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首页> 外文会议>Fourth International Symposium on Ionic and Mixed Conducting Ceramics, null >OXYGEN REACTIONS AT PLATINUM/YTTRIA-STABILIZED ZIRCONIA (YSZ) INTERFACES
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OXYGEN REACTIONS AT PLATINUM/YTTRIA-STABILIZED ZIRCONIA (YSZ) INTERFACES

机译：铂/钇稳定氧化锆（YSZ）界面上的氧反应

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摘要

The focus of this paper is the establishment of reliable methods for the determination of the mechanism and kinetics of the oxygen reduction reaction (ORR) at Pt/YSZ interfaces. Techniques used include cyclic voltammetry (CV) and ac impedance methods over a temperature range from 400 to 1000 ℃. The exchange currents for the ORR, determined both from the low field CV data and the charge transfer resistance, agreed closely and yielded an apparent activation energy which was independent of the nature of the Pt employed. A hysteresis behavior was observed in the cathodic CV scans, which correlated with a low frequency inductor seen in the impedance response. The hysteresis effect, which makes a normal Tafel slope analysis impossible, is more pronounced at higher currents (larger overpotentials and higher temperatures) and after higher cathodic charges have passed (e.g., at lower sweep rates). This effect may be related to the nucleation of additional active sites at the triple phase boundary length. This is sometimes reversible, while under other conditions, results in a permanent enhancement of the ORR currents.
机译：本文的重点是建立可靠的方法来确定Pt / YSZ界面上的氧还原反应（ORR）的机理和动力学。使用的技术包括在400至1000℃温度范围内的循环伏安法（CV）和交流阻抗法。由低场CV数据和电荷转移电阻确定的ORR交换电流紧密一致，并产生了明显的活化能，该活化能与所用Pt的性质无关。在阴极CV扫描中观察到磁滞行为，这与在阻抗响应中看到的低频电感器相关。滞后效应使不可能进行正常的塔菲尔斜率分析，在较高的电流（较大的过电势和较高的温度）下以及在较高的阴极电荷通过之后（例如，较低的扫描速率下），滞后效应更加明显。此效应可能与三相边界长度处其他活性位点的成核有关。有时这是可逆的，而在其他条件下会导致ORR电流的永久增加。

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