摘要：超级电容器近年作为一种储能器件近年来被研究关注的比较多，它的优点是循环寿命很高，而且功率密度也比较大，但充放电时间比较短。本论文中，采取了水热法制备了石墨烯/四氧化三钴复合材料，并考察了二者不同浓度下电化学性能的变化。利用了X-射线衍射，扫描电子显微镜等来进行表征，石墨烯是层状结构的的，通过复合后发现石墨烯和四氧化三钴二者的团聚性减小，球状四氧化三钴能均匀分散在石墨烯的表面，有利于提高材料性能。接着进行了一系列的电化学测试，在循环伏安测试时发现当石墨烯和四氧化三钴的配比比例为1：5的时候，该材料的性能最好，在20mv/s的扫描速率下围成面积最大，也就是比电容最大。在恒电流充放电中，二者浓度为1:5的复合材料的在0.25A·g-1电流密度下电极比容量可达98.5F·g-1，并且经过1000次循环试验后仍然保持着良好的循环稳定性。71809

毕业论文关键词：超级电容器；电极材料；四氧化三钴；水热法；电化学性能

Self-assembly of graphene/Co3O4 Composites and Its Supercapacitor Performance

Abstract: Supercapacitor is a new kind of energy storage device, it has good power density, good cycle life, short charge and discharge time. The advantages and disadvantages of the electrode material determines the development of super capacitor is good or bad. Recently, Looking at the recent literature we can see that the recent development of metal oxide / carbon composites supercapacitors has become increasingly fast, and the content on this aspect of research is so numerous.Cobalt tetroxide is cheap but its theoretical specific capacity can up to 3560F ∙ g-1 and is environmentally friendly, but the resistance is large, easy to agglomerate, and the cycling performance is poor, and the graphite in the carbon material Olefins have a good conductivity, specific surface area and structural stability, etc., so we want to combine the two together so that they learn from each other, thereby improving the performance of the material. The study of graphene / tetroxide cobalt oxide as a supercapacitor electrode material has been Some research results. From the current literature reports, hydrothermal preparation of graphene / cobalt oxide composite electrode material is undoubtedly relative to other methods show more excellent electrochemical performance.

Keywords: supercapacitor; electrode material; tri-cobalt oxide; hydrothermal method; electrochemical performance

目录

1 绪论 1

1.1 引言 1

1.2 超级电容器 1

1.2.1 超级电容器概述 1

1.2.2 超级电容器的分类及原理 1

1.3四氧化三钴超级电容器 3

1.3.1 四氧化三钴超级电容器的进展 3

1.3.2 制备方法 3

1.3.3 改性 4

1.4 氧化钴/石墨烯材料进展 5

1.5 选题思路 6

2 实验部分 7

2.1 实验原材料 7

2.2 实验仪器 7

2.3 实验步骤 8

2.3.1 石墨烯/四氧化三钴材料制备 8

2.3.2 电极材料制备 8

2.4 拟采用的方案论证方法 9

2.4.1 透射电镜和扫描电镜分析