共轭碳纳米材料结构调控及其储能应用研究
发布时间：2019-05-23 10:27
【摘要】：碳纳米材料是近年来材料领域中广受关注的一类新型材料，包括碳纳米管、石墨烯等。本文以具有共轭碳-碳本征结构的碳纳米管、石墨烯及石墨烯量子点等为起始物，借助电化学等方法对其进行表面改性、组装，制备了缺陷碳纳米管、石墨烯纳米球并基于此结构实现了其在电容器等方面的应用。研究成果如下： 1.借助电化学循环伏安法(CV),在超长碳纳米管表面引入含氧官能团及物理缺陷，为电化学过程提供丰富活性位点。这一简便方法不仅改善碳纳米管的疏水性，而且表现出比未处理的碳纳米管高10倍的电容量。证明电化学方法可作为一种高效的活化碳纳米管表面活性的方法。 2.基于缺陷碳纳米管阵列，采用电化学沉积法，构建了碳纳米管/聚吡咯复合纳米结构。缺陷碳纳米管表面的缺陷为吡咯单体进入碳纳米管内部提供了通道，使得聚吡咯可以分布在碳纳米管的内壁以及外表面。复合纳米结构具有高达587F g-1的电容量。 3.为研究石墨烯量子点的组装行为，探索其在储能器件方面的应用前景，通过电化学沉积的方法，制备了石墨烯量子点/碳纳米管阵列复合物。经过电沉积后的碳纳米管表面包覆了类似碳膜的具有纳米孔洞的结构。复合物具有44mF cm-2的电容值，是未经处理的碳纳米管阵列电极的2倍。 4.为进一步研究石墨烯量子点的自组装行为，探索电化学条件下的组装过程，本文通过负电位电沉积，实现了由石墨烯量子点到石墨烯纳米球的转变。研究了纳米球的形成机理以及反应条件的影响，并初步探索了其在超级电容器方面的应用。 5.为拓展碳纳米材料在储能器件方面的应用范围，适应柔性器件的发展趋势，，本文基于激光定位还原氧化石墨烯纤维，构建了柔性单纤维集成的全纤维电容器。该纤维具备良好的柔性、电容量，并可用于可编织电子器件等。
[Abstract]:Carbon nanomaterials are a kind of new materials which have attracted much attention in the field of materials in recent years, including carbon nanotubes, graphene and so on. In this paper, carbon nanotubes with conjugated carbon-carbon intrinsic structure, graphene and graphene quantum dots as starting materials were modified and assembled by electrochemical methods to prepare defective carbon nanotubes. Graphene nanosphere and its application in capacitors are realized based on this structure. The results of the study are as follows: 1. The introduction of oxygen-containing functional groups and physical defects on the surface of ultra-long carbon nanotubes by electrochemical cyclic Voltammetric method (CV),) provides a wealth of active sites for electrochemical processes. This simple method not only improves the hydrophobicity of CNT, but also shows a capacitance of 10 times higher than that of untreated CNT. It is proved that electrochemical method can be used as an efficient method to activate the surface activity of carbon nanotubes. 2. Based on the defective carbon nanotube array, the carbon nanotube / polypyrrole composite nanostructure was constructed by electrochemical deposition. The defects on the surface of the defective carbon nanotube provide a channel for the polypyrrole monomer to enter the carbon nanotube, so that polypyrrole can be distributed on the inner wall and the outer surface of the carbon nanotube. The composite nanostructure has a capacitance of up to 587F g 鈮
本文编号：2483823
[Abstract]:Carbon nanomaterials are a kind of new materials which have attracted much attention in the field of materials in recent years, including carbon nanotubes, graphene and so on. In this paper, carbon nanotubes with conjugated carbon-carbon intrinsic structure, graphene and graphene quantum dots as starting materials were modified and assembled by electrochemical methods to prepare defective carbon nanotubes. Graphene nanosphere and its application in capacitors are realized based on this structure. The results of the study are as follows: 1. The introduction of oxygen-containing functional groups and physical defects on the surface of ultra-long carbon nanotubes by electrochemical cyclic Voltammetric method (CV),) provides a wealth of active sites for electrochemical processes. This simple method not only improves the hydrophobicity of CNT, but also shows a capacitance of 10 times higher than that of untreated CNT. It is proved that electrochemical method can be used as an efficient method to activate the surface activity of carbon nanotubes. 2. Based on the defective carbon nanotube array, the carbon nanotube / polypyrrole composite nanostructure was constructed by electrochemical deposition. The defects on the surface of the defective carbon nanotube provide a channel for the polypyrrole monomer to enter the carbon nanotube, so that polypyrrole can be distributed on the inner wall and the outer surface of the carbon nanotube. The composite nanostructure has a capacitance of up to 587F g 鈮
本文编号：2483823
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