High-performance transparent and stretchable all-solid supercapacitors based on highly aligned carbon nanotube...

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Carbon nanotube (CNT) sheets offer unique optical and mechanical properties.
• Developing transparent and stretchable energy storage devices is a significant challenge.
• All-solid-state supercapacitors require robust electrode and current collector materials.

Purpose of the Study:

• To develop high-performance transparent and stretchable all-solid supercapacitors.
• To utilize highly aligned carbon nanotube sheets as both current collectors and active electrodes.
• To evaluate the optical, mechanical, and electrochemical stability of the developed supercapacitors.

Main Methods:

• Fabrication of supercapacitors using cross-over assembly of single-layer CNT sheets.
• Characterization of optical transmittance at 550 nm.
• Evaluation of electrochemical performance including specific capacitance.
• Testing of mechanical stretchability (up to 30% strain) and cycling stability.

Main Results:

• Achieved a transmittance of up to 75% at 550 nm for the transparent supercapacitors.
• Demonstrated a specific capacitance of 7.3 F g(-1).
• Confirmed biaxial stretchability up to 30% strain without significant performance degradation.
• Showcased good stability over hundreds of stretching cycles.

Conclusions:

• Highly aligned CNT sheets are effective for creating transparent, stretchable, and stable all-solid supercapacitors.
• The developed supercapacitors exhibit promising performance for flexible and wearable electronics.
• This work highlights the potential of CNT-based materials in advanced energy storage applications.