under air noticeably larger anisotropic thermal expansion than BaCeO3. The results indicate that high tolerance to Cr-gaseous species should be considered as an important criterion for further development of materials for proton-conducting SOFCs.

Original languageEnglish
Pages (from-to)3994-4004
Number of pages11
JournalInternational Journal of Hydrogen Energy
Volume41
Issue number6
DOIs
Publication statusPublished - 2016
Externally publishedYes

Keywords

  • Acceptor doped BaCeO
  • CeO
  • Cr adsorption
  • Effect of a surface layer on conductivity
  • Proton-conducting SOFC
  • Thermal expansion of BaCrO

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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