La 0.6 Sr 0.4 FeO 3− δ (LSF64) thin films are prepared by pulsed laser deposition (PLD) on yttria stabilized zirconia single crystals (YSZ) and characterized by electrochemical impedance spectroscopy (EIS) measurements before and after decoration with platinum nanoparticles. The platinum on the surface of LSF64 strongly accelerates the oxygen surface exchange kinetics. Especially at low oxygen partial pressures, the area-specific resistance (ASR) decreases by almost two orders of magnitude (e.g. in 0.25 mbar pO 2 from 125 Ωcm 2 to ca. 2 Ωcm 2 at 600 °C). While the pure LSF64 films exhibit severe degradation of the polarization resistance, Pt decorated films degrade much slower and show less scatter between individual samples. Surprisingly, faster oxygen incorporation (=lower polarization resistance) results for lower oxygen partial pressures, which indicates a severe mechanism change compared to undecorated LSF64 s...

中文翻译：

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铂纳米粒子修饰的La 0.6 Sr 0.4 FeO 3−δ表面的杰出氧还原动力学

通过在钇稳定的氧化锆单晶（YSZ）上进行脉冲激光沉积（PLD）制备La 0.6 Sr 0.4 FeO3-δ（LSF64）薄膜，并在用铂纳米粒子修饰之前和之后通过电化学阻抗谱（EIS）测量来表征。LSF64表面上的铂极大地促进了氧表面交换动力学。特别是在低氧分压下，面积比电阻（ASR）降低了几乎两个数量级（例如，在0.25 mbar pO 2中，从125Ωcm2到600°C时约为2Ωcm2）。虽然纯LSF64膜的极化电阻会严重降低，但装饰有Pt的膜的降解速度要慢得多，并且各个样品之间的散射也较小。出人意料的是，更快的氧气掺入（=较低的抗极化性）可降低氧气分压，