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无机材料学报

无机材料学报 ›› 2022, Vol. 37 ›› Issue (8): 883-890.DOI: 10.15541/jim20220097

所属专题： 【能源环境】金属有机框架材料

• 研究论文 • 上一篇    下一篇

基于Cu3(HHTP)2薄膜的离子液体电致变色电极

张笑宇(), 刘永盛, 李然, 李耀刚, 张青红, 侯成义, 李克睿(), 王宏志()   

  1. 东华大学 材料科学与工程学院, 纤维材料改性国家重点实验室, 上海 201620
  • 收稿日期:2022-02-28 修回日期:2022-05-31 出版日期:2022-08-20 网络出版日期:2022-06-03
  • 通讯作者: 王宏志, 教授. E-mail: wanghz@dhu.edu.cn;
    李克睿, 教授. E-mail: likr@dhu.edu.cn
  • 作者简介:张笑宇(1998-), 男, 硕士研究生. E-mail: dhuzxyu@163.com
  • 基金资助:
    国家自然科学基金(51972054)

Cu3(HHTP)2 Film-based Ionic-liquid Electrochromic Electrode

ZHANG Xiaoyu(), LIU Yongsheng, LI Ran, LI Yaogang, ZHANG Qinghong, HOU Chengyi, LI Kerui(), WANG Hongzhi()   

  1. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China
  • Received:2022-02-28 Revised:2022-05-31 Published:2022-08-20 Online:2022-06-03
  • Contact: WANG Hongzhi, professor. E-mail: wanghz@dhu.edu.cn;
    LI Kerui, professor. E-mail: likr@dhu.edu.cn
  • About author:ZHANG Xiaoyu(1998-), male, Master candidate. E-mail: dhuzxyu@163.com
  • Supported by:
    National Natural Science Foundation of China(51972054)

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摘要：

室温离子液体具有宽电化学窗口和良好的环境稳定性, 是电致变色器件的理想电解质。然而传统电致变色材料的晶格间隙较窄, 限制了离子液体中大尺寸离子的扩散, 且大离子反复脱/嵌会破坏传统电致变色材料的结构, 导致性能衰减。金属有机框架材料(MOFs)是一种具有拓扑结构的多孔晶态材料, 有望为离子液体中大尺寸离子的传输提供通道。本工作在导电玻璃表面制备了三亚苯类Cu3(HHTP)2 (HHTP=2,3,6,7,10,11-六羟基三苯并菲) MOF薄膜, 并研究了Cu3(HHTP)2薄膜在离子液体电解质中电化学和电致变色行为和性能。结果表明, 相对于传统的LiClO4/PC和NaClO4/PC电解质, Cu3(HHTP)2薄膜在离子液体[EMIm]BF4中表现出更低的接触电阻和更高的离子扩散效率, 电极的着色/褪色速度得到了显著提高(着色时间由10.3 s缩短至8.0 s, 褪色时间由23.6 s缩短至5.2 s)。同时, Cu3(HHTP)2薄膜在[EMIm]BF4中也具有更高的光调制范围和着色效率。这项工作展现出MOFs/离子液体电化学体系在电致变色领域中的潜在应用价值。

关键词: 金属有机框架材料, 薄膜, 离子液体, 电致变色

Abstract:

Room temperature ionic liquid shows wide electrochemical windows and good environmental stability, which is expected as an ideal electrolyte for electrochromic devices. However, the small crystal spacing of traditional electrochromic materials limits the diffusion of large ions in ionic liquid. Repeated deintercalation/ intercalation of large ions could also destroy the structure of traditional electrochromic materials, resulting in performance degradation. Metal-organic frameworks (MOFs) are topologically porous materials with a large intrinsic nano to microporous structure in crystalline, which are expected to provide channels for transporting large-sized ions in ionic liquids. In present work, triphenylene-based MOFs Cu3(HHTP)2 films were prepared on the surface of the conductive glass. Electrochemical and electrochromic behavior of Cu3(HHTP)2 films were studied in traditional propylene carbonate (PC)-based electrolyte and ionic liquid-based electrolytes. The results show that, compared with the traditional LiClO4/PC or NaClO4/PC electrolyte, Cu3(HHTP)2 film displays low contact resistance and high ion diffusion efficiency in the ionic liquid [EMIm]BF4 electrolyte. Switch speed of the electrochromic electrode is significantly improved with coloring time being reduced from 10.3 s to 8.0 s, and bleaching time being reduced from 23.6 s to 5.2 s. Meanwhile, Cu3(HHTP)2/[EMIm]BF4 electrochromic system also shows a larger light modulation range and coloring efficiency. This work demonstrates the potential of MOFs/ionic liquid electrochemical system in the field of electrochromic device.

Key words: MOFs, film, ionic liquid, electrochromism

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