Effect of preparation methods on dispersion stability and electrochemical performance of graphene sheets
Effect of preparation methods on dispersion stability and electrochemical performance of graphene sheets
复制标题
制备方法对石墨烯片分散稳定性和电化学性能的影响
DOI：
10.1016/j.jssc.2017.01.009
复制
发表时间：
2017-05-01
影响因子：
3.3
通讯作者：
Lin, Zhengping
中科院分区：
文献类型：
--
作者：
Chen, Li;Li, Na;Lin, Zhengping
化学剥离法是制备石墨烯的重要方法之一。石墨烯片的聚集严重阻碍了石墨烯表现出优异的性能。然而，没有尝试研究制备方法对石墨烯片的分散性的影响。本研究采用Hummers法、改良Hummers法和改进Hummers法三种化学剥离法制备石墨烯片。研究了制备方法对石墨烯片的结构、在有机溶剂中的分散稳定性和电化学性能的影响。采用傅里叶变换红外显微镜、拉曼光谱、透射电子显微镜和紫外-可见分光光度法对石墨烯片的结构进行了分析。结果表明，改进方法制备的石墨烯在有机溶剂中具有良好的分散性和稳定性，无需添加任何稳定剂或改性剂，这归因于石墨烯的完全剥离和规则结构。此外，循环伏安和电化学阻抗测试表明，改进方法制备的石墨烯具有上级电化学性能。
Chemical exfoliation is one of the most important strategies for preparing graphene. The aggregation of graphene sheets severely prevents graphene from exhibiting excellent properties. However, there are no attempts to investigate the effect of preparation methods on the dispersity of graphene sheets. In this study, three chemical exfoliation methods, including Hummers method, modified Hummers method, and improved method, were used to prepare graphene sheets. The influence of preparation methods on the structure, dispersion stability in organic solvents, and electrochemical properties of graphene sheets were investigated. Fourier transform infrared microscopy, Raman spectra, transmission electron microscopy, and UV-vis spectrophotometry were employed to analyze the structure of the as-prepared graphene sheets. The results showed that graphene prepared by improved method exhibits excellent dispersity and stability in organic solvents without any additional stabilizer or modifier, which is attributed to the completely exfoliation and regular structure. Moreover, cyclic voltammetric and electrochemical impedance spectroscopy measurements showed that graphene prepared by improved method exhibits superior electrochemical properties than that prepared by the other two methods.