Dual-Core Supercapacitor Yarns: An Enhanced Performance Consistency and Linear Power Density

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Pliable energy-storage devices are crucial for wearable and implantable electronics.
• Yarn-shaped supercapacitors (YSCs) offer design versatility but suffer from low power output and inconsistent performance.
• Linear geometry and curved interfaces in traditional YSCs limit their potential.

Purpose of the Study:

• To develop a YSC with enhanced power output and performance consistency.
• To investigate the effect of YSC length on performance characteristics.
• To create a flexible energy-storage solution compatible with textile applications.

Main Methods:

• Fabrication of YSCs using wet-spun fibers of reduced graphene oxide and MXene sheets.
• Utilizing a unique dual-core design for the YSCs.
• Testing YSC performance under various conditions, including stretching and bending.

Main Results:

• Demonstrated YSCs with decreased equivalent series resistance and increased power output as length increased, defying conventional expectations.
• Achieved high power density (2502.6 μW cm⁻²) at an energy density of 27.1 μWh cm⁻².
• Exhibited excellent stability during stretching and bending, suitable for textile integration.

Conclusions:

• The developed YSCs present a breakthrough in flexible energy storage, offering improved power density and stability.
• The findings challenge traditional understanding of YSC performance related to length.
• This work paves the way for practical, textile-based energy-storage solutions for real-world applications.