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用涂覆加压成型方法制备了具有钙钛矿结构的 La1 - x Srx Co O3多孔气体扩散电极 ,测定了它们的稳态阴极极化曲线和循环伏安图谱。通过对多孔铂电极与 La1 - x Srx Co O3多孔气体扩散电极的相关曲线的对照分析 ,得出了L a1 - x Srx Co O3在碱性条件下 ,具有比铂更好的氧还原催化活性的结论。并计算出 L a1 - x Srx Co O3多孔电极的表观交换电流密度 i0 =7.6 8× 1 0 - 4 A/cm2 ,比同样条件下的铂电极的 i0 高 3～ 4个数量级。
La1 - x Srx CoO3 porous gas diffusion electrodes with perovskite structure were prepared by pressure - coating method and their steady state cathodic polarization curves and cyclic voltammograms were measured. The comparative analysis of the correlation curves between porous platinum electrodes and La1 - x Srx CoO3 porous gas diffusion electrodes shows that La1 - x Srx CoO3 has better oxygen reduction catalytic activity than platinum under alkaline conditions in conclusion. The apparent exchange current density i0 = 7.68 × 10 4 - A / cm 2 for the L a1 - x Srx CoO3 porous electrode was calculated, which was 3 to 4 orders of magnitude higher than that of the platinum electrode under the same conditions.