中文摘要：

采用微波辅助加热乙二醇法制备了碳纳米管（CNTs）负载的PtSn双组份催化剂。采用原子吸收光谱,X射线衍射仪和电子透射显微镜对产物进行了表征。结果表明,含金属离子前驱体的乙二醇溶液的pH值对产物的金属催化剂负载量、合金化程度和PtSn粒子的形态有显著的影响。在pH值为5时能得到组分配比为原始设计值的PtSn/CNT催化剂。在pH值2~7的范围内纳米粒子的尺寸较小,随着pH值的进一步提高,纳米粒子直径变大且发生团聚。电化学测试表明在pH值为5时得到的PtSn/CNT催化剂对甲醇电化学氧化具有最佳的催化作用。合适的金属负载比例和良好的纳米颗粒形状和尺寸分布控制是得到优异的催化性能的主要原因。

英文摘要：

Carbon nanotubes （CNTs） decorated with PtSn nanoparticles （PtSn/CNT） were prepared by the microwave-assistedethylene glycol reduction method and characterized by atomic adsorption spectroscopy,X-ray diffraction and transmission electron microscopy. Results indicated that the loading efficiency of the metal catalyst,and the degree of alloying and morphology of the PtSn nanoparticles were significantly affected by the solution pH value of the metallic ions in the ethylene glycol. The required com-position of the PtSn/CNT catalysts could be obtained by adjusting the pH value to about 5, which is almost the isoelectric point of the acid-treated CNTs. The size of the PtSn nanoparticles decreased with the pH value in the range 2 to 7,but they became large and agglomerated when the pH value was greater than 7. Electrocatalytic activity tests indicated that the PtSn-CNTs prepared at pH 5 had the best catalytic performance towards methanol oxidation. The improvement in catalytic activity was mainly attributed to a high loading efficiency and control of particle shape and size distribution.