### 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 language | English |
---|---|

Pages (from-to) | F136-F152 |

Journal | Journal of the Electrochemical Society |

Volume | 162 |

Issue number | 1 |

DOIs | |

Publication status | Published - Jan 1 2015 |

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### 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

*Journal of the Electrochemical Society*,

*162*(1), F136-F152. https://doi.org/10.1149/2.0561501jes

**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.

Research output: Contribution to journal › Article

*Journal of the Electrochemical Society*, vol. 162, no. 1, pp. F136-F152. https://doi.org/10.1149/2.0561501jes

}

TY - JOUR

T1 - Exchange current density of SOFC electrodes

T2 - Theoretical relations and partial pressure dependencies rate-determined by electrochemical reactions

AU - Hosoi, T.

AU - Yonekura, T.

AU - Sunada, K.

AU - Sasaki, Kazunari

PY - 2015/1/1

Y1 - 2015/1/1

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=84923325513&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84923325513&partnerID=8YFLogxK

U2 - 10.1149/2.0561501jes

DO - 10.1149/2.0561501jes

M3 - Article

AN - SCOPUS:84923325513

VL - 162

SP - F136-F152

JO - Journal of the Electrochemical Society

JF - Journal of the Electrochemical Society

SN - 0013-4651

IS - 1

ER -