Design and Testing of Autonomous Chargeable and Wearable Sweat/Ionic Liquid-Based Supercapacitors
Samayanan Selvam1, Young-Kwon Park2, Jin-Heong Yim1
1Division of Advanced Materials Engineering, Kongju National University, Budaedong 275, Seobuk-gu, Cheonan-si, Chungnam, 31080, South Korea.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|July 10, 2022
Summary
This study presents self-charging supercapacitors using ionic liquid electrolytes and sweat. These wearable devices offer high energy storage for smart electronics, utilizing a novel polymer-graphene oxide-metal chelate film.
Area of Science:
- Materials Science
- Electrochemistry
- Wearable Technology
Background:
- Supercapacitors are crucial for energy storage in electronics.
- Developing self-charging and biocompatible energy sources for wearables is a significant challenge.
Purpose of the Study:
- To demonstrate novel sweat-based dual electrolyte supercapacitors capable of self-charging.
- To investigate the energy harvesting and storage performance of these devices for wearable applications.
Main Methods:
- Fabrication of supercapacitor electrodes using TREN, poly-3,4-ethylenedioxythiophene, and a graphene oxide mixture with copper-mediated chelate.
- Integration of a dual electrolyte system combining sweat and ionic liquid.
- Testing device performance on textile fabrics and ITO-PET films during simulated exercise.
Main Results:
- Achieved a maximum areal capacitance of 3600 mF cm⁻² and energy density of 450 mWhcm⁻², exceeding previous reports by over 100 times.
- Demonstrated stable self-charging performance in response to sweat wetting time on both fabric and film substrates.
- Exhibited good pH response and biocompatibility.
Conclusions:
- The developed ionic liquid electrolyte-inscribed sweat-based supercapacitors represent a promising multi-functional energy system.
- These devices offer a stable power source for next-generation wearable smart electronics due to their high performance and self-charging capability.
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