Abstract
Palladium-impregnated La0.75Sr0.25Cr0.5Mn0.5O3-δ/yttria-stabilized zirconia (LSCM/YSZ) composite anode is investigated in detail for the direct utilization of methane in solid oxide fuel cells (SOFCs). Impregnation of Pd nanoparticles significantly promotes the electrocatalytic activity of LSCM/YSZ composite anodes for the methane oxidation reaction in wet CH4. At 800{degree sign}C, the electrode polarization resistance for the methane oxidation is reduced by a factor of 3 after impregnation of 0.10 - 0.66 mg cm-2 Pd. Pd impregnation primarily enhances the diffusion and dissociation associated with the electrode processes at low frequencies. No carbon deposition was observed for the reaction in wet CH4 on Pd-impregnated LSCM/YSZ composite anodes. In contrast, Pd impregnation has little effect on the hydrogen oxidation in wet H2. The results demonstrate that the Pd-impregnated LSCM/YSZ composite is a promising carbon-tolerant anode for natural gas fuel-based SOFCs.
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