Microscopic observation of SOFC anodes under operation with hydrocarbon fuels

Tatsuya Kawada, Keiji Yashiro, Tomoaki Taura, Kenichiro Takeda, Atsushi Kaimai, Hiroshige Matsumoto, Junichiro Mizusaki, H. Yugami

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

4 Citations (Scopus)

Abstract

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.

Original languageEnglish
Title of host publicationFuel Cell Science, Engineering and Technology - 2004
EditorsR.K. Shah, S.G. Kandlikar
Pages53-59
Number of pages7
Publication statusPublished - Sep 13 2004
EventSecond International Conference on Fuel Cell Science, Engineering and Technology - Rochester, NY, United States
Duration: Jun 14 2004Jun 16 2004

Publication series

NameFuel Cell Science, Engineering and Technology - 2004

Other

OtherSecond International Conference on Fuel Cell Science, Engineering and Technology
CountryUnited States
CityRochester, NY
Period6/14/046/16/04

Fingerprint

Solid oxide fuel cells (SOFC)
Anodes
Hydrocarbons
Carbon
Electrodes
Microscopes
Nickel
Oxidation
Fueling
Lasers
CCD cameras
Raman spectroscopy
Methane
Graphite
Deposits
Electrolytes
Protective atmospheres
Color
Microstructure
Oxygen

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Kawada, T., Yashiro, K., Taura, T., Takeda, K., Kaimai, A., Matsumoto, H., ... Yugami, H. (2004). Microscopic observation of SOFC anodes under operation with hydrocarbon fuels. In R. K. Shah, & S. G. Kandlikar (Eds.), Fuel Cell Science, Engineering and Technology - 2004 (pp. 53-59). (Fuel Cell Science, Engineering and Technology - 2004).

Microscopic observation of SOFC anodes under operation with hydrocarbon fuels. / Kawada, Tatsuya; Yashiro, Keiji; Taura, Tomoaki; Takeda, Kenichiro; Kaimai, Atsushi; Matsumoto, Hiroshige; Mizusaki, Junichiro; Yugami, H.

Fuel Cell Science, Engineering and Technology - 2004. ed. / R.K. Shah; S.G. Kandlikar. 2004. p. 53-59 (Fuel Cell Science, Engineering and Technology - 2004).

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

Kawada, T, Yashiro, K, Taura, T, Takeda, K, Kaimai, A, Matsumoto, H, Mizusaki, J & Yugami, H 2004, Microscopic observation of SOFC anodes under operation with hydrocarbon fuels. in RK Shah & SG Kandlikar (eds), Fuel Cell Science, Engineering and Technology - 2004. Fuel Cell Science, Engineering and Technology - 2004, pp. 53-59, Second International Conference on Fuel Cell Science, Engineering and Technology, Rochester, NY, United States, 6/14/04.
Kawada T, Yashiro K, Taura T, Takeda K, Kaimai A, Matsumoto H et al. Microscopic observation of SOFC anodes under operation with hydrocarbon fuels. In Shah RK, Kandlikar SG, editors, Fuel Cell Science, Engineering and Technology - 2004. 2004. p. 53-59. (Fuel Cell Science, Engineering and Technology - 2004).
Kawada, Tatsuya ; Yashiro, Keiji ; Taura, Tomoaki ; Takeda, Kenichiro ; Kaimai, Atsushi ; Matsumoto, Hiroshige ; Mizusaki, Junichiro ; Yugami, H. / Microscopic observation of SOFC anodes under operation with hydrocarbon fuels. Fuel Cell Science, Engineering and Technology - 2004. editor / R.K. Shah ; S.G. Kandlikar. 2004. pp. 53-59 (Fuel Cell Science, Engineering and Technology - 2004).
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