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Coupled Transport Effects in Solid Oxide Fuel Cell Modeling

With its outstanding performance characteristics, the SOFC represents a promising technology for integration into the current energy supply system. For cell development and optimization, a reliable quantitative description of the transport mechanisms and the resulting losses are relevant. The local...

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Detalles Bibliográficos
Autores principales: Gedik, Aydan, Lubos, Nico, Kabelac, Stephan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8870936/
https://www.ncbi.nlm.nih.gov/pubmed/35205518
http://dx.doi.org/10.3390/e24020224
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author Gedik, Aydan
Lubos, Nico
Kabelac, Stephan
author_facet Gedik, Aydan
Lubos, Nico
Kabelac, Stephan
author_sort Gedik, Aydan
collection PubMed
description With its outstanding performance characteristics, the SOFC represents a promising technology for integration into the current energy supply system. For cell development and optimization, a reliable quantitative description of the transport mechanisms and the resulting losses are relevant. The local transport processes are calculated by a 1D model based on the non-equilibrium thermodynamics (NET). The focus of this study is the mass transport in the gas diffusion layers (GDL), which was described as simplified by Fick’s law in a previously developed model. This is first replaced by the Dusty-Gas model (DGM) and then by the thermal diffusion (Soret effect) approach. The validation of the model was performed by measuring [Formula: see text]-characteristics resulting in a maximum deviation of experimental to simulated cell voltage to up to 0.93%. It is shown that, under the prevailing temperature, gradients the Soret effect can be neglected, but the extension to the DGM has to be considered. The temperature and heat flow curves illustrate the relevance of the Peltier effects. At [Formula: see text] K and [Formula: see text] A/m(2), 64.44% of the total losses occur in the electrolyte. The exergetic efficiency for this operating point is 0.42. Since lower entropy production rates can be assumed in the GDL, the primary need is to investigate alternative electrolyte materials.
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spelling pubmed-88709362022-02-25 Coupled Transport Effects in Solid Oxide Fuel Cell Modeling Gedik, Aydan Lubos, Nico Kabelac, Stephan Entropy (Basel) Article With its outstanding performance characteristics, the SOFC represents a promising technology for integration into the current energy supply system. For cell development and optimization, a reliable quantitative description of the transport mechanisms and the resulting losses are relevant. The local transport processes are calculated by a 1D model based on the non-equilibrium thermodynamics (NET). The focus of this study is the mass transport in the gas diffusion layers (GDL), which was described as simplified by Fick’s law in a previously developed model. This is first replaced by the Dusty-Gas model (DGM) and then by the thermal diffusion (Soret effect) approach. The validation of the model was performed by measuring [Formula: see text]-characteristics resulting in a maximum deviation of experimental to simulated cell voltage to up to 0.93%. It is shown that, under the prevailing temperature, gradients the Soret effect can be neglected, but the extension to the DGM has to be considered. The temperature and heat flow curves illustrate the relevance of the Peltier effects. At [Formula: see text] K and [Formula: see text] A/m(2), 64.44% of the total losses occur in the electrolyte. The exergetic efficiency for this operating point is 0.42. Since lower entropy production rates can be assumed in the GDL, the primary need is to investigate alternative electrolyte materials. MDPI 2022-01-31 /pmc/articles/PMC8870936/ /pubmed/35205518 http://dx.doi.org/10.3390/e24020224 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Gedik, Aydan
Lubos, Nico
Kabelac, Stephan
Coupled Transport Effects in Solid Oxide Fuel Cell Modeling
title Coupled Transport Effects in Solid Oxide Fuel Cell Modeling
title_full Coupled Transport Effects in Solid Oxide Fuel Cell Modeling
title_fullStr Coupled Transport Effects in Solid Oxide Fuel Cell Modeling
title_full_unstemmed Coupled Transport Effects in Solid Oxide Fuel Cell Modeling
title_short Coupled Transport Effects in Solid Oxide Fuel Cell Modeling
title_sort coupled transport effects in solid oxide fuel cell modeling
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8870936/
https://www.ncbi.nlm.nih.gov/pubmed/35205518
http://dx.doi.org/10.3390/e24020224
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