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Ion Exchange01:17

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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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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Radical reactions can occur either intermolecularly or intramolecularly. In an intermolecular radical reaction, a nucleophilic radical adds to an electrophilic alkene or vice versa. In such reactions, the radical and generally the alkene, which is also called the radical trap, are two different molecules. Additionally, for such intermolecular reactions to occur, the radical trap must be active, present in an excess concentration, and the radical starting material must have a weak...
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Updated: May 7, 2025

Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone
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Reversible multivalent carrier redox exceeding intercalation capacity boundary.

Yuanhe Sun1, Rui Qi1,2,3, Qi Lei1

  • 1Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, 201204, China.

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|January 2, 2025
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Summary
This summary is machine-generated.

Aqueous multivalent-ion batteries using copper in vanadium sulfide (VS2) achieve high capacity by exceeding theoretical limits. This breakthrough offers insights into advanced energy storage chemistry.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Aqueous multivalent-ion batteries offer higher capacity than monovalent-ion systems due to multiple electron transfers.
  • Previous limitations included host material redox limits and kinetic hysteresis from ion charge/radius ratios.
  • The role of the intercalated ion's redox activity was not fully understood.

Purpose of the Study:

  • To investigate copper carrier redox in vanadium sulfide (VS2) for aqueous multivalent-ion batteries.
  • To explore exceeding the intrinsic intercalation capacity boundary.
  • To understand the mechanism behind enhanced capacity and stability.

Main Methods:

  • Operando X-ray absorption spectroscopy.
  • Operando synchrotron X-ray diffraction.
  • Composite ex situ characterization.

Main Results:

  • Copper redox in VS2 achieved a record capacity of 675 mAh g−1 at 0.4 A g−1.
  • Divalent copper preferentially underwent redox, forming monovalent copper pillars.
  • This mechanism ensured stable intercalation and fast ion migration kinetics.

Conclusions:

  • Copper redox in VS2 surpasses intrinsic capacity limits, demonstrating a new high-performance cathode.
  • The formation of reversible copper pillars facilitates stable and efficient ion storage.
  • This work highlights the advantage of intercalated carrier redox in multivalent-ion batteries.