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Enhanced Supercapacitor Performance via Double Network Hydrogel Modified with Self-Assembled Metal Nanoparticles
Aminur Rahman1, Chanchal Kumar Roy1, Kamrul Hasan1
1Department of Chemistry, Bangladesh University of Engineering and Technology, Dhaka 1000, Bangladesh.
The Journal of Physical Chemistry. B
|February 12, 2026
Summary
This study introduces metal nanoparticle-modified double-network (DN) hydrogels for flexible supercapacitors. These novel materials offer improved electrolyte retention and conductivity, enabling high-performance energy storage devices.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Double-network (DN) hydrogels show promise for flexible supercapacitors due to mechanical strength and flexibility.
- Limitations include poor electrolyte retention and low ionic conductivity, hindering performance.
- Novel modifications are needed to overcome these challenges for practical applications.
Purpose of the Study:
- To develop a novel double-network (DN) hydrogel modified with self-assembled metal nanoparticles.
- To enhance electrolyte retention and ionic conductivity for improved supercapacitor performance.
- To fabricate and evaluate a flexible supercapacitor (FSC) using the modified DN hydrogel.
Main Methods:
- Synthesized DN hydrogel via physical and chemical cross-linking.
- Incorporated metal ions and reduced them in situ to form nanoparticles within the hydrogel network.
- Fabricated a flexible supercapacitor using the nanocomposite hydrogel as electrode and electrolyte, with activated carbon nanosheets (ACNSs) from banana leaves as the active material.
Main Results:
- The nanocomposite hydrogel exhibited enhanced electrolyte swelling capacity and ionic conductivity while maintaining mechanical flexibility.
- The fabricated FSC achieved a high areal specific capacitance of 1361 mF cm-2, energy density of 23 mWh cm-2, and power density of 700 mW cm-2.
- The device demonstrated excellent cyclic stability, retaining 94% of its initial Coulombic efficiency after 500 cycles.
Conclusions:
- Metal nanoparticle-enriched DN hydrogels are effective for flexible supercapacitor applications.
- The developed hydrogel overcomes limitations of traditional DN hydrogels, offering superior performance.
- These materials hold potential for next-generation integrated energy storage devices.
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