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Redox-Active Aqueous Microgels for Energy Storage Applications.

Elena Yu Kozhunova1, Natalia A Gvozdik2, Mikhail V Motyakin3,4

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Polymer microgels functionalized with redox-active sites offer a promising solution for advanced flow batteries. These stable colloids enable low-viscosity catholytes with high energy density.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Chemistry

Background:

  • The development of sustainable and efficient energy storage solutions is critical.
  • Flow batteries require advanced electrolytes for improved performance.
  • Redox-active colloids (RACs) are emerging as potential candidates for flow battery electrolytes.

Purpose of the Study:

  • To introduce polymer microgels as a novel class of redox-active colloids (RACs) for energy storage.
  • To functionalize water-soluble poly(N-isopropylacrylamide)-poly(acrylic acid) interpenetrating network microgels with 4-amino-TEMPO redox-active sites.
  • To evaluate the electrochemical properties and potential of these functionalized microgels in flow battery applications.

Main Methods:

  • Synthesis of poly(N-isopropylacrylamide)-poly(acrylic acid) interpenetrating network microgels.
  • Anchoring of 4-amino-2,2,6,6-tetramethylpiperidine-1-oxyl (4-amino-TEMPO) redox-active moieties onto the microgel polymer chains.
  • Electrochemical characterization using cyclic voltammetry.
  • Electron Paramagnetic Resonance (EPR) spectroscopy to confirm redox activity.

Main Results:

  • Successful functionalization of microgels with 4-amino-TEMPO groups.
  • Demonstration that approximately 14% of the anchored 4-amino-TEMPO groups retain electroactivity.
  • Observation of a reversible redox response in the functionalized microgels.
  • Achieved a stable specific capacity of 2.5 mAh/g.
  • Developed a low-viscosity catholyte with a volumetric capacity exceeding 100 mAh/L.

Conclusions:

  • Polymer microgels functionalized with 4-amino-TEMPO represent a viable new class of redox-active colloids.
  • These microgels show potential for use in advanced flow batteries, offering high volumetric energy density due to their low viscosity.
  • The demonstrated reversible redox behavior and stable capacity highlight their promise for next-generation energy storage systems.