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

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Abstract

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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Authors and Affiliations

  1. Fuel Cell Strategic Research Programme, School of Mechanical and Production Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798

    Y.J. Leng, S.H. Chan, K.A. Khor & S.P. Jiang

Authors
  1. Y.J. Leng
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  2. S.H. Chan
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  3. K.A. Khor
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  4. S.P. Jiang
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Correspondence to S.H. Chan.

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Leng, Y., Chan, S., Khor, K. et al. Development of LSM/YSZ composite cathode for anode-supported solid oxide fuel cells. Journal of Applied Electrochemistry 34, 409–415 (2004). https://doi.org/10.1023/B:JACH.0000016627.29374.24

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  • DOI: https://doi.org/10.1023/B:JACH.0000016627.29374.24

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