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

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

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.

Detaljer

Författare
  • Maria Navasa
  • Christopher Graves
  • Christodoulos Chatzichristodoulou
  • Theis Løye Skafte
  • Bengt Sundén
  • Henrik Lund Frandsen
Enheter & grupper
Externa organisationer
  • Technical University of Denmark
  • Haldor Topsøe A/S
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Energiteknik

Nyckelord

Originalspråkengelska
Sidor (från-till)11913-11931
TidskriftInternational Journal of Hydrogen Energy
Volym43
Utgivningsnummer27
Tidigt onlinedatum2018 maj 18
StatusPublished - 2018 jul
PublikationskategoriForskning
Peer review utfördJa