Development of (La,Sr)MnO3-based cathodes for intermediate temperature solid oxide fuel cells

S. P. Jiang, Yongjun Leng, S. H. Chan, K. A. Khor

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Abstract

Conventional (La, Sr)MnO3 (LSM) electrodes modified by ion impregnation methods showed promising potential as cathodes for intermediate temperature solid oxide fuel cells. After impregnation of ionic conducting-type Gd0.2Ce0.8(NO3)x nitrite salt solution into the LSM structure, electrochemical activity of LSM electrodes for the O2 reduction reaction was substantially enhanced. At 700°C, the electrode polarization resistance of impregnated LSM electrodes decreased to 0.72 Ω cm2 as compared to 26.4 Ω cm2 for pure LSM electrodes, a reduction in electrode polarization resistance by 36 times. The polarization losses were also reduced substantially. At 300 mA cm-2 and 700°C, overpotential for the O2 reduction was reduced from 0.79 V on pure LSM to 0.19 V on impregnated LSM electrodes, a reduction in overpotential by four times. Ion-impregnated LSM electrodes showed better performance than those of LSM/Y2O3-ZrO2 and LSM/(Gd,Ce)O2 composite electrodes as reported in the literature.

Original languageEnglish (US)
JournalElectrochemical and Solid-State Letters
Volume6
Issue number4
DOIs
StatePublished - Apr 1 2003

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Electrochemistry
  • Electrical and Electronic Engineering

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