纳米Pd/石墨烯-碳纳米管的制备及乙醇电氧化性能

Preparation and Performance for Ethanol Oxidation of Nano-Pd/ Graphene Nanoplatelets-Carbon Nanotubes

为了提高乙醇氧化催化剂的电催化活性和稳定性,以石墨烯纳米片(GNPs)和碳纳米管(CNTs)的混合物为载体,利用微波辅助多元醇还原法制备了具有特殊空间结构的Pd/GNPs-CNTs电催化剂。透射电镜(TEM)、X-射线光电子能谱(XPS)表征结果表明,混合载体的使用改善了Pd粒子的分散性,平均粒径为3.3 nm。电化学表面积(ECSA)、循环伏安(CV)、电化学阻抗谱(EIS)、计时电流(CA)等电化学测试表明催化剂电化学表面积增大,氧化峰电流密度达到100 m A/cm2,氧化起始电位负移至-0.556 V,对乙醇氧化呈现出更高的电催化活性和更好的稳定性。

In order to further improve electrocatalytic activity and stability toward ethanol oxidation, Pd/GNPs-CNTs electrocatalyst was prepared through the microwave-assisted synthesis method using the mixture of grapheme(GNP) and carbon nanotubes(CNT) as support. Transmission electron microscopy(TEM) X-ray composition spectroscopy(XPS) were used to characterize the particle size and crystallinity of the catalysts. The Pd nanoparticles were well dispersed on the surface of the mixture support with an average particle size of 3.3 nm. The electrocatalytic oxidation of ethanol was studied by electrochemically active surface area(ECSA), cyclic voltammetry(CV), electrochemical impedance spectroscopy(EIS), and chronoamperometry(CA) measurements. It was found that the ECSA increased and the current density of the ethanol oxidation reaction reached 100 m A/cm2. The onset potential of ethanol oxidation shifted negatively to-0.556 V. The Pd/GNPs-CNTs catalyst exhibits higher electrocatalytic activity and better stability for ethanol oxidation.