Direct Utilization of Methanol and Ethanol on La_(0.75)Sr_(0.25)Cr_(0.5)Mn_(0.5)O_(3-δ) Anodes for Solid Oxide Fuel Cells

摘要

The direct utilization of methanol and ethanol was tested in La_(0.75)Si_(0.25)Ci_(0.5)n_(0.5)O_(3-δ) (LSCM) anodes to verify stability and to determine whether this material can inhibit carbon formation. The catalytic decomposition of the alcohols was tested ex situ, while performance and stability were tested in situ at 800 °C. Ex situ results indicate that in methanol LSCM rapidly loses its catalytic activity for the decomposition reaction, while in ethanol pyrolytic reactions are dominant. LSCM does not inhibit carbon formation with both alcohol fuels. In situ cell performance is modest both in hydrogen and alcohols fuels. Performance degradation is observed after exposure to the alcohols, but coking does not permanently damage the electrode structure. Increased conductivities as well as optimization of the electrode microstructures are required to improve the performance of these anodes.