Stable Deep Doping of Vapor-Phase Polymerized Poly(3,4-ethylenedioxythiophene)/Ionic Liquid Supercapacitors
Christoffer Karlsson1, James Nicholas2,3, Drew Evans2
1Nanotechnology and Functional Materials, Department of Engineering Sciences, The Ångström Laboratory, Uppsala University, Box 534, SE-751 21, Uppsala, Sweden. Christoffer.Karlsson@Angstrom.uu.se.
Chemsuschem
|June 22, 2016
Summary
Vapor-phase polymerized poly(3,4-ethylenedioxythiophene) (VPP-PEDOT) carbon paper electrodes achieve record capacitance for energy storage. These PEDOT electrodes offer high specific power and energy, combining capacitor and battery performance.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Poly(3,4-ethylenedioxythiophene) (PEDOT) is a promising conducting polymer for energy storage applications.
- Developing efficient manufacturing methods for high-performance PEDOT electrodes is crucial.
Purpose of the Study:
- To manufacture and characterize chloride- and tosylate-doped PEDOT carbon paper electrodes using liquid-solution and vapor-phase polymerization (VPP).
- To evaluate the electrochemical properties, specific capacitance, and specific charge of these electrodes in an ionic liquid electrolyte.
- To assess the performance of symmetric PEDOT supercapacitor cells for advanced energy storage.
Main Methods:
- Fabrication of PEDOT carbon paper electrodes via liquid-solution polymerization and VPP.
- Electrochemical characterization including specific capacitance and specific charge measurements.
- Assembly and testing of symmetric PEDOT supercapacitor cells using 1-ethyl-3-methylimidazolium dicyanamide (emim dca) electrolyte.
Main Results:
- VPP-PEDOT electrodes demonstrated exceptional specific capacitance exceeding 300 F/g, the highest reported for PEDOT.
- Achieved high doping levels of up to 0.7 charges per monomer in VPP-PEDOT.
- Symmetric PEDOT supercapacitors exhibited a specific capacitance of 76.4 F/g and specific energy of 19.8 Wh/kg.
- Ragone plot analysis revealed a combination of high specific power and high specific energy.
Conclusions:
- VPP is a superior method for manufacturing high-performance PEDOT electrodes for energy storage.
- The developed PEDOT supercapacitors offer a unique blend of capacitor power and battery energy density.
- These findings represent a significant advancement towards next-generation energy storage devices.
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