二氧化铅/石墨烯电极的制备及其电化学性能

Preparation and Electrochemical Performance of PbO_2/Graphene Electrode

采用沉淀结合法,制备二氧化铅/石墨烯(β-PbO_2/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-PbO_2/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-PbO_2较均匀地分散在rGO片表面,β-PbO_2/rGO复合材料比纯β-PbO_2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-PbO_2/rGO电极的质量比容量比纯β-PbO_2电极高,证明复合电极具有比纯β-PbO_2电极更好的电化学性能.

TheβPbO 2/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 theβPbO 2/rGO composite electrode andβPbO 2 electrode were studied using electrochemical testing technology.As a result,in composite materials,βPbO 2 nanoparticles distributed evenly on the surface of rGO sheet,and theβPbO 2/rGO composite had a larger specific surface area than the pureβPbO 2.The composite electrode had more active reaction sites,accordingly the electrochemical reaction rate was faster.At different current densities,the mass specific capacity ofβPbO 2/rGO electrodes was always higher than that of pureβPbO 2 electrodes,which proves that the composite electrode has better electrochemical performance than the pristine electrode.