Details
| Original language | English |
|---|---|
| Article number | 014501 |
| Number of pages | 13 |
| Journal | ECS Advances |
| Volume | 3 |
| Issue number | 1 |
| Publication status | Published - 11 Jan 2024 |
Abstract
This study aims to theoretically analyze the local entropy production rate in a SOEC single cell at T = 1123.15 K and p = 1 bar. Local entropy rates signify loss mechanisms, crucial for cell design and optimization. A semi-2D SOEC model based on non-equilibrium thermodynamics is developed, supplemented by monocausal correlations for direct comparison. The model is validated using KeraCell III data and grid independence analysis. Simulations of electric current density, temperature, heat flow, and local entropy production for various SOEC operating modes are presented. Coupled transport mechanisms significance is discussed, highlighting the pronounced impact of the Peltier effect on heat flux and temperature. The importance of the Peltier effect in SOECs compared to SOFCs is emphasised. The effects of the Seebeck effect on the potential distribution are superimposed by the dominant ohmic losses in the electrolyte. The localization of entropy production rates shows for exothermic operation that 66.6% of the total losses are due to the predominantly dominant irreversible ion transport in the electrolyte, while the entanglements in the reaction layers contribute 33% and GDLs less than 1%.
Keywords
- Entropy production rate, Monocausality, Non-Equilibrium Thermodynamics, Peltier effect, Seebeck effect, Semi-2D model, Solid Oxide Electrolyzer Cell
ASJC Scopus subject areas
- Chemistry(all)
- Electrochemistry
- Energy(all)
- Energy (miscellaneous)
- Materials Science(all)
- Materials Science (miscellaneous)
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In: ECS Advances, Vol. 3, No. 1, 014501, 11.01.2024.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Comparative Analysis of Loss Mechanism Localization in a Semi-2D SOEC Single Cell Modell
T2 - Non-Equilibrium Thermodynamics versus Monocausal-Based Approach
AU - Gedik, Aydan
AU - Wachtel, Jonas
AU - Kabelac, Stephan
N1 - Publisher Copyright: © 2024 The Author(s). Published on behalf of The Electrochemical Society by IOP Publishing Limited
PY - 2024/1/11
Y1 - 2024/1/11
N2 - This study aims to theoretically analyze the local entropy production rate in a SOEC single cell at T = 1123.15 K and p = 1 bar. Local entropy rates signify loss mechanisms, crucial for cell design and optimization. A semi-2D SOEC model based on non-equilibrium thermodynamics is developed, supplemented by monocausal correlations for direct comparison. The model is validated using KeraCell III data and grid independence analysis. Simulations of electric current density, temperature, heat flow, and local entropy production for various SOEC operating modes are presented. Coupled transport mechanisms significance is discussed, highlighting the pronounced impact of the Peltier effect on heat flux and temperature. The importance of the Peltier effect in SOECs compared to SOFCs is emphasised. The effects of the Seebeck effect on the potential distribution are superimposed by the dominant ohmic losses in the electrolyte. The localization of entropy production rates shows for exothermic operation that 66.6% of the total losses are due to the predominantly dominant irreversible ion transport in the electrolyte, while the entanglements in the reaction layers contribute 33% and GDLs less than 1%.
AB - This study aims to theoretically analyze the local entropy production rate in a SOEC single cell at T = 1123.15 K and p = 1 bar. Local entropy rates signify loss mechanisms, crucial for cell design and optimization. A semi-2D SOEC model based on non-equilibrium thermodynamics is developed, supplemented by monocausal correlations for direct comparison. The model is validated using KeraCell III data and grid independence analysis. Simulations of electric current density, temperature, heat flow, and local entropy production for various SOEC operating modes are presented. Coupled transport mechanisms significance is discussed, highlighting the pronounced impact of the Peltier effect on heat flux and temperature. The importance of the Peltier effect in SOECs compared to SOFCs is emphasised. The effects of the Seebeck effect on the potential distribution are superimposed by the dominant ohmic losses in the electrolyte. The localization of entropy production rates shows for exothermic operation that 66.6% of the total losses are due to the predominantly dominant irreversible ion transport in the electrolyte, while the entanglements in the reaction layers contribute 33% and GDLs less than 1%.
KW - Entropy production rate
KW - Monocausality
KW - Non-Equilibrium Thermodynamics
KW - Peltier effect
KW - Seebeck effect
KW - Semi-2D model
KW - Solid Oxide Electrolyzer Cell
UR - http://www.scopus.com/inward/record.url?scp=85200571138&partnerID=8YFLogxK
U2 - 10.1149/2754-2734/ad1a73
DO - 10.1149/2754-2734/ad1a73
M3 - Article
AN - SCOPUS:85200571138
VL - 3
JO - ECS Advances
JF - ECS Advances
IS - 1
M1 - 014501
ER -