Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 24, Issue 1, Pages 541-550Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1cp03899k
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Funding
- GACR [20-03913S, 18-14990S]
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The presence of solvent-free ionic liquid (SF-IL) near poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) results in a decrease in the oxidation level of the polymer and an increase in the HOMO-LUMO gap, as shown by Raman spectra. Quantum chemical calculations illustrate the process of polymer dedoping and the modification of the electronic structure of the polymer.
The conductive polymer-electrolyte interface plays an important role in many electrochemical devices. An unusual situation arises when a solvent-free ionic liquid (SF-IL) is used as the electrolyte because it behaves as a molten salt rather than an electrolyte solution. On the basis of Raman spectra, it was found that the presence of ion pairs of SF-IL in the vicinity of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) results in a decrease in the oxidation level of the polymer and an increase in the HOMO-LUMO gap. The process of polymer dedoping and the modification of the electronic structure of the polymer are illustrated by quantum chemical calculations.
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