水浴法制备钯纳米颗粒及其修饰电极的电催化性能

利用Keggin结构的12-硅钨酸作为模板,采用水浴法还原硝酸钯制备了纳米钯.用透射电子显微镜(TEM)和X射线衍射(XRD)等手段对制备的钯纳米颗粒的形貌、粒径大小和结构进行了表征.利用滴涂法将Pd纳米颗粒修饰到Au电极表面,通过循环伏安法,研究了纳米Pd对肼的电催化性质.结果显示,制备的纳米钯为3～4 nm的类球形颗粒,为面心立方结构.纳米Pd修饰电极对肼具有良好的电催化氧化作用.在pH=6时,氧化峰电流(lpa)与肼的浓度呈现良好的线性关系.

Preparation of Palladium Nanoparticles by Water Bath Method and Electrocatalytic Properties of Its Modified Electrode

Palladium nanoparticles were synthesized by the reduction of palladium nitrate through a water bath method in the presence of 12- tungstosilicate with Keggin structure. The morphology, particle size and structure of the palladium nanoparticles were characterized by transmission electron microscopy (TEM) and X-ray diffraction analysis (XRD). In addition, the palladium nanoparticles were used to modify Au electrode. Electrocatalytic properties of nano Pd in hydrazine were studied through the cyclic voltammetry. The result shows that the spherical palladium nanoparticles with the grain diameter about 3~4 nm are obtained. The electron diffraction pattern indicates that the palladium nanoparticles are face-centered cubic polycrystalline. The Pd nanoparticles modified electrodes display excellent electrocatalytic performance for the hydrazine electrooxidation. The oxidation peak current (Ipa) increases almost linearly with the increasing of concentration of the hydrazine at pH=6