Transient and permanent effects of direct current on oxygen transfer across YSZ-electrode interfaces

Seetharaman Sridhar, Victor Stancovski, Uday B. Pal

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

The impedance response of a Pt/YSZ (yttria-stabilized zirconia) interface at 900°C is modified by the passage of direct currents. The initial steady-state impedance spectra are different from those taken after current interruption. The latter evolve toward a new steady state. The magnitude and equilibration kinetics of this effect are complex functions of the direction and magnitude of the applied current and the history of gas exposure. An equivalent circuit that models the evolving changes in the impedance spectra is proposed. The analysis of the effect may provide an insight into the mechanism of the anodic and cathodic interfacial reactions in a solid oxide fuel cell.

Original languageEnglish (US)
Pages (from-to)2479-2485
Number of pages7
JournalJournal of the Electrochemical Society
Volume144
Issue number7
DOIs
StatePublished - Jul 1997
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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