菜单
  

    摘 要:采用化学水热法制得纯相Co(OH)2和活性炭改性Co(OH)2(C-Co(OH)2)复合材料用于超级电容器材料。采用X射线衍射(XRD)和扫描电镜(SEM)表征了产物的结构和形貌,结果表明,150℃ 6h的水热反应条件下获得的Co(OH)2为分散度高、形貌规则的六边形薄片状;六方形的Co(OH)2薄片均匀分散在C-Co(OH)2复合材料中。采用循环伏安、恒流充放电、交流阻抗等电化学方法考察其电化学性能。结果发现C-Co(OH)2电极比Co(OH)2电极具有更加优异的电化学性能:循环伏安分析表明, C-Co(OH)2电极在0~0.6V(VS.SCE),表现出良好的矩形特征;在0~0.6v充放电电位区间、0.1A/g电流密度下研究其充放电性能,发现当C与Co的质量比为16:1时电容器的充放电性能良好,比容量和储能密度均达到最大,分别为151.33F·g-1,储能密度为0.0174Wh·kg-1,在充放电100次后,C-Co(OH)2的比容量没有衰减,说明产物具有较好的电化学稳定性,有望成为超级电容器的电极材料。54283

    毕业论文关键词:超级电容器,Co(OH)2,活性炭,循环伏安,充放电,比电容

    Abstract:Co(OH)2 and Activated carbon (C) modified Co(OH)2 (C-Co(OH)2) used as electrode materials for supercapacitors were synthesized by hydro-thermal method under 150oC for 6h. The structure of the products was characterized using X-ray diffraction (XRD) and scanning electron microscope (SEM). It was found that Co(OH)2 presented as Hexagonal sheet-like structure with high dispersibility and it was uniformly dispered in active carbon. The electrochemical performances of the obtained products are investigated by cyclic voltammetry(CV), constant current charge/discharge and electrochemical impedance spectroscopy (ESR) techniques. The tests found that C-Co(OH)2 presents better electrochemical property than that of pure Co(OH)2.Based on Cyclic voltammograms (vs.SCE), the working voltage for C-Co(OH)2 composites with ideal capacitor behavior were 0V-0.6 V respectively in 0.5mol·L- 1 Na2SO4. Charge and discharge behavior of the products between 0~0.6Vunder different current densities were studied, the results show that the optimum current density is 0.1 A • g-1. Under this condition, the specific capacity and energy density reached the maximum. The specific capacity was 151.33F • g-1, energy density is 0.0174Wh • kg-1, respectively. After the 100 charge and discharge cycles, capacity of C-Co(OH)2 almost maintain the same as original, indicating  C-Co(OH)2 has better electrochemical stability, which is expected to be used as the supercapacitor electrode material.

    Keywords: Supercapacito, C-Co(OH)2, Cyclic voltamper, Specific capacitance

    目   录

    1.  前言 4

    1.1  超级电容器的简介 4

    1.2  超级电容器的原理和分类 4

    1.3  超级电容器的特点及应用 4

    1.4 超级电容器的电极材料 4

    2  实验部分 5

    2.1  仪器和试剂 5

    2.2  Co(OH)2与C-Co(OH)2复合材料的制备 5

    2.3  材料表征 5

    2.3.1  粉末X射线衍射 6

    2.3.2  扫射电镜形貌分析 6

    2.4  电极材料的制备 6

    2.5  电化学测试方法 6

    3  结果与讨论 6

    3.1  XRD分析 6

    3.2  扫射电镜图形

  1. 上一篇:理论与实验研究2-丙硫醇氧化
  2. 下一篇:氯化钙和水杨酸复配处理对干旱胁迫下小麦幼苗生长的影响
  1. WnCu团簇的结构和性能研究

  2. 栗壳吸附质生物质活性炭的制备与应用

  3. WO3-PbO2/C混合电容器的组装及性能研究

  4. 含钛高炉渣钛的资源化回收利用研究

  5. 常见阻垢剂与钢厂循环水...

  6. 铁酸钡复合物制备及应用

  7. 生物降解食品保鲜膜的制备与应用研究

  8. 高警觉工作人群的元情绪...

  9. 浅析中国古代宗法制度

  10. 现代简约美式风格在室内家装中的运用

  11. 中国传统元素在游戏角色...

  12. g-C3N4光催化剂的制备和光催化性能研究

  13. C++最短路径算法研究和程序设计

  14. 江苏省某高中学生体质现状的调查研究

  15. NFC协议物理层的软件实现+文献综述

  16. 上市公司股权结构对经营绩效的影响研究

  17. 巴金《激流三部曲》高觉新的悲剧命运

  

About

优尔论文网手机版...

主页:http://www.youerw.com

关闭返回