Electrochemical behavior of ceria with selected metal electrodes

William C. Chueh, Wei Lai, Sossina M. Haile*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

51 Scopus citations

Abstract

The electrochemical properties of the metal | doped ceria | metal system have been examined by A.C. impedance spectroscopy at a range of temperatures (575-650 °C) and oxygen partial pressures (8×10- 26-0.21 atm). Under reducing conditions, the inverse of the interfacial resistances for both Pt and Au electrodes on samarium-doped ceria (SDC) displayed a pO2- 1/4 dependence on oxygen partial pressure and an Arrhenius dependence on temperature with an activation energy of ~ 2.7 eV. The similarity in the characteristics of the two types of electrode materials indicates that the electrochemical oxidation of hydrogen occurs predominantly at the ceria | gas interface. Moreover, the behavior, which is similar to that of the electronic conductivity of SDC, is consistent with the hypothesis that electron migration from the reaction site to the metal current collector is the rate-limiting step.

Original languageEnglish (US)
Pages (from-to)1036-1041
Number of pages6
JournalSolid State Ionics
Volume179
Issue number21-26
DOIs
StatePublished - Sep 15 2008

Keywords

  • Ceria
  • Electrochemical oxidation
  • Electrode-electrolyte interface
  • Mixed conductors

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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