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 -