Pyrolytic Carbon Deposition on Porous Cathode Tubes and Its Use as an Interlayer for Solid Oxide Fuel Cell Zirconia Electrolyte Fabrication

Rajendra N. Basu, Orhan Altin, Merrilea J. Mayo, Clive A. Randall, Semih Eser

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

A high-quality fugitive pyrolytic carbon (PyC) film is used as an interlayer material in fabricating solid oxide fuel cells (SOFCs) by electrophoretic deposition (EPD). The carbon must both be highly conducting and burn away cleanly; hence, a graphitic or pyrolytic carbon is required. In this investigation, optimum conditions for PyC deposition from propylene pyrolysis (i.e., CVD) were ascertained. Propylene was decomposed at temperatures of 725, 775, and 825°C and at 1 atm pressure with different residence times (10-20 s) onto a porous LaMnO3 tube surface. Depending on the temperature and residence time, two different ranges of carbon deposit reactivities were obtained, corresponding to disordered and ordered carbon states, respectively. Temperature-programmed oxidation, scanning electron microscopy, and micro-Raman spectroscopy analyses indicate that the creation of uniform and sufficiently thick films with the highest degree of atomic ordering occurs at temperatures between 725 and 775°C and a gas residence of about 14 s. Notably, the same carbon deposition conditions produced crack-free and gastight YSZ films (15-20 μm) during the fabrication of SOFCs by EPD and subsequent sintering.

Original languageEnglish (US)
JournalJournal of the Electrochemical Society
Volume148
Issue number5
DOIs
StatePublished - May 1 2001

Fingerprint

tube cathodes
solid oxide fuel cells
Solid oxide fuel cells (SOFC)
zirconium oxides
Zirconia
Electrolytes
interlayers
Cathodes
Carbon
electrolytes
Fabrication
fabrication
carbon
Temperature
Propylene
propylene
Carbon films
Thick films
Raman spectroscopy
Chemical vapor deposition

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

Cite this

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title = "Pyrolytic Carbon Deposition on Porous Cathode Tubes and Its Use as an Interlayer for Solid Oxide Fuel Cell Zirconia Electrolyte Fabrication",
abstract = "A high-quality fugitive pyrolytic carbon (PyC) film is used as an interlayer material in fabricating solid oxide fuel cells (SOFCs) by electrophoretic deposition (EPD). The carbon must both be highly conducting and burn away cleanly; hence, a graphitic or pyrolytic carbon is required. In this investigation, optimum conditions for PyC deposition from propylene pyrolysis (i.e., CVD) were ascertained. Propylene was decomposed at temperatures of 725, 775, and 825°C and at 1 atm pressure with different residence times (10-20 s) onto a porous LaMnO3 tube surface. Depending on the temperature and residence time, two different ranges of carbon deposit reactivities were obtained, corresponding to disordered and ordered carbon states, respectively. Temperature-programmed oxidation, scanning electron microscopy, and micro-Raman spectroscopy analyses indicate that the creation of uniform and sufficiently thick films with the highest degree of atomic ordering occurs at temperatures between 725 and 775°C and a gas residence of about 14 s. Notably, the same carbon deposition conditions produced crack-free and gastight YSZ films (15-20 μm) during the fabrication of SOFCs by EPD and subsequent sintering.",
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Pyrolytic Carbon Deposition on Porous Cathode Tubes and Its Use as an Interlayer for Solid Oxide Fuel Cell Zirconia Electrolyte Fabrication. / Basu, Rajendra N.; Altin, Orhan; Mayo, Merrilea J.; Randall, Clive A.; Eser, Semih.

In: Journal of the Electrochemical Society, Vol. 148, No. 5, 01.05.2001.

Research output: Contribution to journalArticle

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