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Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System

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

Wenrong Yan^1,2, Haibo Hu¹, Lei Wang²

¹Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, China.

|April 23, 2022

Summary

This study introduces a dual laser pyrolysis method to enhance laser-induced graphene (LIG) electrodes for microsupercapacitors (MSCs). The new technique significantly boosts charge storage capacity and conductance, enabling high-performance energy storage devices.

Keywords:

defocused laser pyrolysis laser-induced graphene self-assemblies self-healable microsupercapacitors

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Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography

Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography

Published on: May 15, 2017

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.