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Conductive Polymer Coatings Control Reaction Selectivity in All-Iron Redox Flow Batteries.

Emre B Boz1,2, Ameya Bondre1, Ronald de Bruijne1

  • 1Electrochemical Materials and Systems, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, Eindhoven, 5600 MB, The Netherlands.

Advanced Materials (Deerfield Beach, Fla.)
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PubMed
Summary

Conductive polymer coatings on electrodes improve aqueous all-iron redox flow batteries. Poly(pyrrole) (PPy) reduces hydrogen evolution, while poly(3,4-ethylenedioxythiophene) (PEDOT) enhances efficiency for grid-scale energy storage.

Keywords:
PEDOTall‐iron redox flow batteriesconductive polymershydrogen evolutionpolypyrroleporous electrodesreaction selectivity

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • Aqueous all-iron redox flow batteries offer economical grid-scale energy storage using abundant iron and water.
  • Challenges include iron plating/stripping and hydrogen evolution at the negative electrode, limiting performance and durability.

Purpose of the Study:

  • To tailor negative electrode reaction selectivity in all-iron redox flow batteries.
  • To investigate the impact of conductive polymer coatings (PEDOT/PSS and PPy/PSS) on battery performance and durability.

Main Methods:

  • Conformal coating of porous carbonaceous electrodes with poly(3,4-ethylenedioxythiophene) (PEDOT) and poly(pyrrole) (PPy) using poly(4-styrenesulfonate) (PSS) as a dopant.
  • Electrochemical studies on model platforms (rotating disc electrodes) and in full all-iron redox flow cells.

Main Results:

  • Both PEDOT/PSS and PPy/PSS coatings reduced hydrogen evolution current.
  • PPy/PSS strongly inhibited hydrogen evolution at high overpotentials.
  • PPy/PSS extended cyclability and reduced hydrogen evolution in flow cells.
  • PEDOT/PSS improved round-trip efficiency, potentially via a redox shuttle mechanism.

Conclusions:

  • Conductive polymer coatings effectively engineer reaction selectivity in all-iron redox flow batteries.
  • PPy/PSS and PEDOT/PSS offer distinct benefits for improving battery durability and efficiency.
  • This approach holds promise for advancing flow battery technology and other electrochemical systems.