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Related Concept Videos

Ion Exchange01:17

Ion Exchange

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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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Functionalized Agarose Self-Healing Ionogels Suitable for Supercapacitors.

Tushar J Trivedi1, Dhrubajyoti Bhattacharjya2,3, Jong-Sung Yu4

  • 1AcSIR, CSIR-Central Salt and Marine Chemicals Research Institute, G. B. Marg, Bhavnagar, 364002, India.

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Functionalized agarose in ionic liquids forms self-healing ionogels. These biopolymer gels show promise as flexible electrolytes for robust supercapacitors with long lifespans.

Keywords:
carbohydrateselectrochemistryfunctionalizationgelsionic liquids

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Electrochemistry

Background:

  • Ionic liquids (ILs) offer unique reaction media for biopolymer modification.
  • Functionalization of biopolymers like agarose can impart novel properties.
  • Self-healing materials are crucial for durable energy storage devices.

Purpose of the Study:

  • To functionalize agarose using ionic liquids.
  • To develop thermoreversible, self-healing ionogels from functionalized agarose.
  • To evaluate the potential of these ionogels as solid electrolytes in supercapacitors.

Main Methods:

  • Agarose functionalization via acetylation and carbanilation in 1-butyl-3-methylimidazolium acetate.
  • Formation of thermoreversible ionogels by cooling carbanilated agarose solutions.
  • Preparation of mixed ionic liquid systems for enhanced ionogel properties.
  • Rheological measurements to assess self-healing capabilities.
  • Fabrication and electrochemical testing of activated-carbon supercapacitors using the ionogel electrolyte.

Main Results:

  • Acetylated agarose exhibited hydrophobicity; carbanilated agarose was soluble in water and ILs.
  • Thermoreversible ionogels were successfully synthesized.
  • Ionogels from a mixed IL system demonstrated superior self-healing properties due to hydrogen bonding.
  • The ionogel served as a flexible solid electrolyte in supercapacitors, showing comparable specific capacitance to liquid electrolytes.
  • Stable performance was observed over 1000 charge-discharge cycles.

Conclusions:

  • Novel functionalized-biopolymer self-healing ionogels were developed using ionic liquid media.
  • These ionogels possess desirable flexibility and conductivity for energy storage applications.
  • The materials exhibit potential for creating robust and long-lasting supercapacitors and electronic skins.