Abstract
AbstractFour cathode materials for single chamber solid oxide fuel cell (SC‐SOFC) [La0.8Sr0.2MnO3–δ (LSM), Ba0.5Sr0.5Co0.8Fe0.2O3–δ (BSCF), Sm0.5Sr0.5CoO3–δ (SSC), and La0.6Sr0.4Co0.2Fe0.8O3–δ (LSCF)] were investigated regarding their chemical stability, electrical conductivity, catalytic activity, and polarization resistance under air and methane/air atmosphere. Electrolyte‐supported fuel cells, with Ce0.9Gd0.1O2–δ (CGO) electrolyte and a Ni‐CGO anode, were tested in several methane/air mixtures with each cathode materials between 625 and 725 °C. These single cells were not optimized but only designed to compare the four studied cathodes. The decrease of methane‐to‐oxygen ratio from 2 to 0.67 strongly increased the performance of fuel cells for all cathode materials but the effect of temperature was not always significant. Cells with SSC, BSCF, and LSCF have shown a maximum power density about 20 mW cm–2 while the cell with LSM has given only 5 mW cm–2.
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