超声诱导CTAB/SDS溶液中纳米Pd粒子的形貌控制及对甲醛的电催化氧化

Ultrasonic-induced Morphology Control of Palladium Nanoparticles in CTAB/SDS Solution and Its Electrocatalytic Activity for Oxidation of Formaldehyde

在十六烷基三甲基溴化铵(CTAB)-十二烷基硫酸钠(SDS)混合乙醇水溶液中,超声辐射PdCl2,合成了纳米Pd粒子,用XRD、TEM、选区电子衍射(SAED)、HRTEM和低温氮吸附-脱附等技术进行了表征,考察了CTAB/SDS组成对纳米粒子形貌的影响,纳米Pd粒子修饰玻碳电极对甲醛的电催化活性也通过循环伏安法进行了研究。结果表明:通过改变CTAB/SDS组成可以调控纳米Pd粒子的粒径和形貌;当CTAB与SDS物质的量之比为1∶1、超声反应60min时,得到呈多边形的纳米Pd粒子,粒径范围在10～20nm之间,比未添加表面活性剂样品的比表面积增大了14m2.g-1,对甲醛有较高的电催化活性。

Nano-Pd particles were prepared using ultrasonic irradiation in the palladium（Ⅱ） chloride H2O/EtOH（5/1,V/V） solution by the addition of a quantity of hexadecyl trimethyl ammonium bromide（CTAB） and sodium dodecyl sulfonate（SDS）.The samples were characterized by XRD,TEM,selected area electron diffraction（SAED）,HRTEM and low temperature nitrogen adsorption-desorption.The effects of the composition of CTAB and SDS on the growth morphology of palladium nanoparticles were investigated.The electrocatalytic properties of the nano-Pd modified glassy carbon electrode（Pd/GCE） for formaldehyde oxidation were also investigated by cyclic voltammetry.The results indicate that a promising possibility of a size and morphology for the nano-Pd particles are controled by adjusting the composition of CTAB and SDS.The polygonal nano-Pd particles with a distributed size of 10-20nm are obtained when the molar ratio of CTAB∶SDS is 1∶1 and the reaction time is 60min.The nanoparticles obtained by addition of two surfactants（CTAB and SDS） increase the BET surface area by 14m2·g-1 compared to that obtained without surfactant,which show the excellent electrocatalytic activity for the oxidation of formaldehyde.