摘要石墨烯具有大的比表面积和良好的导电性，将四氧化三钴和二氧化锰负载在石墨烯上并形成水凝胶，可显著抑制纳米粒子的团聚现象，降低电化学体系阻抗，有效提高材料电化学性能。本论文采用冷凝回流法先将二氧化锰负载在石墨烯上，再用水热法对四氧化三钴进行复合负载，形成复合水凝胶。利用XRD、TEM等手段对复合物水凝胶进行了结构表征，并对其电化学性能进行了研究。结果表明，通过冷凝回流、水热合成法可以成功制备出石墨烯表面均匀负载二氧化锰和四氧化三钴水凝胶复合物。研究发现，控制反应参数（负载比），复合物水凝胶的电化学性能随之改变。在石墨烯-二氧化锰-四氧化三钴三者投料比为1:0.45:0.5，扫描速率为0.01V/s时测得最大比电容为972.1 F/g。高的比电容使制得的四氧化三钴/二氧化锰/石墨烯水凝胶复合材料有望作为超级电容器的电极材料。63752

毕业论文关键词  石墨烯 二氧化锰 四氧化三钴  水凝胶  电化学性能  比电容  超级电容器

毕业设计说明书（论文）外文摘要

Title  The synthesis of Co3O4/MnO2/Graphene composite hydrogels and their properties

Abstract Graphene has a large specific surface area and good conductivity. Anchoring MnO2    and Co3O4 on graphene sheets into hydrogels could significantly inhibit the nanoparticles agglomeration in the electrochemical cycle and reduce the electrochemical system impedance, which could effectively improve the material performance. In this paper, firstly, reflux condensation method was used to prepare the graphene-MnO2 composite and then hydrothermal method was used to prepare the graphene-MnO2-Co3O4, as a result, they formed the nanocomposite hydrogel. The microstructure of obtained composite was investigated by XRD、TEM and other methods, and its electrochemical properties were also studied. The results show that using the hydrothermal method could uniformly load MnO2 and Co3O4 to the graphene sheets and form a composite. With the reaction parameters (raw material’s ratio) changed, the electrochemical properties of the hydrogels change afterwards. The graphene-MnO2-Co3O4 exhibits a high specific capacitance of 972.1 F/g at a scan rate of 0.01V/s and a proportion of 1:0.45:0.5. The high specific capacitance makes the obtained composite promising for electrode materials applied in supercapacitors. 

Keywords:   Graphene; MnO2; Co3O4; Hydrogel; Electrochemical Performance;   Specific capacitance; Supercapacitor 

1 绪论 1

1.1 超级电容器 1

1.2 石墨烯 2

1.3 石墨烯基复合物 4

1.4 二氧化锰电极概述 6

1.5 四氧化三钴 6

1.6 水凝胶 9

1.7   本论文的工作 10

2 二氧化锰/石墨烯的制备、表征 11

2.1   二氧化锰/石墨烯的制备 11

2.2   二氧化锰/石墨烯的表征 13

3 四氧化三钴/二氧化锰/石墨烯的制备、表征与电化学分析15

3.1   四氧化三钴/二氧化锰/石墨烯的制备 15

3.2   四氧化三钴/二氧化锰/石墨烯的表征