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In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
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A Protocol for Electrochemical Evaluations and State of Charge Diagnostics of a Symmetric Organic Redox Flow Battery
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Microemulsions: Breakthrough Electrolytes for Redox Flow Batteries.

Brian A Barth1, Adam Imel1, K McKensie Nelms1

  • 1Department of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville, TN, United States.

Frontiers in Chemistry
|March 21, 2022
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Summary

This study introduces a novel microemulsion electrolyte for redox flow batteries (RFBs), combining aqueous and organic phases. This approach enhances energy density and current density for improved RFB performance.

Keywords:
electrochemical deviceselectrolytesenergy storagemicroemulsionsredox flow batteries

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • Aqueous and non-aqueous redox flow batteries (RFBs) face limitations in energy and current densities due to electrolyte properties.
  • Novel electrolyte designs are crucial for advancing RFB performance.

Purpose of the Study:

  • To develop a new type of redox flow battery electrolyte by combining aqueous and organic phases using a microemulsion.
  • To demonstrate the feasibility and performance of this novel microemulsion electrolyte in an RFB.

Main Methods:

  • Formulation of a microemulsion electrolyte incorporating a highly conductive aqueous phase and an organic redox-active phase.
  • Testing of a redox flow battery utilizing the developed microemulsion electrolyte.

Main Results:

  • Achieved a maximum current density of 17.5 mA·cm⁻² at a low flow rate (∼2.5 ml·min⁻¹).
  • Utilized an inexpensive, oil-soluble vitamin (K₃) as the active negolyte component.
  • Demonstrated performance comparable to early vanadium electrolyte RFBs on a per molar basis.

Conclusions:

  • Microemulsion electrolytes offer a promising pathway to increase energy density and expand accessible redox couples in aqueous RFBs without compromising current density.
  • Further research is needed to overcome complexities and fully realize the potential of these advanced electrolytes.