Electrochemical behavior of ceria with selected metal electrodes

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

Research output: Research - peer-reviewArticle

  • 44 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.

LanguageEnglish (US)
Pages1036-1041
Number of pages6
JournalSolid State Ionics
Volume179
Issue number21-26
DOIs
StatePublished - Sep 15 2008
Externally publishedYes

Profile

electrodes
metals
Cerium compounds
Metals
Electrodes
samarium
partial pressure
oxygen
temperature
Samarium
Partial pressure
Oxygen
Temperature
electrochemical oxidation
electrode materials
accumulators
alternating current
impedance
activation energy
conductivity

Keywords

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

ASJC Scopus subject areas

  • Electrochemistry
  • Physical and Theoretical Chemistry
  • Energy Engineering and Power Technology
  • Materials Chemistry
  • Condensed Matter Physics

Cite this

Electrochemical behavior of ceria with selected metal electrodes. / Chueh, William C.; Lai, Wei; Haile, Sossina M.

In: Solid State Ionics, Vol. 179, No. 21-26, 15.09.2008, p. 1036-1041.

Research output: Research - peer-reviewArticle

Chueh WC, Lai W, Haile SM. Electrochemical behavior of ceria with selected metal electrodes. Solid State Ionics. 2008 Sep 15;179(21-26):1036-1041. Available from, DOI: 10.1016/j.ssi.2007.12.087
Chueh, William C. ; Lai, Wei ; Haile, Sossina M./ Electrochemical behavior of ceria with selected metal electrodes. In: Solid State Ionics. 2008 ; Vol. 179, No. 21-26. pp. 1036-1041
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