Flexible Array of Microsupercapacitor for Additive Energy Storage Performance Over a Large Area

Area of Science:

• Materials Science
• Nanotechnology
• Electrochemistry

Background:

• Microsupercapacitors (MSCs) are crucial for portable electronics.
• Developing flexible and high-performance MSCs remains a challenge.

Purpose of the Study:

• To develop a flexible, on-chip microsupercapacitor with enhanced capacitance and energy density.
• To investigate the electrochemical performance of the fabricated MSCs under mechanical stress.

Main Methods:

• Layer-by-layer spray deposition of manganese dioxide (MnO2) nanoparticle-coated carbon nanotubes (MnO2-CNTs) and MnO2 nanosheet-decorated reduced graphene oxide (MnO2-rGO) on flexible polyethylene terephthalate.
• Fabrication of solid-state flexible MSCs.

Main Results:

• Achieved ultrahigh capacitance of 7.43 mF/cm2 (32300 mF/cm3) and energy density of 0.66 μW h/cm2 (2870 μW h/cm3).
• Demonstrated robust electrochemical response under multiple bending and approximately 5000 repetitive cycles.

Conclusions:

• Layer-by-layer patterning enables rapid ion diffusion, leading to superior electrochemical performance.
• The developed flexible MSCs show promise for applications in wearable electronics and portable devices.