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Redox-active electrolyte for supercapacitor application.

Elzbieta Frackowiak1, Mikolaj Meller, Jakub Menzel

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Supercapacitor carbon electrodes show enhanced performance with redox-active additives like hydroquinone and iodide in aqueous electrolytes. These modifications significantly boost capacitance and stability for advanced energy storage applications.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • Supercapacitors are crucial for energy storage.
  • Electrode material and electrolyte composition significantly influence supercapacitor performance.
  • Redox-active species can enhance pseudocapacitance in supercapacitors.

Purpose of the Study:

  • To investigate the electrochemical behavior of supercapacitor carbon electrodes.
  • To evaluate the impact of various redox-active species on electrode performance.
  • To explore the potential of modified aqueous electrolytes for supercapacitor applications.

Main Methods:

  • Electrochemical characterization of carbon electrodes in aqueous solutions.
  • Addition of hydroxybenzenes, bromine derivatives, and iodide as electrolyte modifiers.
  • Performance evaluation using galvanostatic cycling, cyclic voltammetry, and floating.
  • In situ Raman spectroscopy for mechanistic studies.

Main Results:

  • High capacitance values were achieved with 1,4-dihydroxybenzene (hydroquinone) in acidic and alkaline solutions.
  • Bromine derivatives of dihydroxybenzenes further increased capacitance in alkaline electrolytes.
  • The iodide/iodine redox couple in 2 mol L(-1) NaI aqueous electrolyte provided the most significant faradaic contribution.
  • Stable capacitance values of 300-400 F g(-1) were maintained over 100,000 cycles.

Conclusions:

  • Redox-active species are effective in enhancing supercapacitor performance.
  • Hydroquinone and iodide-based electrolytes show promise for high-performance supercapacitors.
  • The study elucidates the mechanism of pseudocapacitance in modified systems.