Degradation of solid oxide fuel cell anodes due to sintering of metal particles. Correlated percolation model
- Rheinisch-Westfaelische Technische Hochschule, Aachen (Germany). Inst. fuer Theoretische Physik
- Forschungszentrum Juelich GmbH (Germany). Inst. fuer Energieverfahrenstechnik
Variation with time of the chemically three-phase boundary, due to the spontaneous sintering of metal particles, is simulated with the help of a correlated percolation model. Different modes of variation are obtained depending on the relative composition and porosity and the conditions of sintering. They range from a moderate degradation (when the three-phase boundary still penetrates through the whole volume of the anode) to a catastrophic degradation (when the three-phase boundary is localized within a thin layer near the current collector). More specific situations, including non-monotonic variation, are also revealed, as well as a rare case where the three-phase boundary increases when the sintering leads to the opening of new pores. Optimization of composition for a stable anode performance is discussed.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 556820
- Journal Information:
- Journal of the Electrochemical Society, Vol. 144, Issue 9; Other Information: PBD: Sep 1997
- Country of Publication:
- United States
- Language:
- English
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