物理化学学报 >> 2006, Vol. 22 >> Issue (08): 958-961.doi: 10.3866/PKU.WHXB20060810

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用湿化学法制备Sm0.5Sr0.5CoO3-La0.8Sr0.2Ga0.8Mg0.15Co0.05O3复合阴极及其性能表征

邹玉满;王世忠   

  1. 厦门大学化学化工学院 化学系, 厦门 361005
  • 收稿日期:2006-01-26 修回日期:2006-03-22 发布日期:2006-08-04
  • 通讯作者: 王世忠 E-mail:shizwang@sohu. com

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

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摘要： 用湿化学法制备了Sm0.5Sr0.5CoO3(SSC)－La0.8Sr0.2Ga0.8Mg0.15Co0.05O3(LSGMC5)中温固体氧化物燃料电池复合阴极材料，其中SSC用甘氨酸－硝酸盐法合成，LSGMC5用柠檬酸盐法合成。XRD结果表明，甘氨酸－硝酸盐法制备的SSC在焙烧温度大于1223K即表现为单一的钙钛矿结构。随焙烧温度的升高，SSC粉末颗粒增大,导致含有高温烧结SSC的电极与电解质界面结合变差。采用多种技术考察了利用不同温度（1173－1373K）预烧的SSC粉末制备的SSC-LSGMC5阴极上进行的氧还原反应。结果表明，SSC-LSGMC5复合电极的性能显著依赖于电极中SSC粉末的预烧温度，当SSC粉末焙烧温度在1223K附近时，具有最小的欧姆电阻以及氧还原反应极化电阻，1A· cm-2电流密度下的极化过电位为0.077 V。

关键词: 甘氨酸－硝酸盐法, 固体氧化物燃料电池, Sm0.5Sr0.5CoO3阴极, 氧还原, 焙烧温度

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