Inkjet-Printed High-Performance Flexible Micro-Supercapacitors with Porous Nanofiber-Like Electrode Structures

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Flexible planar micro-supercapacitors (MSCs) are crucial for portable electronics.
• Existing fabrication methods for high-performance MSCs are often complex and costly.
• There is a need for scalable and efficient methods to produce flexible energy storage devices.

Purpose of the Study:

• To develop a facile and cost-effective method for fabricating high-performance flexible planar MSCs.
• To investigate the impact of porous nanofiber-like electrode structures on MSC performance.
• To demonstrate the potential of inkjet printing for creating modular and customizable flexible MSCs.

Main Methods:

• Fabrication of flexible planar MSCs using a combination of electrochemical deposition and inkjet printing.
• Characterization of the electrode structures and electrochemical performance (areal capacitance, capacitance retention).
• Testing of mechanical flexibility through repeated bending cycles.

Main Results:

• Achieved a high areal capacitance of 46.6 mF cm⁻² in inkjet-printed flexible planar MSCs.
• Demonstrated superior mechanical flexibility with 86.8% capacitance retention after 1000 bending cycles (180°).
• Successfully fabricated modular MSCs in series and parallel configurations using inkjet printing without external interconnects.

Conclusions:

• The proposed inkjet printing strategy offers a simplified and cost-effective route to high-performance flexible MSCs.
• The porous nanofiber-like electrode structure significantly enhances electrochemical performance.
• Inkjet-printed flexible MSCs show great potential for applications in wearable electronics and beyond.