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Related Concept Videos

Ion Exchange01:17

Ion Exchange

591
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...
591

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Cross-Linked Polyacrylic-Based Hydrogel Polymer Electrolytes for Flexible Supercapacitors.

Lanxin Shi1, Pengfei Jiang1, Pengxue Zhang1

  • 1School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China.

Polymers
|March 28, 2024
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Summary

Researchers developed two novel hydrogel polymer electrolytes (GPEs) for flexible energy storage. The poly(acrylic acid-co-N-methylolacrylamide)/NaNO3 GPE demonstrated superior ionic conductivity and electrochemical performance in supercapacitors.

Keywords:
N-methylolacrylamideacrylamideacrylic copolymercross-linked hydrogel polymer electrolyteflexible supercapacitor

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Chemistry

Background:

  • Hydrogel polymer electrolytes (GPEs) offer advantages over liquid electrolytes for flexible energy storage devices, including enhanced mechanical properties, flexibility, and safety.
  • Traditional liquid electrolytes pose challenges in flexible device applications due to leakage and safety concerns.

Purpose of the Study:

  • To synthesize and characterize two novel cross-linked GPEs based on poly(acrylic acid-co-acrylamide) and poly(acrylic acid-co-N-methylolacrylamide) with NaNO3 aqueous solution.
  • To evaluate the electrochemical performance of these GPEs in flexible supercapacitors.
  • To identify a GPE with optimal properties for advanced flexible energy storage applications.

Main Methods:

  • Radical polymerization was employed to prepare cross-linked GPEs using acrylic acid, acrylamide or N-methylolacrylamide, and N,N-methylenebisacrylamide as the cross-linking agent.
  • Characterization included analysis of morphology, glass transition temperature (Tg), ionic conductivity, mechanical properties, and thermal stability.
  • Flexible symmetrical supercapacitors were assembled using activated carbon electrodes and the prepared GPEs.

Main Results:

  • The poly(acrylic acid-co-N-methylolacrylamide)/NaNO3 (P(AA-co-HAM)/NaNO3) GPE exhibited a high ionic conductivity of 2.00 × 10-2 S/cm and a low glass transition temperature of 152 °C.
  • This GPE demonstrated appropriate mechanical properties, attributed to hydrogen bonding and moderate cross-linking.
  • Supercapacitors utilizing P(AA-co-HAM)/NaNO3 GPE achieved a specific capacitance of 63.9 F/g at 0.2 A/g with 89.4% capacitance retention after 3000 cycles.

Conclusions:

  • The P(AA-co-HAM)/NaNO3 hydrogel polymer electrolyte presents a promising alternative for flexible energy storage due to its superior ionic conductivity and electrochemical stability.
  • The study highlights a practical strategy for designing high-performance GPEs for flexible supercapacitors.
  • These findings pave the way for the development of advanced, safe, and flexible energy storage solutions.