Gas transport in hydrogen electrode of solid oxide regenerative fuel cells for power generation and hydrogen production

Title
Gas transport in hydrogen electrode of solid oxide regenerative fuel cells for power generation and hydrogen production
Authors
윤경중이성일안혁순김정희손지원이종호제해준이해원김병국
Keywords
Solid oxide regenerative fuel cell; Solid oxide fuel cell; Solid oxide electrolysis cell; Gas diffusion; Concentration polarization
Issue Date
2014-03
Publisher
International journal of hydrogen energy
Citation
VOL 39, NO 8, 3868-3878
Abstract
To further develop solid oxide regenerative fuel cell (SORFC) technology, the effect of gas diffusion in the hydrogen electrode on the performance of solid oxide fuel cells (SOFCs) and solid oxide electrolysis cells (SOECs) is investigated. The hydrogen electrode-supported cells are fabricated and tested under various operating conditions in both the power generation and hydrogen production modes. A transport model based on the dusty-gas model is developed to analyze the multi-component diffusion process in the porous media, and the transport parameters are obtained by applying the experimentally measured limiting current data to the model. The structural parameters of the porous electrode, such as porosity and tortuosity, are derived using the ChapmaneEnskogg model and microstructural image analysis. The performance of an SOEC is strongly influenced by the gas diffusion limitation at the hydrogen electrode, and the limiting current density of an SOEC is substantially lower than that of an SOFC for the standard cell structure under normal operating conditions. The pore structure of the hydrogen electrode is optimized by using poly(methyl methacrylate) (PMMA), a pore-forming agent, and consequently, the hydrogen production rate of the SOEC is improved by a factor of greater than two under moderate humidity conditions.
URI
http://pubs.kist.re.kr/handle/201004/47273
ISSN
03603199
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KIST Publication > Article
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