Direct current distribution measurement of an electrolyte-supported planar solid oxide fuel cell under the rib and channel by segmented electrodes

T. Koshiyama, Hironori Nakajima, T. Karimata, Tatsumi Kitahara, Kohei Ito, S. Masuda, Y. Ogura, J. Shimano

Research output: Chapter in Book/Report/Conference proceedingConference contribution

7 Citations (Scopus)

Abstract

In the planar SOFCs, the fuel/oxidant distributions and current collecting resistance cause current and temperature distributions over the electrodes under the separator ribs and flow channels. Optimized design of the separator is hence required to improve the output power and chemical/thermo-mechanical durabilities of practical stacks. To clarify the distributions, we prepare planar cells having three segmented cathodes. Current-voltage characteristics are measured with voltage control using three electric loads to reproduce the electrode potentials of a single cell at around 800°C. We find significantly small in-plane oxygen transport rate under the cathode rib and higher current collecting resistance under the channel. Increased anode rib width gives large overpotential under the rib due to fuel starvation. Finite element modeling supports the above experimental results. We demonstrate an improved separator design of a practical stack, taking advantage of this model. Thereby ca. 17% higher maximum power is given in the finite element simulation.

Original languageEnglish
Title of host publicationSolid Oxide Fuel Cells 14, SOFC 2015
PublisherElectrochemical Society Inc.
Pages2217-2226
Number of pages10
Volume68
Edition1
ISBN (Electronic)9781607685395
DOIs
Publication statusPublished - Jan 1 2015
Event14th International Symposium on Solid Oxide Fuel Cells, SOFC 2015; held as part of the Electrochemical Society, ECS Conference on Electrochemical Energy Conversion and Storage - Glasgow, United Kingdom
Duration: Jul 26 2015Jul 31 2015

Other

Other14th International Symposium on Solid Oxide Fuel Cells, SOFC 2015; held as part of the Electrochemical Society, ECS Conference on Electrochemical Energy Conversion and Storage
CountryUnited Kingdom
CityGlasgow
Period7/26/157/31/15

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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    Koshiyama, T., Nakajima, H., Karimata, T., Kitahara, T., Ito, K., Masuda, S., Ogura, Y., & Shimano, J. (2015). Direct current distribution measurement of an electrolyte-supported planar solid oxide fuel cell under the rib and channel by segmented electrodes. In Solid Oxide Fuel Cells 14, SOFC 2015 (1 ed., Vol. 68, pp. 2217-2226). Electrochemical Society Inc.. https://doi.org/10.1149/06801.2217ecst