Optimization
of PEDOT Films in Ionic Liquid Supercapacitors: Demonstration As a
Power Source for Polymer Electrochromic Devices
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Abstract
We
report on the optimization of the capacitive behavior of poly(3,4-ethylenedioxythiophene)
(PEDOT) films as polymeric electrodes in flexible, Type I electrochemical
supercapacitors (ESCs) utilizing ionic liquid (IL) and organic gel
electrolytes. The device performance was assessed based on figures
of merit that are critical to evaluating the practical utility of
electroactive polymer ESCs. PEDOT/IL devices were found to be highly
stable over hundreds of thousands of cycles and could be reversibly
charged/discharged at scan rates between 500 mV/s and 2 V/s depending
on the polymer loading. Furthermore, these devices exhibit leakage
currents and self-discharge rates that are comparable to state of
the art electrochemical double-layer ESCs. Using an IL as device electrolyte
allowed an extension of the voltage window of Type I ESCs by 60%,
resulting in a 2.5-fold increase in the energy density obtained. The
efficacies of tjese PEDOT ESCs were assessed by using them as a power
source for a high-contrast and fast-switching electrochromic device,
demonstrating their applicability in small organic electronic-based
devices