Synergies of vertical graphene and manganese dioxide in enhancing the energy density of carbon fibre-based structural supercapacitors

Zhao Sha, Feng Huang, Yang Zhou, Jin Zhang, Shuying Wu, Junyan Chen, Sonya A. Brown, Shuhua Peng, Zhaojun Han, Chun-Hui Wang*

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

Structural supercapacitor is a promising solution for reducing the overall weight of electric vehicles. To maximum the energy storage capacity of a load-carrying structure, we present a technique to create carbon fibre (CF) electrodes modified with vertical graphene (VG) and manganese dioxide (MnO2). The results show that the hybridisation of VG and MnO2 generates a significant synergistic effect in increasing the areal capacitance of electrode. This synergistic effect is attributed to the dual effects of VG in increasing effective surface area and the electrical conductivity, which enable a better distribution of MnO2 as well as a highly conductive network. A structural supercapacitor, based on the CF/VG/MnO2 hybrid electrode and a polymer electrolyte, exhibits an areal capacitance of 30.7 mF/cm2, energy density of 12.2 mW h/kg, and power density of 2210.3 mW/kg. Moreover, mechanical characterisations demonstrate a tensile strength of 86 MPa and a flexural strength of 32 MPa for this structural supercapacitor. The high electrical energy density and mechanical properties of this supercapacitor pave a way of developing advanced carbon fibre multifunctional composites with excellent structural performance and energy storage capability.

Original languageEnglish
Article number108568
Pages (from-to)1-10
Number of pages10
JournalComposites Science and Technology
Volume201
DOIs
Publication statusPublished - 5 Jan 2021

Keywords

  • Structural supercapacitor
  • Vertical graphene
  • Manganese dioxide
  • Synergistic effect
  • Multifunctional composites

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