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 language | English |
|---|---|
| Pages (from-to) | 6389-6399 |
| Number of pages | 11 |
| Journal | International Journal of Hydrogen Energy |
| Volume | 37 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - 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
