铂碳复合电极交换电流密度测试分析

利用阴极极化曲线测试法 ,测试分析了不同碳材料和不同方法制备的铂碳复合电极的交换电流密度。实验结果表明 :铂碳复合电极制备过程中碳材料的选取对其制备的复合电极交换电流密度有着非常重要的影响。在相同铂含量条件下 ,用聚亚苯基树脂碳制备的铂碳复合电极交换电流密度约为用乙炔黑制备的铂碳复合电极交换电流密度的 4 .6倍左右。实验结果还发现不同方法制备的铂碳复合电极交换电流密度也呈现出了较大的差别。离子溅射法制备的铂碳复合电极与吸附还原法和电镀法制备的铂碳复合电极相比有着更强的传输氧化还原反应电流的能力。同时还测试分析了铂含量变化对复合电极交换电流密度的影响 ,实验结果在电催化反应过程中 ,复合电极中的铂并没有完全被充分利用 ,并且随着复合电极中铂含量的增大 ,未被充分利用的铂含量比率也在增加。

The Test and Analysis of the Exchang Current Density of the Platinum Carbon Compound Electrodes

With the method of the cathode polarzation curves, the exchange current densities of the platinum carbon compound electrodes made of diffrent carbon materials and with different methods were tested. The results show that the choice of carbon materials in the process of the electrods has very important effect on the exchange current densities of the platinum carbon compound electrodes.The exchange density of the electrode made by carbon from poly( p -phenylence) is about 4.6 times as large as the exchange density of the electrode made by the carbon from acetylene black. The result also shows that the compound electrode made by ion spatter method has stronger capability of transfering reaction current than that made by adsorption deoxidize method or electroplate method. The effect of variety of platinum content on exchange current was tested. In the electric catalyst reaction, the platinum in the electrode is not used fully. The higher platinum content the electrode has, the more platinum will be losed.