钯铂合金纳米晶制备及其甲酸氧化电催化性能研究

Preparation of Pd-Pt Alloy Nanocrystal and Its Formic Acid Oxidition and Electrocatalytic Properties

在果糖和十六烷基三甲基氯化铵(CTAC)的协同作用下,以简单的一步水热法制备钯铂合金纳米晶,并研究其甲酸氧化电催化性能。研讨钯、铂前驱体用量和反应温度对产物形貌和电催化性能的影响,以及产物的形成机理。通过透射电子显微镜、能谱仪和X射线粉末衍射仪对钯铂合金纳米晶的形貌、成分及晶型进行表征,并且通过循环伏安法和计时电流法研究钯铂合金纳米晶的甲酸氧化电催化性能。结果表明:当钯铂原子比为1∶3时,合金催化剂对甲酸氧化的电催化性能和稳定性最好,其质量比活性相对钯纳米晶提高11.2倍,并且达到商业铂黑质量比活性的2.1倍。

Pd-Pt alloy nanocrystal was prepared by simple one-step hydrothermal method under synergistic effect of fructose and CTAC,and formic acid formic acid and electro-catalytic properties were investigated.The effects of Pd and Pt precursor dosage on product morphology and electro-catalytic property as well as product formation mechanism were discussed.The morphology,ingredients and crystal form of Pd-Pt alloy nanocrystal were characterized by transmission electron microscope,Energy Dispersive Spectrometer and X-ray powder diffraction.Formic acid oxidization and electro-catalytic properties of Pd-Pt alloy nanocrystal were researched by cyclic voltammetry and chronoamperometry.The results show that when the atomic ratio of Pd and Pt is 1∶3,alloy catalyst shows the best formic acid oxidization,electro-catalytic property and stability;the mass specific activity of Pd-Pt alloy nanocrystal increases by11.2times and reaches 2.1times of commercial platinum black mass ratio activity.