Dual Defocused Laser Pyrolysis: A Lasing-Centric Strategy for Defect and Morphological Optimization in...

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Laser-induced graphene (LIG) shows promise for microsupercapacitors (MSCs) but faces limitations in charge storage capacity and conductivity.
• Optimizing LIG electrode properties is crucial for advancing micro-energy storage technologies.

Purpose of the Study:

• To develop a novel method for defect control and morphological enhancement in LIG electrodes.
• To improve the electrochemical performance of LIG-based MSCs through a unique dual laser pyrolysis technique.

Main Methods:

• A dual laser pyrolysis approach was employed, involving defocused lasing for LIG synthesis and subsequent decoration with Ruthenium (Ru) nanoparticles.
• Simultaneous optimization of defocused lasing distance and speed was performed to enhance LIG morphology and electrochemical properties.

Main Results:

• The defocused LIG electrode demonstrated a 25-fold increase in electrochemical capacitance (114 mF cm⁻²) compared to focused LIG.
• A flexible, self-healable MSC fabricated with DFLIG/Ru-PEDOT/Au electrodes achieved high areal capacitance (25.7 mF cm⁻²), excellent stability (91% retention after 8000 cycles), and good self-healing (85.6% retention).

Conclusions:

• Dual defocused laser pyrolysis is an effective strategy for enhancing LIG electrode properties for micro-energy storage.
• This method offers a controllable and scalable pathway for fabricating advanced electrodes for high-performance MSCs.