物理化学学报 >> 2004, Vol. 20 >> Issue (01): 43-46.doi: 10.3866/PKU.WHXB20040109

研究论文 上一篇    下一篇

高性能镓酸镧基电解质燃料电池

王世忠   

  1. 厦门大学化学系,厦门 361005
  • 收稿日期:2003-06-25 修回日期:2003-09-01 发布日期:2004-01-15
  • 通讯作者: 王世忠 E-mail:shizwang@sohu.com

High Performance Fuel Cells Based on LaGaO3 Electrolytes

Wang Shi-Zhong   

  1. Department of Chemistry, Xiamen University, Xiamen 361005
  • Received:2003-06-25 Revised:2003-09-01 Published:2004-01-15
  • Contact: Wang Shi-Zhong E-mail:shizwang@sohu.com

摘要: 制备并用多种电化学方法研究了LaGaO3基高性能中温固体氧化物燃料电池的电极和电解质材料,组装出了高性能单电池.实验发现, Co掺杂的La0.8Sr0.2Ga0.8Mg0.2O3电解质中, Co含量的增加显著提高了电解质的氧离子电导率,电解质的氧迁移数略有减小,是非常好的中、低温燃料电池电解质.钴掺杂的电解质不仅显著减小了电池的欧姆电阻,而且减小了电池的阴、阳极极化过电位.以La0.8Sr0.2Ga0.8Mg0.11Co0.09O3为电解质时电池在1073、973、873 K下的最大输出功率密度分别达到1.77、0.92、0.41 W•cm-2,是非常有前景的电池体系.

关键词: 固体氧化物燃料电池, 阴极, 阳极, 镓酸镧基电解质, 氧迁移数

Abstract: High performance intermediate temperature solid oxide fuel cells(ITSOFC) based on LaGaO3 electrolytes were constructed, and the electrochemical properties of the cells were studied in detail. Ni-15% (mole fraction x) Sm3+ doped CeO2 (Ni-SDC) anode and Sm0.5Sr0.5CoO3 (SSC) cathode were prepared with the impregnation method, and La0.8Sr0.2Ga0.8Mg0.2-xCoxO3 (LSGMC, x=0, 0.01, 0.05, 0.07, 0.09)electrolytes were prepared with solid state reaction. The performance of the cell was improved significantly using LSGMC due to the decrease of ohmic resistance of the cell and the electrode over-potential. The maximum power densities of Ni-SDC/ La0.8Sr0.2Ga0.8Mg0.11Co0.09O3/SSC at 1073, 973, 873 K reached 1.77, 0.92, and 0.41 W•cm-2, respectively. The addition of cobalt into La0.8Sr0.2Ga0.8Mg0.2O3 improved its ionic conductivity significantly while the oxygen transfer number decreased slightly. For an example, the electrical conductivity of La0.8Sr0.2Ga0.8Mg0.11Co0.09O3 was about 0.21 S•cm-1, and the oxygen transfer number was about 0.87 at 1073 K, while the electrical conductivity of La0.8Sr0.2Ga0.8Mg0.2O3 was about 0.12 S•cm-1, and the oxygen transfer number was close to 1.

Key words: Solid oxide fuel cell, Cathode,Anode, Electrolytes based on LaGaO3,  Oxygen transfer number