化学学报 ›› 2001, Vol. 59 ›› Issue (12): 2084-2088. 上一篇    下一篇

研究论文

Ba0.95Ce0.9Y0.1O3-α固体氧化物燃料电池性能

马桂林;顾仁敖;石慧;陈蓉;仇立干;贾定先   

  1. 苏州大学理学院化学化工系.215006;苏州市卫生学校
  • 发布日期:2001-12-15

Performance of a solid oxide fuel cell using Ba0.95Ce0.9Y0.1O3-α

Ma Guilin;Gu Renao;Shi Hui;Chen Rong;Qiu Ligan;Jia Dingxian   

  1. Suzhou UnivSuzhou, Coll of sci, Dept of chem and chem ind.苏州
  • Published:2001-12-15

以Ba0.95Ce0.9Y0.1O3-α为固体电解质,Pt为电极,组成氢-空气燃料电池,测定了该电池600~1000℃下电流-电压特性、电极极化特性和电解质中各电荷载流子(质子、氧离子、电子空穴)迁移数及其电导率。实验表明,该电池放电性能良好,能稳定地输出电能,1000℃时的最大输出电流密度为680mA.cm^-^2。正、负Pt电极极化特性很小,放电时的电压耗损主要由电解质电阻产生。在氢-空气燃料电池条件下,Ba0.95Ce0.9Y0.1O3-α显示混合离子(质子+氧离子)导电性。随着温度升高,质子迁移数减小而氧离子迁移数增大,当温度为780℃时,质子和氧离子迁移数相同(0.46),在低于780℃时,质子电导占优势,而在高于780℃时,氧离子电导占优势。

关键词: 燃料电池, 钙钛矿型结构, 氧化钡, 氧化钴, 氧化钇

A hydrogen-air fuel cell using Ba0.95Ce0.9Y0.1O3-α as the solid electrolyte and porous Pt as the electrode was constructed. The Ⅰ-Ⅴ performance of the cell and the polarization characteristics of the electrodes are investigated in the temperature range of 600~1000℃. The transport numbers and conductivities of each charge carrier are also determined. It is found that the fuel cell exhibits good and stable performance. The maximum short-circuit current density drawn fom the cell is about 680 mA.cm^-^2 at 1000℃. The polarizations at both electrodes are very small and the voltage on discharging of the cell is limited mainly by the ohmic resistance of the hydrogen-air fuel cell condition. The proton transport number decreases, whereas the oxide-ion transport number increases with increasing temperature. The transport numbers of proton and oxideion are equal (0.46) at 780℃ , the proton conduction is predominant below 780℃, but the oxide-ion conduction becomes predominant above 780℃.

Key words: FUEL CELLS, PEROVSKITE TYPE STRUCTURE, BARIUM OXIDE, COBALT OXIDE, YTTRIUM OXIDE

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