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Plasma functionalisation of few-layer graphenes and carbon nanotubes for graphene microsupercapacitors

Smith, Emily A. M., Liu, Yuqing, Stirling, Chris, Watson, David J., Slade, Robert C. T., Chen, Jun and Crean, Carol (2019) Plasma functionalisation of few-layer graphenes and carbon nanotubes for graphene microsupercapacitors Electrochimica Acta.

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Abstract

Plasma processing, as a commercial and large-scale technology, was used to functionalize few-layer graphene (FLG) and multi-walled carbon nanotubes (MWCNT) in this work. The successful functionalities of FLG and MWCNT have been confirmed by elemental microanalysis, X-ray photoelectron spectroscopy, acid-base titration and zeta potential measurements. With the assistance of poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT/PSS), a water-dispersible and conductive polymer, a composite of functionalized FLG and MWCNT was fabricated into large-size flexible films and also interdigitated microelectrodes for microsupercapacitor application via simple and scalable techniques (i.e. doctor blading and laser-etching). When normalised by volume and area, the device made from FLG(NH3)-MWCNT(Acid) (19.9 F cm-3 at 5 mV s-1 and 12.2 F cm-3 at 200 mV s-1) and FLG-MWCNT(Acid) (19.5 mF cm-2 at 5 mV s-1 and 12.8 mF cm-2 at 200 mV s-1) show the best performing composites, respectively, indicating how effective functionalization of FLG and MWCNT is for the enhancement of electrochemical capacitance. In-situ Raman microscopy confirmed the reversible pseudo-capacitive behaviour of electrode materials and the stable electrochemical performance of the devices. The facile techniques used in this work and the good device performance show their great potential for wearable applications.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Chemistry
Authors :
NameEmailORCID
Smith, Emily A. M.e.a.smith@surrey.ac.uk
Liu, Yuqing
Stirling, Chris
Watson, David J.D.J.Watson@surrey.ac.uk
Slade, Robert C. T.R.Slade@surrey.ac.uk
Chen, Jun
Crean, Carolc.crean@surrey.ac.uk
Date : 2019
Funders : Engineering and Physical Sciences Research Council (EPSRC), University of Surrey, Science and Technology Facilities Council (STFC), Royal Society of Chemistry
Copyright Disclaimer : © 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Related URLs :
Depositing User : Clive Harris
Date Deposited : 24 May 2019 07:54
Last Modified : 13 Aug 2020 16:08
URI: http://epubs.surrey.ac.uk/id/eprint/851886

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