Natural Solid-State Hydrogel Electrolytes Based on 3D Pure Cotton/Graphene for Supercapacitor Application
Nujud Badawi Mohammed1,2, Khalid Mujasam Batoo3, Sajjad Hussain4,5
1Centre for Ionics University of Malaya, Department of Physics, Faculty of Science, Universiti Malaya, Kuala Lumpur 50603, Malaysia.
Micromachines
|July 29, 2023
Summary
Researchers developed a flexible, solid-state hydrogel electrolyte using cotton and graphene for advanced supercapacitors. This material enhances ionic conductivity and specific capacitance, paving the way for next-generation energy storage devices.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Solid-state electrolytes are crucial for safer and more flexible energy storage devices.
- Traditional electrolytes face challenges in achieving high ionic conductivity and mechanical stability.
- Graphene integration offers potential for enhanced electrochemical performance.
Purpose of the Study:
- To develop a novel solid-state hydrogel electrolyte based on 3D pure cotton and graphene.
- To investigate the impact of graphene on the ionic conductivity and electrochemical properties of the hydrogel.
- To assess the potential of this composite material for next-generation supercapacitors.
Main Methods:
- Fabrication of a composite hydrogel electrolyte using 3D cotton and graphene.
- Measurement of ionic conductivity at 25 °C.
- Electrochemical characterization using cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD) tests.
- Evaluation of electrochemical stability.
Main Results:
- The ionic conductivity of the cotton/graphene hydrogel reached 13.9 × 10⁻³ S/cm at 25 °C.
- A specific capacitance of 327 F/g was achieved at 3 mV/s (CV).
- A peak specific capacitance of 385.4 F/g was observed at 100 mA/g (GCD).
- The composite hydrogel demonstrated excellent electrical stability.
Conclusions:
- The cotton/graphene hydrogel electrolyte offers a promising pathway for high-performance, flexible supercapacitors.
- Graphene significantly enhances ionic conductivity by facilitating charge carrier transport.
- This material is suitable for the design of advanced, next-generation supercapacitors.
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