Abstract
A problem associated with the direct oxidation of hydrocarbon fuels such as methane in a solid oxide fuel cell (SOFC) has been the rapid deactivation of the anode as a result of carbon deposition. However, the use of doped-ceria in the SOFC anode can potentially overcome this problem. A micro-tubular SOFC using strontium- and magnesium doped lanthanum gallate (LSGM) of composition La 0.8 Sr 0.2 Ga 0.8 Mg 0.2 O 2.8 as the electrolyte was developed and tested using a doped-ceria based anode and a cathode material of La 0.6 Sr 0.4 CoO 3 . A power density of 307 mW/cm 2 was achieved for a methaneloxygen fuel corresponding to a current density of 614 mA/cm 2 at 900°C. The procedures involved in the extrusion of micro-tubular lanthanum gallate (LaGaO 3 ) electrolyte tubes are also discussed in this paper. This study shows that achieving a commercial SOFC which could be operated at intermediate temperatures (650-800°C) and that could avoid the direct use of hydrogen as the fuel, is not an impractical task in the near future.
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