论文总字数：10037字
摘 要
2/NG)复合材料，并考察了各因素对复合材料结构和形貌的影响。研究表明，在PH=9，T=160 0C，反应时长为4h，且钴离子负载量为0.2g情况下，制得的Co(OH)2/NG复合物中，Co(OH)2粒子分散均匀，形貌规整。在此基础上，将其超级电容器电极材料，电化学性能测试表明，上述条件下制备的Co(OH)2/NG复合物具有较大的比电容(73F/g)，且稳定性良好。关 键 词：掺氮石墨烯，氢氧化钴，复合材料，超级电容器，电化学性质
Abstract: Transition metal hydroxide materials have unique structure and good activity, so they can be used as electrode materials for supercapacitors to replace precious metal oxides. When transition metal hydroxide and graphene are made into composites, the higher electrochemical performance of the former and the better cycling property of the latter can be obtained by fully combining the electrochemical properties of the former and the latter, and the specific energy properties of the composites can be obtained. In this paper, graphite oxide prepared by modified Hummers method was employed to prepare nitrogen doped graphene-cobalt hydroxide Co(OH)2/NG composite by one-step hydrothermal method. The effects of different cobalt ion loading amount, temperature and reaction time on the crystallinity and morphology of the composites were investigated. The results show that when the reaction time is 4 h and the loading amount of cobalt ion is 0.2 g, the particles of Co(OH)2 in the Co(OH)2/NG are dispersed uniformly and the morphology is regular. Based on synthesis, the nanocomposites as electrode material for supercapacitors were investigated by cyclic voltammetry, constant current charge and discharge. The results show that the specific capacitance of Co(OH)2/NG prepared by solvothermal method under the reaction time of 4 h is larger than that of 73F/g.
Keywords: nitrogen doped graphene, cobalt hydroxide, composites, supercapacitor, electrochemical performance
目 录
1前言 4
1.1石墨烯及氧化石墨的简介 4
1.1.1石墨烯简介 4
1.1.2氧化石墨烯的简介 5
1.2超级电容器的简介 5
1.2.1超级电容器分类 5
1.3论文选题目的 6
2 氧化石墨及掺氮石墨烯-Co(OH)2纳米复合材料的制备 6
2.1实验部分 6
2.1.1实验仪器和试剂 6
2.1.2产品表征方法 7
2.2 氧化石墨的制备 7
2.3 掺氮石墨烯-Co(OH)2复合材料的制备及表征 8
2.3.1 制备方法 8
2.3.2 复合材料的X射线衍射分析 8
2.3.3复合材料的扫描电子显微镜(SEM)分析 9
3 Co(OH)2/NG复合电极材料的制备及其电化学性能测试 11
3.1 复合材料的电化学性能表征 11
3.1.1 CV测试 11
3.1.2 GCD测试 11
3.1.3 EIS测试 11
3.2 工作电极的制备 11
3.2.1实验方法 11
3.3 复合材料的表征及结果 12
3.3.1充放电性能 12
3.3.2 循环伏安特性 14
3.3.3 交流阻抗谱特征 15
结 论 17
参考文献 18
致谢 19
1前言
1.1石墨烯及氧化石墨的简介
1.1.1石墨烯简介
(1)石墨烯的结构和性质
图1.1.1石墨烯的结构示意图
石墨烯是由单层碳原子按六边形晶格整齐排布成的二维碳纳米材料，每个碳原子以sp2杂化的方式与相邻3个碳原子相连，剩余的电子在垂直于石墨烯二维平面的方向上排列，相互叠加形成离域π键[11]。在二维材料中，石墨烯厚度最薄仅为0.35nm,硬度也最高。石墨烯已被用于吸附[6]、纳米复合材料[7]、气体传感器[8]、储能装置[9]等诸多领域。
(2)石墨烯的制备方法
石墨烯的制备方法大体分为下列几种：
1. 机械剥离法；
2. SiC外延生长发；
3. 化学气相沉积法；
4. 化学氧化还原法；
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