Abstract
The electrocatalytic activity of composite anodes, consisting of micron-scale sized Pt particles and nanocrystalline Ce 0.8Gd 0.2O 2-δ(CGO) prepared by the cellulose-precursor technique, was evaluated for the oxidation of dry methane in a solid oxide fuel cell (SOFC) with zirconia-based electrolyte at 1173 K. Increasing current density above 100 mA/cm 2 and the corresponding decrease of CH 4/O 2 ratio down to 2–3 suppressed carbon formation, but decreased CO/CO 2 molar ratio in the product mixture to 0.3–0.9. The methane conversion rate was found to increase linearly with current, suggesting an increasing role of total CH 4 oxidation by oxygen electrochemically supplied onto the anode surface. The results show that, although ceria-based anode components are well known to improve SOFC performance, their presence leads to high CO 2 selectivity and thus seems inappropriate for the generation of synthesis gas in SOFC-type reactors.
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