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A twelve-electron conversion iodine cathode enabled by interhalogen chemistry in aqueous solution.

Wenjiao Ma1, Tingting Liu1, Chen Xu1

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|September 7, 2023
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel twelve-electron transfer iodine electrode for high energy density aqueous batteries. This breakthrough utilizes interhalogen chemistry to achieve a six-fold increase in electron transfer, boosting battery performance.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • High energy density batteries require redox couples with multi-electron transfer capabilities and high redox potential.
  • Conventional aqueous batteries often face limitations in energy density due to redox couple constraints.

Purpose of the Study:

  • To develop a novel twelve-electron transfer iodine electrode for advanced aqueous batteries.
  • To enhance the energy density and electrochemical performance of aqueous battery systems.

Main Methods:

  • Investigated a twelve-electron transfer iodine electrode based on iodide/iodate conversion in an aqueous electrolyte.
  • Utilized interhalogen chemistry between iodine and bromide in an acidic electrolyte to create an electrochemical-chemical loop (bromide-iodate loop).
  • Evaluated the electrode's performance in a zinc-iodine full battery and an acid-alkaline decoupling battery.

Main Results:

  • Achieved a twelve-electron transfer, six times greater than conventional iodide/iodine couples.
  • Demonstrated a high specific capacity of 1200 mAh g-1 with good reversibility.
  • Reported a high energy density of 1357 Wh kg-1 for the developed iodine electrode.

Conclusions:

  • The novel twelve-electron iodine electrode shows significant promise for future high energy density aqueous battery designs.
  • The interhalogen-mediated electrochemical-chemical loop effectively accelerates reaction kinetics and reversibility.
  • Validated the potential of this system in practical battery configurations like zinc-iodine and acid-alkaline decoupling batteries.