CTAB溶液中纳米Pd粒子的形貌控制及对甲醛的电催化氧化活性

Morphology Control of Palladium Nanoparticles in CTAB Aqueous Solution and Their Electrocatalytic Activity for the Oxidation of Formaldehyde

超声辐射添加微量十六烷基三甲基溴化铵(CTAB)的PdCl2溶液,合成得到纳米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用量对纳米Pd粒子形貌的影响,并通过循环伏安法研究了纳米Pd粒子修饰玻碳电极对甲醛的电催化活性。结果表明,改变CTAB/PdCl2的摩尔比可以调控纳米Pd粒子的粒径和形貌;当CTAB与PdCl2的摩尔比为1:1、超声反应50min时,得到的纳米Pd粒子呈六边形,粒径大约为8nm,比未添加CTAB样品的比表面积增大了10m2/g,对甲醛有较高的电催化活性。

Palladium nanoparticles were prepared by adding a small quantity of hexadecyl trimethyl ammonium bromide （CTAB） into the palladium （Ⅱ） chloride aqueous solution using ultrasonics. The samples were characterized by XRD, TEM, selected area electron diffraction （SAED）, HRTEM and low temperature nitrogen adsorption-desorption. The effect of CTAB amount on the growth morphology of palladium nanoparticles was also investigated. The electrocatalytic properties of the nano-Pd modified glassy carbon （Pd/GC） electrode for formaldehyde oxidation were investigated by cyclic voltammetry. The results indicate that the size and the morphology of the nano-Pd particles can be controlled by adjusting the mole ratios of CTAB to PdCl2. The hexagonal nano-Pd particles with a narrowly distributed size of 8 nm are obtained when the mole ratio of CTAB to PdCl2 is 1：1 and the ultrasonic reaction time is 50 min. The nanoparticles obtained by CTAB addition possess larger BET surface area compared to that without surfactant by 10 m2/g, thus showing the excellent electrocatalytic activity for the formaldehyde oxidation.