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Benzidine derivatives show promise as electroactive materials for organic redox flow batteries, enabling multielectron transfers in aqueous solutions. These novel molecules offer potential for stable and efficient energy storage systems.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Organic Chemistry

Background:

  • Organic redox flow batteries require stable, water-soluble electroactive molecules.
  • Benzidine derivatives are explored for their potential in multielectron transfer processes.

Purpose of the Study:

  • To evaluate benzidine derivatives as electroactive materials for organic redox flow batteries.
  • To synthesize, characterize, and theoretically study a specific benzidine derivative for its electrochemical properties.

Main Methods:

  • Synthesis and electrochemical characterization of sodium 4-diphenylamine sulfonate dimer.
  • Theoretical calculation and experimental calibration of Pourbaix diagrams for various benzidine derivatives.
  • Screening of derivatives for suitable redox potentials and pH stability.

Main Results:

  • The sodium 4-diphenylamine sulfonate dimer exhibits bielectronic and single-electron transfer processes across different pH ranges.
  • Calculated Pourbaix diagrams, calibrated with experimental data, guided the selection of promising candidates.
  • Selected benzidine derivatives demonstrated potential for generating theoretical cell voltages up to 0.68 V.

Conclusions:

  • Benzidine derivatives are viable candidates for electroactive materials in full-organic redox flow batteries.
  • Tuning substitution patterns and functional groups optimizes performance for specific pH conditions.
  • These molecules offer a pathway towards more sustainable and efficient organic redox flow battery technologies.