Study on the Pore-formers for Porous Anode Substrates of Solid Oxide Fuel Cell

Abstract:

La0.7Sr0.3Cr0.5Mn0.5O3-δ (LSCM) ultrafine powder was synthesized using glycine-nitrate process. Three kinds of pore-formers(activated carbon, starch and graphite) with different ratios were mixed with the LSCM powders to prepare porous anode substrates. The porosity of the anode substrate was measured by the Archimedes method, and the maximum porosity was 45%. The morphology and the structure of the anode substrates were characterized by SEM, XRD and EDS. XRD analysis displays that the LSCM substrates are main perovskite phases after sintering. SEM analyses show that the pore distribution of the anode substrate prepared by adding 20 wt% activated carbon is more uniform than those of the substrates prepared by starch and graphite, and no cracks appear. The catalytic experiments results demonstrate that the porous anode substrate prepared by adding 20 wt% activated carbon as the pore-former has the best methane catalytic performance at high temperature, and the corresponding conversion efficiency is 71.88%.