Electrochromic Nanocomposites with Endured Energy Storage Properties
Recently, electrically conductive polymers (CPs) have received intensive attention owing to their high pseudocapacitances arising from the rich redox reactions and the corresponding color switching, as well as their facile preparation, environmental stability, high electrical conductivity, and low cost, which make them promising candidates for both energy storage and electrochromic applications. However, structural degradation as a result of the swelling/shrinkage during the intercalation/deintercalation of counterions in the redox reactions remains a challenge for pure CPs thin films. Targeting to achieve stable conductive polymer nanocomposite thin films with desirable energy storage and electrochromic properties, polyaniline nanocomposite thin films incorporated with different nanofillers, i.e., tungsten oxide and graphite oxides have been prepared by in-situ electropolymerization of the monomers onto the nanofiller coated ITO glass. These nanocomposite thin films have demonstrated much more enhanced stability due to the interactions between the polymer matrix and the nanofillers, which help buffer the stress developed in the polymer matrix. Meanwhile, the nanocomposites exhibit multi-color electrochromism at different potentials, high color contrast, fast switching speed, and high energy efficiency while possessing significant energy storage properties in terms of high energy densities and power densities.
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