石墨烯纳米片的简易合成及其超级电容性能研究

摘要

Graphene nanoplates (GNS) were prepared from oxided graphite by using thiosemicarbazide (CH5N3S) as a reducing agent.The microstructures and morphologies of products were subsequently characterized by XRD,FE-SEM,AFM and UV-Vis adsorption spectra.The performances of super-capacitor were characterized using cyclic voltammetry and constant current charge-discharge tests.The experimental results indicated that the as-prepared GNS possessed fair crystalline state and admirable aqueous dispersibility.An electrode prepared from GNS exhibited a specific capacitance of 75 F/g at a current density of 500 mA/g in 3 mol/L KOH electrolyte.Moreover,the GNS showed excellent electrochemical cycle performance.%以硫代氨基脲(CHsN3S)为还原剂,通过还原氧化石墨(GO)制备了石墨烯纳米片(GNS).利用XRD,FE-SEM,AFM和UV-Vis光谱对产物的结构和形貌进行分析,并使用循环伏安和恒流充放电等测试手段来表征其超级电容性能.实验结果表明,所制备的GNS具有良好的结晶状态,并且在水溶液中具有良好的分散性.以GNS纳米片为电极材料,在3 mol/L KOH电解质溶液中,在500 mA/g电流密度测试条件下所得比电容量为75 F/g.而且GNS纳米片显示出了良好的电化学循环稳定性.