A three dimensional multiphysics model of a solid oxide electrochemical cell: A tool for understanding degradation

Research output: Contribution to journalArticle

Abstract

Mitigating degradation is essential for extending the lifetime of solid oxide electrochemical cells (SOCs). The conditions leading to degradation, e.g. overpotentials, gas partial pressures, thermal gradients are hard, if not impossible, to retrieve experimentally. Thus, to deconvolute the response from cell testing, modeling can be applied to understand the degradation phenomena in greater detail. Modeling of SOCs is well developed. For computational efficiency, the electrodes are often represented with a mathematical abstraction of zero thickness layer. In this work, further attention is given to the local conditions in the through-thickness of the electrodes, by rigidly integrating classical electrochemistry into a three dimensional multiphysics model of an SOC. Hereby, local conditions (e.g. overpotential) vary through the electrode, and with the coupling to the different transport phenomena occurring (mass, current, momentum and species), this becomes available in three dimensions, throughout a cell. To investigate the validity of the model, a high number of experiments are conducted at different operating conditions, i.e. in both fuel cell and electrolysis mode of operation with H2/H2O as feedstock varying parameters such as temperature, gas flows and gas compositions.

Details

Authors
  • Maria Navasa
  • Christopher Graves
  • Christodoulos Chatzichristodoulou
  • Theis Løye Skafte
  • Bengt Sundén
  • Henrik Lund Frandsen
Organisations
External organisations
  • Technical University of Denmark
  • Haldor Topsøe A/S
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Energy Engineering

Keywords

  • Degradation, Modeling, Potential profiles, Solid oxide electrochemical cells, Transport phenomena
Original languageEnglish
Pages (from-to)11913-11931
JournalInternational Journal of Hydrogen Energy
Volume43
Issue number27
Early online date2018 May 18
Publication statusPublished - 2018 Jul
Publication categoryResearch
Peer-reviewedYes