高等学校化学学报 ›› 2015, Vol. 36 ›› Issue (9): 1838-1845.doi: 10.7503/cjcu20150146

• 高分子化学 • 上一篇    下一篇

纤维素纳米纤维基层层自组装透明柔性导电膜及其电致变色柔性超级电容器

郝红英1(), 王茜2, 邵自强2(), 杨荣杰3   

  1. 1. 北京科技大学土木与环境工程学院, 北京 100083
    2. 北京理工大学北京市纤维素及其衍生材料工程技术研究中心,3. 北京理工大学国家阻燃材料工程技术研究中心, 北京 100081
  • 收稿日期:2015-02-11 出版日期:2015-09-10 发布日期:2015-08-21
  • 作者简介:联系人简介: 郝红英, 女, 博士, 副教授, 主要从事天然高分子材料应用与环境科学研究. E-mial: hhy0822@sina.com;邵自强, 男, 博士, 教授, 主要从事天然高分子材料功能化与应用研究. E-mial: shaoziqaing@263.net
  • 基金资助:
    北京市科技计划项目(批准号: 2015-010)资助

Transparent Flexible Conductive Thin Films Based on Cellulose Nanofibers by Layer-by-layer Assembly Method and Its Fabricated Electrochromic Flexible Supercapacitors

HAO Hongying1,*(), WANG Xi2, SHAO Ziqiang2,*(), YANG Rongjie3   

  1. 1. School of Civil and Environmental Engineering , University of Science & Technology Beijing, Beijing 100083, China
    2. Beijing Engineering Research Center of Cellulose and Its Derivatives, Beijing Institute of Technology,3. National Engineering Research Center of Flame Retardant Materials, Beijing Institute of Technology, Beijing 100081, China
  • Received:2015-02-11 Online:2015-09-10 Published:2015-08-21
  • Contact: HAO Hongying,SHAO Ziqiang E-mail:hhy0822@sina.com;shaoziqaing@263.net

摘要:

以纤维素纳米纤维(CNFs)膜为基材, 通过层层自组装法设计并制备了CNFs/[Cu2+-GO]5/[PANI-PEDOT∶PSS]10复合膜(CGPP膜), 经过除铜, 将氧化石墨烯(GO)还原为还原氧化石墨烯(RGO), 得到CNFs/RGO5/[PANI-PEDOT∶PSS]10复合导电膜(CRGPP-10膜), 并以H2SO4-PVA凝胶为电解质, 双片CRGPP-10膜为电极, 组装了双电极体系的柔性超级电容器S-RGPP. 对CGPP膜和CRGPP-10膜进行紫外-可见光谱、 结晶特性和形态表征, 并对S-RGPP的循环伏安(CV)曲线、 恒电流充放电性能(GCD)及电化学阻抗谱(EIS)等电化学性能进行分析. 结果表明, 通过层层自组装法制备的CRGPP-10膜具有均匀和透明度可控的优点. 柔性超级电容器S-RGPP的内阻较小, 同时具有双电层(EDL)电容和赝电容性能, 表现出良好的柔性和一定的电致变色性. RGO的加入使S-RGPP的循环稳定性得到改善.

关键词: 纤维素纳米纤维, 还原氧化石墨烯, 层层自组装, 电致变色性, 柔性超级电容器

Abstract:

The cellulose nanofibers(CNFs) film exhibit high visible light transmittance, high mechanical strength, and excellent flexibility. Therefore, CNFs film may be an excellent substrate material for flexible transparent electronic devices. In this paper, we endeavor to prepare the CNFs-based hybrid multilayer thin film CNFs/[Cu2+-GO]5/[PANI-PEDOT∶PSS]10 by layer-by-layer assembly method using divalent copper ions(Cu2+) as the crosslinking agent. Then the conductive thin film of CRGPP-10 was got by removing copper ions with solution and using reduction reaction of graphene oxide(GO) with hydroiodic acid solution for reduction of oxide graphene(RGO) from CNFs/[Cu2+-GO]5/[PANI-PEDOT∶PSS]10 film. After that, the supercapacitor fabricated S-RGPP was fabricated using double CRGPP-10 films as electrode when H2SO4-PVA gel was used as the electrolyte. The crystalline characteristic and configuration of CRGPP thin films, along with the absorbency characteristics of CRGPP thin films, were analyzed. Meanwhile, the electrochemical characters of the supercapacitor S-RGPP were tested, such as cyclic vollammetry(CV) curves, galvanostatic charge-discharge(GCD) and electrochemical impedance spectroscopy(EIS). The results indicated that the method of the flexible electrochromic film with layer-by-layer assembly method is practicable. The conducting film CRGPP-10 was uniform with controlled transparency. The supercapacitor S-RGPP exhibits an excellent areal capa-citance of 8.15 mF/cm2 at a current density of 0.0043 mA/cm2. Owing to the addition of RGO reagent, the cycle stability of supercapacitor S-PGPP improved, which is fabricated by CPRPP-10 electrodes. The device exhibited good electrochemical performance, such as the characters of the low resistance, with the capacitive behavior of the electrical double-layer capacitor(EDL) capacitor and pseudo capacitor at the same time. Meanwhile, it showed so better flexible that there was no difference between normal and bent state. The device shows some electrochromism. This study provides a novel method using CNFs as substrate to prepare hybrid electrodes for future flexible supercapacitors.

Key words: Cellulose nanofibers(CNFs), Reduced graphene oxide(RGO), Layer-by-layer assembly method, Electrochromism, Flexible supercapacitor

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