不同炭材料制备的铂炭复合电极电化学参数

以乙炔黑、石墨乳、聚苯胺树脂炭和聚亚苯基树脂炭为载体。用化学吸附还原法制备了不同炭材料的铂炭复合电极，采用恒电位法测定了这些铂炭复合电极的阴极极化曲线，并在此基础上求出了复合电极的有关电化学参数，实验结果发现：不同炭材料制备的铂炭复合电极交换电流密度相差较大，在相同铂含量条件下用聚亚苯基树脂炭制备的铂炭复合电极变换电流密度为０．２６７ｍＡ．ｃｍ＾－２，而用乙炔黑制备的铂炭复合电极交换电流密度仅为０

ELECTROCHEMICAL PARAMETERS OF PLATINUM CARBON COMPOUNDELECTRODES MADEBY DIFFERENT CARBON MATERIALS

With acetylene black, graphit milk,carbon derived from polyaniline and carbon derived from poly(p- phenylene) as carbon materials, the different type of platinum carbon compond electrodes were prepared by chemical adsorption reduction method, and then the curves of cathode over voltage relationship with polarization electrical current were tested,based on the tested curve, the electrochenmical parameters of the platinum carbon compound electrodes were obtained. The results found that there are evidently different among the exchange electrical current density of the electrodes made by different carbon materials.In the same content of platinum condition, the exchange current density of the platinum carbon compound electrode made by carbon from poly(p-phenylene) is 0.267mA. cm-2, and yet the exchange current density of the platinum carbon compound electrode made by acetylene black is only 0.058mA.cm-2, the discrepancy between them is about 4. 6 time. The results also found that the Tafel constant values of the platinum carbon compound electrodes were changed with the carbon materials altered,and the Tafel constant a had the bigger more change than the Tafel constant b in the some conditions. The test results also indicated that the carbon materials had also the effect on the symmetry coefficient of the platinum carbon compound electrodes,therefore the polarization of the platinum carbon compound electrodes can also be changed by using diferent carbon materials.