Fabrication and performance of membrane solid oxide fuel cells with La_(0.75)Sr_(0.25)Cr_(0.5)Mn_(0.5)O_(3-δ) impregnated anodes

摘要

La_(0.75)Sr_(0.25)Cr_(0.5)Mn_(0.5)O_(3-δ) (LSCrM)-impregnated anodes have been fabricated by infiltrating 70% porous yttria-stabilized zirconia (YSZ) matrixes with an LSCrM solution. In these anodes, LSCrM is a primary electronic conducive phase while the well-sintered YSZ provides an ionic-conducting pathway throughout the electrode. The maximum power densities of a single cell with YSZ+35 wt.% LSCrM composite anode reach 567 and 561 mW cm~(-2) at 850℃ in dry H_2 and CH_4, respectively. Further, Ag and Ni are added via nitrate impregnating method for improving electronic conductivity and catalytic activity. With the addition of 6 wt.% Ni and 2 wt.% Ag to the YSZ + 32 wt.% LSCrM composite anode, the maximum power densities at 850℃ increase to 1302 mW cm~(-2) in dry H_2 and 769 mW cm~(-2) in dry CH_4. No carbon deposition is detected in the tested anodes, even with the presence of Ni.