Abstract
This paper describes results on direct-methane solid oxide fuel cell (air, LSM-YSZ|YSZ|Ni-YSZ, CH 4) operation for combined electricity and syngas production. Thermodynamic equilibrium predictions showed that efficient methane conversion to syngas is expected for SOFC operating temperature >700 °C and O 2−/CH 4 ratios of ≈1. A simple thermal analysis was used to determine conditions where the cell produces enough heat to self-sustain its operating temperature; relatively low cell voltage and O 2−/CH 4 ratios > 1 were found to be useful. Fuel cells operated at T ≈ 750 °C, V ≈ 0.4 V, and O 2−/CH 4 ≈ 1.2 yielded electrical power output of ∼0.7 W cm −2 and syngas production rates of ∼20 sccm cm −2. Stable cell operation without coking for >300 h was achieved.
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