Abstract
Performance and chemical stability of a composite LSFCO/CGO anode were investigated for direct electrochemical oxidation of methane in intermediate temperature solid oxide fuel cells (IT-SOFCS) and compared with cermet-based catalysts. A maximum power density approaching 0.2 W cm -2 was recorded at 800°C in dry methane for the perovskite anode. Although, this performance is lower than that achieved with Ni based cermets, e.g. NiCu-CGO, the anode did not show any presence of carbon deposits and no significant degradation was observed after prolonged cell operation in methane. Alternatively, this perovskite material gave rise to significant chemical and structure modifications upon exposure to dry methane in a packed-bed reactor. It is derived that the continuous supply of mobile oxygen anions from the electrolyte to the LSFCO anode, promoted by the mixed conductivity of CGO electrolyte at 800°C, stabilizes the perovskite structure near the surface under SOFC operation and OCV conditions.
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