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采用调变的多元醇法制备了高分散的Pt/C,PtRu/C和Ru/C电催化剂.XRD计算结果表明,PtRu/C电催化剂的平均粒径和合金度分别为2.2 nm和71%.采用电化学方法和原位傅里叶变换红外反射光谱方法(in situFTIRS)研究了甲醇在3种电催化剂上的吸附氧化过程,发现PtRu/C对甲醇的催化活性明显高于Pt/C,Ru的加入一方面影响了甲醇在Pt上的解离吸附性能,另一方面提供了Ru-OH物种,从而抑制了低电位下电催化剂中毒.红外光谱研究结果表明,线性吸附态CO(COL)是主要毒化物种,反应产物主要是CO2,还有少量的甲酸甲酯.根据实验结果讨论了甲醇在PtRu/C电催化剂上的氧化机理.
Highly dispersed Pt / C, PtRu / C and Ru / C electrocatalysts were prepared by the modified polyol method.The results of XRD showed that the average particle size and the alloying degree of PtRu / C electrocatalysts were 2.2 nm and 71% The adsorption and oxidation of methanol on three kinds of electrocatalysts were studied by electrochemical method and in-situ Fourier transform infrared reflectance spectroscopy (in situFTIRS). The catalytic activity of PtRu / C to methanol was higher than that of Pt / C. The addition of Ru affected the dissociative adsorption of methanol on Pt on the one hand and the Ru-OH species on the other hand, thus inhibiting the poisoning of the electrocatalyst at low potential.The results of IR spectroscopy showed that the linear adsorption state CO (COL) Is the main toxic species, the reaction product is mainly CO2, and a small amount of methyl formate.According to the experimental results, the oxidation mechanism of methanol on PtRu / C electrocatalyst is discussed.