Abstract
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Supercapacitors are promising energy storage and power output technologies due to their improved
energy density, rapid charge-discharge cycle, high cycle efficiency and long cycle life. Free standing poly
(3,4-ethylenedioxythiophene) poly(styrene sulfonate)/single walled nanotube films have been
characterised by scanning electron microscopy, Raman spectroscopy and thermo-gravimetric analysis
to understand the physical properties of the films. Films with varying compositions of poly(3,4-
ethylenedioxythiophene)/poly(styrene sulfonate) and single walled nanotubes were compared by
electrochemical impedance spectroscopy, cyclic voltammetry and galvanostatic charge/discharge to
understand their electrochemical properties. A comparison of the results shows that having single
walled nanotubes dispersed throughout the polymer matrix increase the capacitance by 65% and the
energy density by a factor of 3 whilst achieving good capacity retention over 1000 cycles.