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Cellulose Aluminium Polymer multi-ions composite Solid-electrolyte
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3D Printed Graphene Based Supercapacitors
Publication . Costa, Guilherme Cadete Paixão da; Ferreira, Isabel
This thesis aims to develop graphene-based supercapacitors. There is an emerging
interest in the development of lightweight, high capacity and high durability supercapacitors.
As the electronic equipment are getting lighter and lighter but simultaneously
requiring more power supply, the energy density of batteries and/or supercapacitors
should respond to this demand. Therefore, graphene-based supercapacitors have been
investigated as potential material for high capacity power sources. The graphene is a very
light material and has a huge surface area together with high conductivity, thus it is ideal
for charge accumulation.
In this work graphene was obtained by electrochemical exfoliation as a greener
and harmless technique when compared to Hummer’s method. Two rods of graphite we
used as electrodes for electrochemical exfoliation in a bath of H2SO4 , being studied the
influence of acid concentration and applied potential on the graphite/graphene powder
quality. That was evaluated by XRD, SEM and micro Raman spectroscopy.
The obtained graphene-oxide powder was mixed with a polymeric binder agent
and then used to print electrodes. The conductive of electrodes was optimized with a
thermal treatment around 350ºC in different atmospheres. The performances of supercapacitors
were tested for two different geometries, vertical (sandwich type) and planar
(inter-digital configuration). These devices were studied for their stability and capacitance
by CV curves and electrochemical impedance spectroscopy.
This work proves that it is possible to use graphene-oxide powder, produced via
electrochemical exfoliation, to make 3D printable inks for supercapacitors applications.
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Entidade financiadora
European Commission
Programa de financiamento
H2020
Número da atribuição
825018