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首页> 外文期刊>Electrocatalysis >Oxygen Electroreduction in Alkaline Solution on Pd Coatings Prepared by Galvanic Exchange of Copper
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Oxygen Electroreduction in Alkaline Solution on Pd Coatings Prepared by Galvanic Exchange of Copper

机译：通过电镀铜制铜制备的PD涂层氧气溶液中的氧气电

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摘要

Thin Pd coatings were obtained on glassy carbon electrodes by galvanically replacing the electron beam-deposited copper layers with palladium. The prepared electrodes were studied by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The electrodes were electrochemically tested for oxygen reduction reaction (ORR) employing the rotating disc electrode (RDE) method in alkaline solution. The remaining copper was detected for two of the thickest (5 and 10 nm) sacrificial Cu layers using energy-dispersive X-ray spectroscopy (EDX). SEM images of thin Pd films showed some larger particle growth for all the studied film thicknesses, but spherical particles such as those achieved for example by the electron beam evaporation method were not visible. Specific activity of the electrodes for O-2 reduction did not depend on the thickness of the sacrificial copper layer. The O-2 reduction reaction followed a four-electron pathway with a mechanism similar to that of commercial Pd/C, where the first electron transfer to the O-2 molecule is the rate-determining step.
机译：通过用钯的电子束沉积的铜层在玻璃碳电极上获得薄PD涂层。通过扫描电子显微镜（SEM）和X射线光电子能谱（XPS）来研究制备的电极。电化学测试用于采用碱性溶液中的旋转盘电极（RDE）方法的氧还原反应（ORR）。使用能量分散X射线光谱（EDX）对较长的（5和10nm）牺牲Cu层中的两个检测到剩余的铜。薄PD膜的SEM图像显示出所有研究的膜厚度的一些较大的颗粒生长，但是诸如例如通过电子束蒸发方法实现的球形颗粒是不可见的。用于O-2还原的电极的比活性不依赖于牺牲铜层的厚度。 O-2还原反应遵循具有类似于商业Pd / c的机制的四电子通路，其中第一电子转移到O-2分子是速率确定步骤。

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