高等学校化学学报2024，Vol.45Issue(1)：132-142,11.DOI:10.7503/cjcu20230410
磷酸在GO插层阶段的功能化调控及机理
Functional Regulation and Mechanism of Phosphoric Acid in GO Intercalation Stage
摘要
Abstract
The research on the regulation and mechanism of the intercalation stage in the preparation of graphene oxide(GO)is of great significance for the functionalization of GO and its application in electrode materials.On the basis of the improved Hummers method,different volumes of H3PO4 were added to the H2SO4 intercalation agent to prepare GO with different oxidation degrees.Scanning electron microscopy(SEM),X-ray photoelectron spectroscopy(XPS),Fourier transform infrared spectroscopy(FTIR)and other characterization methods were used to analyze the microstructure,elemental composition and oxidation degree of different GO to explore the mechanism of H3PO4 in the process of intercalation of graphite.The electrochemical properties of GO under different volumes of H3PO4 were tested by cyclic voltammetry(CV)and electrochemical impedance spectroscopy(EIS).The effect of H3PO4 on the electrochemical properties of GO was analyzed to achieve the purpose of improving the conductivity of GO by regulating the intercalation oxidation of graphite.The results show that the single H2SO4 causes the excessive oxidation of the ortho-diol on the GO base surface to cause holes.The addition of H3PO4 will expand the graphite layer spacing and make the oxidant easier to enter the graphite layer and react with 1,2-diol to form a ring structure to protect the base surface,thereby improving the conductivity of GO.As an auxiliary acid,H3PO4 will assist H2SO4 to prepare GO with more complete base surface and higher oxidation degree,but its acidity is weak and cannot completely replace the role of H2SO4 in the oxidation process.The research results provide experimental support and theoretical support for the subsequent development of functionalized GO and its application in energy storage.关键词
氧化石墨烯/磷酸插层/机理研究/电化学/化学反应/部分氧化Key words
Graphene oxide/Phosphoric acid intercalation/Mechanism research/Electrochemistry/Chemical reaction/Partial oxidation分类
化学化工引用本文复制引用
王佳瑞,李春丽,程佳豪,郝亚玲,周楠,杨鹏..磷酸在GO插层阶段的功能化调控及机理[J].高等学校化学学报,2024,45(1):132-142,11.基金项目
内蒙古自然科学基金(批准号:2023LHMS05020)和自治区直属高校基本科研业务费项目(批准号:JY20220042)资助.Supported by the Inner Mongolia Natural Science Foundation,China(No.2023LHMS05020)and the Basic Scientific Research Business Fee Project of Universities Directly Under the Autonomous Region,China(No.JY20220042). （批准号:2023LHMS05020）
