摘要
以氧化石墨烯、硫酸锰和高锰酸钾为原料,通过控制原料的配比、水热反应的时间与温度以及体系的p H值,制备了不同反应条件下的石墨烯/二氧化锰(RGO/MnO2)复合材料.采用傅里叶红外光谱(FT-IR),X射线衍射(XRD)、扫描电子显微镜(SEM)以及X射线能谱(EDS)对复合材料的形貌和结构进行了表征.结果发现:复合材料呈现出一种包覆状结构,二氧化锰有效嵌入石墨烯片层之间和包覆在其表面,既阻止了石墨烯片的团聚又能够很好地发挥协同效应;水热反应的时间和温度是影响复合材料形貌和结构的主要因素;通过循环伏安曲线和交流阻抗谱分析复合材料的电化学性能,测试结果表明二氧化锰的加入提高了复合材料的比电容量,在1 mol/L的Na2SO4电解液,2 mV/s扫描速率下,材料的最佳比电容量达到380 F/g.
Graphene oxide,manganese sulfate and potassium permanganate were used as raw materials to prepare graphene/manganese dioxide composites( RGO/MnO2) under different reaction conditions by controlling the ratio of raw materials, the time and temperature of hydrothermal reaction and the pH value of the system. The morphology and structure of the composites were characterized by Fourier transform infrared spectroscopy( FT-IR),X-ray diffraction( XRD), scanning electron microscopy( SEM) and X-ray spectroscopy( EDS). The results showed that the composites exhibited a coating structure. Manganese dioxide is effectively embedded between the graphene lamellae and coated on the surface of the composite,which not only prevents the agglomeration of the graphene lamellae,but also has a good synergistic effect. The time and temperature of hydrothermal reaction are the main factors affecting the morphology and structure of the composite. The electrochemical properties of the composites were analyzed by cyclic voltammetry curves and electrochemical impedance spectroscopy. The results showed that the specific electric capacity of the composites is improved with the addition of manganese dioxide. The optimal specific electric capacity of the composites reached 380 F/g in 1 mol/L Na2SO4 electrolyte and 2 mV/s scanning rate.
作者
李静梅
张辉
LI Jing-mei;ZHANG Hui(Shenyang University of Chemical Technology,Shenyang 110142,China)
出处
《沈阳化工大学学报》
CAS
2020年第1期31-40,共10页
Journal of Shenyang University of Chemical Technology
关键词
氧化石墨烯
石墨烯
二氧化锰
电化学
graphene oxide
graphene
manganese dioxide
electrochemistry
