Graphite carbon nitride(g-C3N4)is a kind of 2D semiconductor materials with unique electronic structure, large specific surface area, low-cost, good chemical stability and thermal stability ,which has a great application prospect in supercapacitors .In this paper , a two -dimensional layered graphite -like C3 N4/C -DOTs composite was successfully synthesized via a facile sintering process of urea and C -DOTs′ethanol solu-tion.The structure and morphology of the composite is folded layer with uniform 6 nm C-DOTs particles on its surface with large surface area, which characterized by TEM, SEM and XRD.As an electrode material of super-capacitor,the curves of the CV show the ideal capacitive rectangle characteristics at different speeds , and when the sweep speed increases to 400 mV/s, the curve still maintains rectangle , which indicate the material has small internal resistance and excellent magnification performance .When current density of 2 A/g, specific ca-pacity can reach 216.4 F/g, charge and discharge efficiency is 94.5%.Compared with the pure g-C3 N4 , g-C3 N4/C-DOTs composite material with more specific storage performance and higher charge -discharge effi-ciency is an ideal supercapacitor electrode materials .%石墨相氮化碳(g-C3 N4)是一种类石墨烯状二维半导体材料,具有独特的电子结构、比表面积大、廉价易得、化学稳定性和热稳定性良好等特点,在超级电容器领域有着巨大的应用前景.本文以尿素和碳点(C-DOTs)的乙醇溶液为原料,采用一步烧结法制得二维层状g-C3 N4/C-DOTs复合材料,对其进行透射电镜(TEM)、扫描电镜(SEM)、X射线粉末衍射(XRD)分析,发现复合材料具有类石墨烯的片层状褶皱结构,片层表面均匀分布粒径为6 nm的碳点,具有较大的比表面积.将材料用作扣式超级电容器电极材料进行电化学测试,在不同扫速下其CV曲线均呈现出理想的电容矩形特征,且当扫速增大到400 mV/s时,曲线仍没有偏离矩形,说明材料内阻小,倍率性能优异.当电流密度为2 A/g时,比容量可达到216.4 F/g,充放电效率为94.5%.与单纯氮化碳材料相比,g-C3 N4/C-DOTs复合材料具有更大的比容量性能和更高的充放电效率,是一种理想的超级电容器电极材料.
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