Carbon deposition on a SOFC anode was investigated under direct hydrocarbon fueling condition. Microscopic behaviors were observed with a newly designed sample holder that enabled in-situ observation of an electrode in operation under controlled atmosphere at elevated temperatures. The preferential carbon deposition site, the structure of the deposited carbon, and the chemical or electrochemical re-oxidation processes were investigated with an optical microscope combined with a laser Raman microscope. Color and morphology change of the electrode surface was recorded with a CCD camera, and the deposited materials were identified with a laser Raman microscope. A nickel micro grid was used as a model electrode of a well-defined microstructure. When the cell was kept at an open circuit condition in methane, carbon started to deposit on the surface of Ni grid electrode. The deposition of carbon was clearly observed as the change in the reflection on the nickel surface by optical microscope as well as by the appearance of the specific peak at ∼ 1560 cm−1 in Raman spectroscopy. The deposited carbon was in the form of graphite on the nickel grid electrode. The carbon coverage on the surface was not uniform but varied from grain to grain. When a certain anodic overpotential (e.g. 200 mV) was applied to the electrode, the carbon disappeared gradually from the edge of the electrode i.e. from the electrode/electrolyte boundary where oxygen was supplied electrochemically. It is the first in-situ observation of the electrochemical carbon oxidation in a real operation condition.
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ASME 2004 2nd International Conference on Fuel Cell Science, Engineering and Technology
June 14–16, 2004
Rochester, New York, USA
Conference Sponsors:
- Nanotechnology Institute
ISBN:
0-7918-4165-0
PROCEEDINGS PAPER
Microscopic Observations of SOFC Anodes Under Operation With Hydrocarbon Fuels Available to Purchase
Tatsuya Kawada,
Tatsuya Kawada
Tohoku University, Sendai, Miyagi, Japan
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Keiji Yashiro,
Keiji Yashiro
Tohoku University, Sendai, Miyagi, Japan
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Tomoaki Taura,
Tomoaki Taura
Tohoku University, Sendai, Miyagi, Japan
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Kenichiro Takeda,
Kenichiro Takeda
Tohoku University, Sendai, Miyagi, Japan
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Atsushi Kaimai,
Atsushi Kaimai
Tohoku University, Sendai, Miyagi, Japan
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Hiroshige Matsumoto,
Hiroshige Matsumoto
Tohoku University, Sendai, Miyagi, Japan
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Junichiro Mizusaki,
Junichiro Mizusaki
Tohoku University, Sendai, Miyagi, Japan
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H. Yugami
H. Yugami
Tohoku University, Sendai, Miyagi, Japan
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Tatsuya Kawada
Tohoku University, Sendai, Miyagi, Japan
Keiji Yashiro
Tohoku University, Sendai, Miyagi, Japan
Tomoaki Taura
Tohoku University, Sendai, Miyagi, Japan
Kenichiro Takeda
Tohoku University, Sendai, Miyagi, Japan
Atsushi Kaimai
Tohoku University, Sendai, Miyagi, Japan
Hiroshige Matsumoto
Tohoku University, Sendai, Miyagi, Japan
Junichiro Mizusaki
Tohoku University, Sendai, Miyagi, Japan
H. Yugami
Tohoku University, Sendai, Miyagi, Japan
Paper No:
FUELCELL2004-2452, pp. 53-59; 7 pages
Published Online:
November 17, 2008
Citation
Kawada, T, Yashiro, K, Taura, T, Takeda, K, Kaimai, A, Matsumoto, H, Mizusaki, J, & Yugami, H. "Microscopic Observations of SOFC Anodes Under Operation With Hydrocarbon Fuels." Proceedings of the ASME 2004 2nd International Conference on Fuel Cell Science, Engineering and Technology. 2nd International Conference on Fuel Cell Science, Engineering and Technology. Rochester, New York, USA. June 14–16, 2004. pp. 53-59. ASME. https://doi.org/10.1115/FUELCELL2004-2452
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