Three-dimensional random resistor-network model for solid oxide fuel cell composite electrodes

Ali Abbaspour, Jing Li Luo*, K. Nandakumar

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

A three-dimensional reconstruction of solid oxide fuel cell (SOFC) composite electrodes was developed to evaluate the performance and further investigate the effect of microstructure on the performance of SOFC electrodes. Porosity of the electrode is controlled by adding pore former particles (spheres) to the electrode and ignoring them in analysis step. To enhance connectivity between particles and increase the length of triple-phase boundary (TPB), sintering process is mimicked by enlarging particles to certain degree after settling them inside the packing. Geometrical characteristics such as length of TBP and active contact area as well as porosity can easily be calculated using the current model. Electrochemical process is simulated using resistor-network model and complete Butler-Volmer equation is used to deal with charge transfer process on TBP. The model shows that TPBs are not uniformly distributed across the electrode and location of TPBs as well as amount of electrochemical reaction is not uniform. Effects of electrode thickness, particle size ratio, electron and ion conductor conductivities and rate of electrochemical reaction on overall electrochemical performance of electrode are investigated.

Original languageEnglish
Pages (from-to)3944-3950
Number of pages7
JournalElectrochimica Acta
Volume55
Issue number12
DOIs
StatePublished - 30 Apr 2010
Externally publishedYes

Keywords

  • Composite electrode
  • Modeling
  • Resistor network
  • Triple-phase boundary

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