Acta Phys. -Chim. Sin. ›› 2006, Vol. 22 ›› Issue (08): 958-961.doi: 10.3866/PKU.WHXB20060810

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Preparation of Sm0.5Sr0.5CoO3-La0.8Sr0.2Ga0.8Mg0.15Co0.05O3 composite cathodes using wet-chemistry method and characterization of their properties

ZOU Yu-Man;WANG Shi-Zhong   

  1. Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University , Xiamen 361005,Fujian, P. R. China
  • Received:2006-01-26 Revised:2006-03-22 Published:2006-08-04
  • Contact: WANG Shi-Zhong E-mail:shizwang@sohu. com

Abstract: Sm0.5Sr0.5CoO3(SSC)-La0.8Sr0.2Ga0.8Mg0.15Co0.05O3(LSGMC5) composite cathodes for intermediate temperature solid oxide fuel cells were prepared using wet-chemistry method. The Sm0.5Sr0.5CoO3(SSC) powders were prepared by the glycine-nitrate method and the La0.8Sr0.2Ga0.8Mg0.15Co0.05O3(LSGMC5) powders were synthesized by the citrate method. XRD pattern of SSC powders calcined at a temperature over 950℃ corresponded to a desired perovskite structure. With the increase in sintering temperature, the size of SSC particles increased, which leaded to a weak adhesion on electrolyte for electrodes based on SSC sintered at high temperatures. Multiple techniques were applied to characterize the oxygen reduction reaction over SSC-LSGMC5 cathodes based on SSC sintered at various temperatures(1173-1373K). The results demonstrated that the performance of SSC-LSGMC5 composite electrodes depended strongly on the sintering temperature of SSC. Electrodes based on SSC sintered at1223K exhibited the lowest ohmic resistance and polarization resistance among the electrodes studied , and the overpotential at 973 K under 1A· cm-2 current density was as low as 0.077 V.

Key words: Glycine-nitrate method, Solid oxide fuel cell, Sm0.5Sr0.5CoO3 Cathode, Oxygen reduction, Sintering temperature