Abstract
The electrochemical oxidative dimerization of methane to give C 2 hydrocarbon species was investigated in solid oxide fuel cells (SOFCs) possessing the general configuration: CH 4, (anode) electrocatalyst/ZrO 2(8m/oY 2O 3)/La 0.9Sr 0.1MnO 3, O 2(air). Perovskite anode electrocatalysts shown to possess activity towards promoting the subject reaction included Sm 0.5Ce 0.5CuO 3, Tb 0.8Sm 0.2CuO 3, Gd 0.9Th 0.1CuO 3, Gd 0.9Na 0.1MnO 3 and Th 0.8Yb 0.2NiO 3. An inverse linear dependence was found for methane conversion to C 2 species on both perovskite electrocatalyst molecular volumes and their lattice-ionic free volumes. These observations suggested that anode electrocatalyst activity towards promoting C 2 synthesis may be either dependent upon lattice spacings or on their intrinsic ionic transport properties, both of which might be expected to be related to the lattice metal-oxygen bonding energy. The maximum partial Faradaic current densities at copper based perovskite were found to exhibit a linear dependence to the experimentally determined magnetic moments, consistent with an increasing population of Cu 3+ sites, favoring stabilization of reactive surface O - species.
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