Structural control of charge storage capacity to achieve 100% doping in vapor phase-polymerized PEDOT/tosylate

Junaiz Rehmen, Kamil Zuber, Mohsen Modarresi, Donghyun Kim, Eric Charrault, Patric Jannasch, Igor Zozoulenko, Drew Evans, Christoffer Karlsson

Research output: Contribution to journalArticlepeer-review

7 Citations (SciVal)

Abstract

Vapor phase polymerization (VPP) is used to fabricate a series of tosylate-doped poly(3,4-ethylenedioxythiophene) (PEDOT) electrodes on carbon paper. The series of VPP PEDOT/tosylate coatings has varying levels of crystallinity and electrical conductivity because of the use (or not) of nonionic triblock copolymers in the oxidant solution during synthesis. As a result, the impact of the structure on charge storage capacity is investigated using tetra-n-butylammonium hexafluorophosphate (0.1 M in acetonitrile). The ability to insert anions, and hence store charge, of the VPP PEDOT/tosylate is inversely related to its electrical conductivity. In the case of no nonionic triblock copolymer employed, the VPP PEDOT/tosylate achieves electrochemical doping levels of 1.0 charge per monomer or greater (≥100% doping level). Such high doping levels are demonstrated to be plausible by molecular dynamics simulations and density functional theory calculations. Experiments show that this high doping level is attainable when the PEDOT structure is weakly crystalline with (relatively) large crystallite domains.
Original languageEnglish
Pages (from-to)21818-21826
JournalACS Omega
Volume4
Issue number26
DOIs
Publication statusPublished - 2019

Subject classification (UKÄ)

  • Polymer Technologies
  • Materials Chemistry
  • Physical Chemistry
  • Condensed Matter Physics

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