Exchange current density of SOFC electrodes: Theoretical relations and partial pressure dependencies rate-determined by electrochemical reactions

T. Hosoi, T. Yonekura, K. Sunada, Kazunari Sasaki

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

As a theoretical consideration on electrode defect chemistry, general relations of exchange current density quantitatively representing Solid Oxide Fuel Cell (SOFC) electrode performance are systematically derived as a function of gas partial pressures, equilibrium constants of adsorption and dissociation reactions on electrode surfaces, and electrochemical reaction rate constants for possible elemental reactions at the cathode and the anode, in the case that an electrochemical reaction is the rate-determining electrode reaction. Simplified expressions are also derived, under the condition that one kind of neutral or charged adsorbed species is predominant at the electrode, to derive gas partial pressure dependence of exchange current density for given rate-determining electrochemical reactions. Importance of considering elementary steps is highlighted to derive rate equations and to clarify various dependencies. Partial pressure dependencies of the exchange current density are compiled and discussed by simulating normalized exchange current density values for given partial pressures. The applicability and limitation of the Butler-Volmer type expressions of exchange current density for SOFC electrodes are carefully discussed.

Original languageEnglish
Pages (from-to)F136-F152
JournalJournal of the Electrochemical Society
Volume162
Issue number1
DOIs
Publication statusPublished - Jan 1 2015

Fingerprint

solid oxide fuel cells
Solid oxide fuel cells (SOFC)
Partial pressure
partial pressure
Current density
current density
Electrodes
electrodes
gas pressure
Gases
Equilibrium constants
pressure dependence
Reaction rates
Rate constants
Anodes
reaction kinetics
Cathodes
anodes
cathodes
dissociation

All Science Journal Classification (ASJC) codes

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

Cite this

Exchange current density of SOFC electrodes : Theoretical relations and partial pressure dependencies rate-determined by electrochemical reactions. / Hosoi, T.; Yonekura, T.; Sunada, K.; Sasaki, Kazunari.

In: Journal of the Electrochemical Society, Vol. 162, No. 1, 01.01.2015, p. F136-F152.

Research output: Contribution to journalArticle

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