Diffusion Characteristics in Anode-substrates for Anode-supported SOFCs
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- MATSUZAKI Yoshio
- Research Department, Tokyo Gas Co. Ltd
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- BABA Yoshitaka
- Research Department, Tokyo Gas Co. Ltd
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- SAKURAI Teruhiro
- Research Department, Tokyo Gas Co. Ltd
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<p>We have operated the single-cells in the stack structure using methane as a fuel under high fuel utilizations. Methane fuel was supplied directly to the cell-stack after addition of steam at a steam to carbon ratio of 2. A steam-reforming reaction was conducted directly on the anode (direct internal reforming: DIR). In the case of the single-cell with the anode-substrate having relatively high porosity, stack voltage was found to be 0.767 V at fuel utilization of 75%, at which d.c. energy conversion efficiency is 50.2% (H HV). A maximum energy conversion efficiency, 53.6%, was achieved at fuel utilization of 86% and cell voltage of 0.712 V. This methane-to-electricity conversion efficiency will be high enough for practical applications. For anode-supported SOFCs, concentration polarization loss in the anode can be a crucial problem because fresh fuel and electrochemical reaction products have to diffuse through a thick anode substrate in the opposite direction between the flow field (fuel distribution channel) and the anode/ electrolyte interface. Limiting current density with a diluted CO at a fixed current density was measured and analyzed to investigate the diffusion characteristics of a fuel in the anode-substrates. Diffusion parameters obtained by the analysis were verified by measurement of the limiting current density with diluted H2 and voltage response for depolarization process after current-interruption.</p>
収録刊行物
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- Electrochemistry
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Electrochemistry 73 (7), 484-488, 2005-07-05
公益社団法人 電気化学会
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詳細情報 詳細情報について
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- CRID
- 1390001288142870784
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- NII論文ID
- 10014350738
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- NII書誌ID
- AN00151637
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- ISSN
- 21862451
- 13443542
- http://id.crossref.org/issn/13443542
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- NDL書誌ID
- 7417089
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用可