Abstract
? 2022 Elsevier B.V.Recently, with the increasing number of electronic devices and electric vehicles, supercapacitors have been investigated as high-performance energy storage devices. However, most electrodes fabricated with inactive additives (binder and conductive agent) have a problem with dead mass in the electrodes, which limits the application of lightweight energy storage devices. Herein, poly[3,4-ethylenedioxythiophene] nanowires (PEDOT NWs)/Cobalt hexacyanoferrate nanoparticles (CoHCF NPs) free-standing films (PCF films) were prepared using a vacuum-assisted filtration process. The PEDOT NWs acted not only as active materials but also as conductive substrates and provide numerous sites for the CoHCF NPs to achieve enriched redox reactions. The as-prepared free-standing PCF-4 electrode displays a high areal capacity of 386.4 μA h cm?2 at a current density of 1 mA cm?2 and the long-term stability in 1 M Na2SO4 electrolyte. The fabricated quasi-solid-state asymmetric capacitor (PCF-4//activated carbon) shows a high energy density of 0.126 mW h cm?2 and power density of 0.82 mW cm?2.
NSTL
Elsevier