作　　者： ; ; ;

机构地区： 华南师范大学化学与环境学院

出　　处： 《物理化学学报》 2009年第4期719-723,共5页

摘　　要： 用循环伏安法在玻碳电极上制备出铂-氢钨青铜(Pt-HxWO3)催化剂,用扫描电子显微镜(SEM)、Raman光谱和循环伏安法研究了催化剂的组成、结构及其对甲醇氧化的催化作用.结果表明,Pt-HxWO3的活性与制备溶液中铂与钨原子比及酸度有关,与相同条件下制备的纯铂(Pt)催化剂相比,Pt-HxWO3对甲醇的氧化有更强的催化活性.当制备溶液中铂和钨的原子比为1∶8时,得到的催化剂Pt-HxWO3中铂与钨原子比为4∶1,其催化活性最佳,甲醇氧化电流是Pt作为催化剂时的1.7倍.Pt-HxWO3的强催化活性归因于其抗CO中毒能力,CO在Pt-HxWO3上氧化起始电位提前了50mV. Platinum-hydrogen tungsten bronze （Pt-HxWO3） was prepared on a glassy carbon electrode by cyclic voltammetry and its composition,morphology,structure,and activity towards methanol oxidation were characterized by scanning electron microscope （SEM）,Raman spectrum,and cyclic voltammetry. Results show that Pt-HxWO3 has better activity toward methanol oxidation than pure platinum （Pt） prepared under the same conditions. When the atomic ratio of Pt to W in the solution for the Pt-HxWO3 preparation is 1∶8,the atomic ratio of Pt to W in the prepared Pt-HxWO3 is 4∶1. This catalyst has the best activity for methanol oxidation. The peak current for methanol oxidation on this catalyst is 1.7 times that on Pt. The better catalytic activity of Pt-HxWO3 results from its better resistance to toxic CO than Pt because the CO oxidation on Pt-HxWO3 is 50 mV more negative than the case on Pt.

关 键 词： 电沉积 铂 氢钨青铜 甲醇氧化 一氧化碳

领　　域： [理学] [理学] [理学] [理学]