二氧化铅/石墨烯电极的制备及其电化学性能

采用沉淀结合法,制备二氧化铅/石墨烯(β-PbO₂/rGO)复合材料.通过X-射线粉末衍射仪(XRD)、场发射电子扫描显微镜(FESEM)、高分辨率透射电子显微镜(HRTEM)和比表面积分析仪研究该复合材料的结构、形貌和比表面积,利用电化学测试技术研究β-PbO₂/rGO复合电极和纯β-PbO₂电极的电化学性能.结果表明:在复合材料中,纳米β-PbO₂较均匀地分散在rGO片表面,β-PbO₂/rGO复合材料比纯β-PbO₂具有更大的比表面积;复合电极因具有更多的反应活性位点,电化学反应速度较快;在不同的电流密度下,β-PbO₂/rGO电极的质量比容量比纯β-PbO₂电极高,证明复合电极具有比纯β-PbO₂电极更好的电化学性能.

Preparation and Electrochemical Performance of PbO2/Graphene Electrode

The β-PbO₂/rGO composite material was prepared by precipitation combined with two-step hydrothermal method. The structure and morphology of the composite materials were studied by X-ray diffraction(XRD), field emission scanning electron microscopy(FESEM), high resolution transmission electron microscopy(HRTEM)and specific surface analyzer. The electrochemical performances of the β-PbO₂/rGO composite electrode and β-PbO₂ electrode were studied using electrochemical testing technology. As a result, in composite materials, β-PbO₂ nanoparticles distributed evenly on the surface of rGO sheet, and the β-PbO₂/rGO composite had a larger specific surface area than the pure β-PbO₂. The composite electrode had more active reaction sites, accordingly the electrochemical reaction rate was faster. At different current densities, the mass specific capacity of β-PbO₂/rGO electrodes was always higher than that of pure β-PbO₂ electrodes, which proves that the composite electrode has better electrochemical performance than the pristine electrode.