title: Preparation of Supercapacitors on Flexible Substrates with Electrodeposited PEDOT/Graphene Composites.
abstract: Composite films consisting of poly(3,4-ethylenedioxythiophene) (PEDOT) and graphene oxide (GO) were electrochemically polymerized by electrooxidation of EDOT in ionic liquid (BMIMBF4) onto flexible electrode substrates. Two polymerization approaches were compared, and the cyclic voltammetry (CV) method was found to be superior to potentiostatic polymerization for the growth of PEDOT/GO films. After deposition, incorporated GO was reduced to rGO by a rapid electrochemical method of repetitive cathodic potential cycling, without using any reducing reagents. The films were characterized in 3-electrode configuration in BMIMBF4. Symmetric supercapacitors with aqueous electrolyte were assembled from the composite films and characterized through cyclic voltammetry and galvanostatic discharge tests. It was shown that PEDOT/rGO composites have better capacitive properties than pure PEDOT or the unreduced composite film. The cycling stability of the supercapacitors was also tested, and the results indicate that the specific capacitance still retains well over 90% of the initial value after 2000 consecutive charging/discharging cycles. The supercapacitors were demonstrated as energy storages in a room light energy harvester with a printed organic solar cell and printed electrochromic display. The results are promising for the development of energy-autonomous, low-power, and disposable electronics.
authors.forename: Suvi
authors.initials: S
authors.lastname: Lehtimäki
authors.affiliation: Turku University Centre for Materials and Surfaces (MATSURF), Laboratory of Materials Chemistry and Chemical Analysis, University of Turku , 20014 Turun yliopisto, Finland.
authors.forename: Milla
authors.initials: M
authors.lastname: Suominen
authors.affiliation: Turku University Centre for Materials and Surfaces (MATSURF), Laboratory of Materials Chemistry and Chemical Analysis, University of Turku , 20014 Turun yliopisto, Finland.
authors.forename: Pia
authors.initials: P
authors.lastname: Damlin
authors.forename: Sampo
authors.initials: S
authors.lastname: Tuukkanen
authors.affiliation: Turku University Centre for Materials and Surfaces (MATSURF), Laboratory of Materials Chemistry and Chemical Analysis, University of Turku , 20014 Turun yliopisto, Finland.
authors.forename: Carita
authors.initials: C
authors.lastname: Kvarnström
authors.forename: Donald
authors.initials: D
authors.lastname: Lupo
keywords: PEDOT; composite; electrodeposition; energy harvester; flexible substrate; graphene; supercapacitor