Abstract
Sr 2− x La x MnO 4+ δ ( x = 0.4, 0.5, 0.6) oxides were studied as the cathode material for solid oxide fuel cells (SOFC). The reactivity tests indicated that no reaction occurred between Sr 2− x La x MnO 4+ δ and CGO at annealing temperature of 1000 °C, and the electrode formed good contact with the electrolyte after being sintered at 1000 °C for 4 h. The total electrical conductivity, which has strong effect on the electrode properties, was determined in a temperature range from 100 to 800 °C. The maximum value of 5.7 S cm −1 was found for the x = 0.6 phase at 800 °C in air. The cathode polarization and AC impedance results showed that Sr 1.4La 0.6MnO 4+ δ exhibited the lowest cathode overpotential. The area specific resistance (ASR) was 0.39 Ω cm 2 at 800 °C in air. The charge transfer process is the rate-limiting step for oxygen reduction reaction on Sr 1.4La 0.6MnO 4+ δ electrode.
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