Wettability-Driven Assembly of Electrochemical Microsupercapacitors

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Microsupercapacitors (MSCs) are crucial for portable electronics.
• Current fabrication methods can be complex and costly.
• Developing efficient and scalable MSC fabrication is essential.

Purpose of the Study:

• To introduce a novel wettability-driven assembly (WDA) process for MSC fabrication.
• To utilize laser-scribed graphene (LSG) as a current collector.
• To demonstrate the assembly of active materials onto LSG collectors.

Main Methods:

• Fabrication of three-dimensional LSG from polyimide.
• Exploitation of wettability differences for selective material assembly.
• Demonstration using porous carbon and RuO2 nanoparticles.

Main Results:

• WDA process successfully assembled porous carbon and RuO2 nanoparticles onto LSG.
• Porous carbon MSCs achieved an areal capacitance of 41.2 mF cm⁻² and energy density of 5.71 μWh cm⁻².
• RuO2 nanoparticle MSCs achieved an areal capacitance of 70.3 mF cm⁻² and energy density of 9.71 μWh cm⁻².

Conclusions:

• The WDA process is a green, simple, and effective method for MSC fabrication.
• This technique enables high-performance MSCs with enhanced capacitance and energy density.
• The WDA process is versatile for various active materials.