调变多元醇法制备高载量Pt/C催化剂对甲醇氧化的电催化活性

Pt/C Catalyst with High Pt Loading Prepared by a Modified Polyol Process and Its Catalytic Activity to Methanol Oxidation

采用一种新的调变多元醇法制备用于直接甲醇燃料电池的50%(质量分数,下同)Pt/C阴极电催化剂。利用X射线衍射、透射电镜以及动态伏安法表征催化剂的物相组成、微观组织形貌以及电化学性能。研究结果表明,该法制备的Pt/C催化剂平均粒度小(约为2.52 nm)、粒度分布均匀、分散性好,峰电流密度为740.7 mA/mg。通过对比实验,发现采用该法制备的催化剂对甲醇氧化的电催化活性、稳定性均优于同类型载铂量更高的商品催化剂。

Pt/C catalyst with high Pt loading used in direct methanol fuel cells （DMFCs） was prepared by a new modified polyol method. Transmission electron microscopy （TEM）, X-ray diffraction （XRD） and cyclic voltammograms （CVs） were used to characterize the composition morphology and the electrochemical properties of the Pt/C catalyst. The results reveal that the Pt nanoparticles have small average particle size （-2.52 nm）, with high dispersion on the carbon support. The Pt/C catalyst exhibits higher catalytic activity and stability than that of the JM70%-Pt/C. It is suggested that the modified polyol method is efficient for Pt/C catalyst preparation.