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Combustion Characterization and Model Fuel Development for Micro-tubular Flame-assisted Fuel Cells

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Coupled Transport Effects in Solid Oxide Fuel Cell Modeling.

Aydan Gedik¹, Nico Lubos¹, Stephan Kabelac¹

¹Institute of Thermodynamics, Leibniz University Hannover, Welfengarten 1, D-30167 Hannover, Germany.

Entropy (Basel, Switzerland)

|February 25, 2022

Summary

This summary is machine-generated.

This study enhances solid oxide fuel cell (SOFC) models by incorporating advanced mass transport descriptions in gas diffusion layers (GDL). The improved model accurately predicts SOFC performance, highlighting electrolyte losses and guiding future material development.

Keywords:

Dusty-Gas model (DGM)Soret effect entropy production exergy efficiency non-equilibrium thermodynamics (NET)solid oxide fuel cell (SOFC)thermal diffusion

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Area of Science:

Electrochemistry
Materials Science
Chemical Engineering

Background:

Solid oxide fuel cells (SOFCs) show promise for energy systems.
Accurate modeling of transport mechanisms and losses is crucial for SOFC development.
Previous models simplified mass transport in gas diffusion layers (GDL).

Purpose of the Study:

To improve the quantitative description of mass transport in SOFC GDLs.
To replace Fick's law with more sophisticated models like the Dusty-Gas model (DGM) and thermal diffusion.
To validate the enhanced model against experimental data.

Main Methods:

Development of a 1D model based on non-equilibrium thermodynamics (NET).
Implementation of the Dusty-Gas model (DGM) and thermal diffusion (Soret effect) for GDL mass transport.
Validation using measured U,j-characteristics of SOFCs.

Main Results:

The enhanced model shows a maximum deviation of 0.93% from experimental cell voltage.
The Soret effect is negligible under prevailing conditions, but DGM is necessary.
Peltier effects significantly influence temperature and heat flow.
At 1123.15 K and 8000 A/m², 64.44% of losses occur in the electrolyte, with exergetic efficiency at 0.42.

Conclusions:

The DGM provides a necessary improvement for modeling GDL mass transport in SOFCs.
The Soret effect is not significant for the studied conditions.
Electrolyte losses are substantial, indicating a need for alternative electrolyte materials with lower entropy production.