储能科学与技术

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电化学沉积制备MnO2/PEDOT-PSS复合材料及其电容特性研究

刘文杰1,2,孙现众2,3,郝青丽1   

  1. 1南京理工大学化工学院,江苏 南京 210094;2中国科学院电工研究所,北京 100190;3中国科学院大学,北京100049
  • 收稿日期:2018-01-02 修回日期:2018-01-24 出版日期:2018-03-01 发布日期:2018-03-01
  • 通讯作者: 郝青丽,教授,研究方向为超级电容器与传感器领域,E-mail:qinglihao@njust.edu.cn。
  • 作者简介:刘文杰(1993—),男,硕士研究生,研究方向为超级电容器与锂离子电池,E-mail:liuwenjie@mail.iee.ac.cn
  • 基金资助:
    国家自然科学基金项目(51472238,21576138)。

Electrochemical deposition of MnO2/PEDOT-PSS composite and its capacitance characteristics

LIU Wenjie1,2, SUN Xianzhong2,3, HAO Qingli1   

  1. 1School of Chemical Engineering, Nanjing University of Science & Technology, Nanjing 210094, Jiangsu, China; 2Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China; 3University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2018-01-02 Revised:2018-01-24 Online:2018-03-01 Published:2018-03-01

摘要: 通过电化学方法在泡沫镍基底上电沉积MnO2,然后在其表面原位电聚合导电高分子PEDOT-PSS,形成复合结构材料,并研究不同聚合时间包覆的导电高分子层对复合电极电化学性能的影响。采用拉曼光谱、扫描电镜和透射电子显微镜观察制备的复合材料电极的表面形貌与结构。通过电化学测试结果表明,电聚合10 s得到的PEDOT-PSS包覆的MnO2复合材料(P-MnO2-2)的比容量最高(346.5 F/g),是MnO2电极(179.1 F/g)的1.9倍,在6 A/g大电流密度下仍具有223.5 F/g的比容量,且循环稳定性比较好。最后使用KOH凝胶固态电解液,组装成柔性对称型固态超级电容器点亮一个LED灯。

关键词: MnO2, 导电高分子, 复合材料, 电沉积, 柔性超级电容器

Abstract:

MnO2 is deposited on a nickel foam substrate by using the electrodeposition method, and then the conductive polymer PEDOT-PSS is in situ polymerized on its surface, which was designed to format the composite materials. The impact of wrapped conductive polymer layer on the electrochemical properties has been studied with different polymerization time. The morphologies and structures of the composite materials have been characterized by Raman spectrum, scanning electron microscope and transmission electron microscope, respectively. The results of the electrochemical tests show that the P-MnO2-2 composite with electropolymerization for 10s has the highest specific capacity (346.5 F·g1), which is 1.9 times higher than MnO2 electrode (179.1 F·g1). The P-MnO2-2 composite still has a specific capacity of 223.5 F·g1 at the high current density of 6 A·g1. Finally, a flexible symmetrical solid-state supercapacitor has been assembled using the KOH gel-solid electrolyte to light a LED lamp.

Key words:  MnO2, conductive polymer, composite, electrodeposition, flexible supercapacitor