Ba0.95Ce0.9Y0.1O3-α固体氧化物燃料电池性能

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。

Performance of a Solid Oxide Fuel Cell Using Ba0.95Ce0.9Y0.1O3-

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℃.