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Oxygen-induced doping on reduced PEDOT.

E Mitraka1, M J Jafari2, M Vagin1,2

  • 1Department of Science and Technology , Linkoping University , Campus Norrkoping , S-60174 Norrkoping , Sweden .

Journal of Materials Chemistry. A
|June 6, 2017
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Summary
This summary is machine-generated.

Poly(3,4-ethylenedioxythiophene) (PEDOT) acts as an air electrode in renewable energy devices. Oxygen doping during the oxygen reduction reaction (ORR) maintains PEDOT conductivity, enabling its function.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Renewable Energy Technologies

Background:

  • Poly(3,4-ethylenedioxythiophene) (PEDOT) is a promising air electrode material for metal-air batteries and fuel cells.
  • PEDOT synthesis is cost-effective, utilizing abundant elements and low-temperature solution processing.
  • The exact mechanism of the oxygen reduction reaction (ORR) on PEDOT:Cl remains debated, with potential involvement of transition metal impurities.

Purpose of the Study:

  • To elucidate the role of PEDOT in the oxygen reduction reaction (ORR) mechanism.
  • To demonstrate the decoupling of conductivity and electrocatalysis in PEDOT during ORR.
  • To provide evidence for oxygen doping of PEDOT during the ORR.

Main Methods:

  • Electrochemical characterization of PEDOT electrodes.
  • Investigation of oxygen interaction with PEDOT using various spectroscopic techniques.
  • Analysis of conductivity changes in PEDOT under ORR conditions.

Main Results:

  • PEDOT electrodes are electrochemically reduced (undoped) within the ORR voltage range.
  • Oxygen sustains the conductivity of PEDOT during the ORR, despite electrochemical reduction.
  • Spectroscopic studies confirmed the interaction between oxygen and the PEDOT electrode.

Conclusions:

  • PEDOT functions as an effective air electrode for the ORR due to oxygen-induced doping.
  • The conductivity of PEDOT is maintained by oxygen, enabling its role in electrochemical energy conversion.
  • This study highlights a novel mechanism of polymer doping by reactants in electrocatalysis.