Conjugated Microporous Polymer Network Grafted Carbon Nanotube Fibers with Tunable Redox Activity for Efficient Flexible Wearable Energy Storage

Wei Lyu, Weiyi Zhang, He Liu, Yunpeng Liu, Hongyu Zuo, Chunna Yan, Charl F J Faul, Arne Thomas, Meifang Zhu, Yaozu Liao*

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

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Abstract

Fiber-shaped supercapacitors (FSCs) are promising energy storage devices that meet the growing demands for the miniaturization, flexibility and compatibility of wearable electronics. However, when compared with batteries, the low energy density remains the main limitation to practical applications. Conjugated microporous polymer (CMP) network synthesized using Buchwald-Hartwig cross-coupling reactions, featured tailorable porous structures, reversible redox chemistry and demonstrated highly efficient capacitive performance. Herein CMP network grafted on carbon nanotube fibers (CNF@CMP) with high areal specific capacitance (671.9 mF cm-2 at a current density of 1 mA cm-2) were successfully achieved for polytriphenylamine (PTPA)-based network. All-solid-state symmetrical twisted CNF@PTPA FSCs fabricated with PVA/H3PO4 as gel electrolyte exhibited a high specific areal capacitance of 398 mF cm-2 (0.28 mA cm-2), a maximal operating voltage of 1.4 V, and an energy density of 18.33 μWh cm-2. Moreover, they showed excellent flexibility and mechanical stability retaining 84.5% of the initial capacitance after 10000 bending cycles. These materials provide a new route to high-performance wearable supercapacitors (HPWS), with wide potential applications in wearable electronics, as shown by the examples provided.
Original languageEnglish
Pages (from-to)8276 – 8285
Number of pages10
JournalChemistry of Materials
Volume32
Issue number19
Early online date12 Aug 2020
DOIs
Publication statusPublished - 13 Oct 2020

Keywords

  • Carbon nanomaterials
  • Redox reactions
  • Nanofibers
  • Fibers
  • Electrical properties

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