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A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
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Ladder diagrams are useful tools for understanding redox equilibrium reactions, especially the effects of concentration changes on the electrochemical potential of the reaction. The vertical axis in the redox ladder diagrams represents the electrochemical potential, E. The area of predominance is demarcated using the Nernst equation.
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Redox Reaction in Ti-Mn Redox Flow Battery Studied by X-ray Absorption Spectroscopy.

Daisuke Asakura1,2,3, Eiji Hosono1,2,3, Miho Kitamura4,5

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Chemistry, an Asian Journal
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X-ray absorption studies reveal manganese disproportionation in Ti-Mn redox flow batteries. Suppressing this reaction is crucial for improving battery cyclability and energy density.

Keywords:
Redox flow batteryX-ray absorption spectroscopyelectrolyteelectronic structureredox reaction

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Spectroscopy

Background:

  • Titanium-manganese (Ti-Mn) redox flow batteries (RFBs) offer potential for large-scale energy storage.
  • Improving the cyclability and energy density of Ti-Mn RFBs is critical for their practical application.
  • Manganese disproportionation reactions in the charged catholyte are a key challenge affecting Ti-Mn RFB performance.

Purpose of the Study:

  • To investigate the redox reactions of titanium (Ti) and manganese (Mn) ions in Ti-Mn RFB electrolytes.
  • To understand the formation of precipitates in the charged catholyte.
  • To elucidate the mechanism of manganese disproportionation and its impact on battery performance.

Main Methods:

  • Hard X-ray absorption spectroscopy (XAS) was used to study the electrolytes.
  • Soft X-ray absorption spectroscopy was employed to directly observe the 3d orbitals of Ti and Mn ions.
  • Scanning transmission X-ray microscopy (STXM) was utilized to analyze the electronic structure of precipitates and solutions.

Main Results:

  • The valence of Mn in the precipitate was primarily determined to be 4+.
  • The solution phase was found to contain only Mn2+ ions.
  • Charge disproportionation of Mn ions (from Mn3+ to Mn4+ and Mn2+) was identified as a key reaction occurring after initial oxidation.

Conclusions:

  • The study provides insights into the redox behavior of Ti and Mn ions in Ti-Mn RFBs.
  • Understanding manganese disproportionation is essential for mitigating performance degradation in these batteries.
  • Suppression of the observed disproportionation reaction is a critical target for enhancing Ti-Mn RFB cyclability and energy density.