中文摘要：

以PdCl2为金属前驱体,在水-乙醇混合体系内,添加微量的CTAB,简易加热合成单分散纳米Pd粒子,用XRD和TEM等技术进行了表征,考察了PdCl2/CTAB组成对纳米粒子形貌和尺寸的影响,通过循环伏安法对纳米Pd粒子修饰玻碳电极对甲醛的电催化活性进行了研究。结果表明,通过改变PdCl2/CTAB组成可以调控纳米Pd粒子的粒径和形貌;当PdCl2与CTAB的物质的量之比为1∶21、于（70±1）℃反应3h时,得到呈单分散性的多边形纳米钯粒子,粒径为（8±1）nm,它对甲醛有较高的电催化活性。

英文摘要：

Monodispersed nano-Pd particles were prepared via a simple heating method in palladium（II ） chloride H2O/EtOH （5/1,V/V） solution with hexadecyl trimethyl ammonium bromide （CTAB） added. The samples were characterized by XRD and TEM. The effects of the composition of PdCl2 and CTAB on the growth morphology and size of Pd nanoparticles were investigated. The electrocatalytic properties of the nano- Pd modified glassy carbon （Pd/GC） electrode for formaldehyde oxidation were also measured by cyclic voltammetry. The results indicate that a promising possibility of a size and morphology of the nano-Pd particles are controlled by adjusting the composition of PdC12 and CTAB. The polygonal nano-Pd particles with a distributed size of （8±1） nm can be obtained when the molar ratio of PdCl2 ：CTAB is 1：21 and the reaction time is 3h at （70±1）℃. These Pd nanoparticles show the excellent electrocatalytic activity for the oxidation of formaldehyde.