2D thermal modeling of a solid oxide electrolyzer cell (SOEC) for syngas production by H2O/CO2co-electrolysis

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Abstract

Solid oxide fuel cells (SOFCs) can be operated in a reversed mode as electrolyzer cells for electrolysis of H2O and CO2. In this paper, a 2D thermal model is developed to study the heat/mass transfer and chemical/electrochemical reactions in a solid oxide electrolyzer cell (SOEC) for H2O/CO2co-electrolysis. The model is based on 3 sub-models: a computational fluid dynamics (CFD) model describing the fluid flow and heat/mass transfer; an electrochemical model relating the current density and operating potential; and a chemical model describing the reversible water gas shift reaction (WGSR) and reversible methanation reaction. It is found that reversible methanation and reforming reactions are not favored in H2O/CO2co-electrolysis. For comparison, the reversible WGSR can significantly influence the co-electrolysis behavior. The effects of inlet temperature and inlet gas composition on H2O/CO2co-electrolysis are simulated and discussed.
Original languageEnglish
Pages (from-to)6389-6399
Number of pages11
JournalInternational Journal of Hydrogen Energy
Volume37
Issue number8
DOIs
Publication statusPublished - 1 Apr 2012

Keywords

  • Co-electrolysis
  • Heat transfer
  • Solid oxide fuel cell
  • Synthetic fuel
  • Thermo-electrochemical model

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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