Development of LSM/YSZ composite cathode for anode-supported solid oxide fuel cells

Leng, Y. J.; Chan, S. H.; Khor, K. A.; Jiang, S. P.
April 2004
Journal of Applied Electrochemistry;Apr2004, Vol. 34 Issue 4, p409
Academic Journal
This paper presents the effect of (La,Sr)MnO3 (LSM) stoichiometry on the polarization behaviour of LSM/Y2O3-ZrO2 (YSZ) composite cathodes. The composite cathode made of A-site deficient (La0.85Sr0.15)0.9MnO3 (LSM-B) showed much lower electrode interfacial resistance and overpotential losses than that made of stoichiometric (La0.85Sr0.15)1.0MnO3 (LSM-A). The much poorer performance of the latter is believed to be due to the formation of resistive substances such as La2Zr2O7/SrZrO3 between LSM and YSZ phases in the composite electrode. A slight A-site deficiency (∼0.1) was effective in inhibiting the formation of these resistive substances. A power density of ∼1 W cm-2 at 800 °C was achieved with an anode-supported cell using an LSM-B/YSZ composite cathode. In addition, the effects of cathodic current treatment and electrolyte surface grinding on the performance of composite cathodes were also studied.


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