原位修饰石墨烯/MnO2纳米线间层复合材料的制备及其超级电容特性研究

项目名称： 原位修饰石墨烯/MnO2纳米线间层复合材料的制备及其超级电容特性研究

项目编号： No.51302239

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 一般工业技术

项目作者： 汪形艳

作者单位： 湘潭大学

项目金额： 25万元

中文摘要： 针对石墨烯作为超级电容器电极材料存在表面缺少官能团，润湿性欠佳，容易团聚，以及比电容不高等问题，本项目提出一步原位合成官能团修饰石墨烯，获得高分散的修饰石墨烯。在表面官能团的诱导下，具有高法拉第准电容的MnO2纳米线在石墨烯表面定向可控生长，制备出具有间层结构的官能团修饰石墨烯/MnO2纳米线复合材料，解决石墨烯容易团聚和比电容不高等问题。通过研究一维MnO2纳米线在石墨烯表面的生长机理及界面结合机制，探讨制备条件对材料结构、形貌及电化学性能的影响，揭示材料结构与电化学性能之间的内在关系，阐明原位修饰改善材料性能的机理，建立石墨烯双电层电容-MnO2法拉第准电容性能耦合机制，从而获得性能优良的石墨烯/MnO2复合材料并应用于高性能超级电容器。同时，为其它超级电容器用高性能石墨烯/金属氧化物复合材料制备提供理论基础及技术依据，推动我国石墨烯电容器用高性能电极材料制备技术及其应用水平的发展。

中文关键词： 超级电容器；石墨烯；二氧化锰；复合材料；气凝胶

英文摘要： Aiming at the problem of graphene as electrode material for supercapacitor, easy to agglomerate resulting in the lack of surface functional groups and poor wettability, and pure graphene supercapacitors possess inferior specific capacitance, one-step method has been carried out to synthesis disperse graphene modified by functional group in situ in this proposal. MnO2 nanowire arrays with high Faradaic pseudo-capacitance are directly grew on the surface of graphene in the induction of surface functional groups. Surface modified graphene/MnO2 nanowires composites with interlayer structure can resolve the problem of agglomeration and lower specific capacitance of the pure graphene. The relationship between structure，morphology and electrochemical properties is investigated through studying the growth mechanism of one-dimensional MnO2 on graphene and interfacial bonding mechanism. The optimization principle of performance by modifing in situ and the coupling mechanism of double layer capacitance of graphene and Faradaic pseudo-capacitance of MnO2 are investigated, so the graphene/MnO2 composite materials with excellent performance for supercapacitor is obtained. This proposal will provide a theoretical basis and experimental guidance for the preparation of graphene/metal oxide composite materials with good electroch

英文关键词： supercapacitor；graphene；manganese dioxide；composite；aerogels