Direct laser writing of MnOx x decorated laser-induced graphene on paper for sustainable microsupercapacitor fabrication

Author(s)

Abreu, Rodrigo ; Klem, Maykel dos Santos ; Pinheiro, Tomas ; Pinto, Joana Vaz ; Alves, Neri ; Martins, Rodrigo ; Carlos, Emanuel ; Coelho, Joao

• Document type: Journal article
• Source: FLATCHEM; v. 46, p. 9-pg., 2024-05-17.

Abstract

Laser-induced graphene (LIG) on paper is a popular choice for fabricating flexible micro-supercapacitors (MSCs) as it is a simple and sustainable process. However, carbon-based MSC electrodes have limited energy densities. To address this challenge, this study presents a highly reproducible and cost-effective method for decorating manganese oxide (MnOx) x ) on interdigital LIG MSC electrodes, fabricated via a single-step direct laser writing (DLW) process on paper substrates. The paper fibers embedded with MnOx x precursors are transformed into graphene through laser processing while reducing the salt, resulting in the formation of MnOx-LIG. x-LIG. The resulting MnOx-LIG-MSC x-LIG-MSC exhibits a specific capacitance of 12.30 mF cm- 2 (0.05 mA cm- 2 ) with a 60 % retention at 1000 bending cycles (30 degrees), degrees ), due to the pseudocapacitive contribution of MnOx. x . Furthermore, the devices exhibit high electrochemical stability, retaining 190 % of the initial specific capacitance after 10,000 cycles, and a high energy density of 2.6 mu Wh cm-- 2 (at a power of 0.109 mW cm-- 2 ). The study demonstrates that manganese oxide- based LIG-MSCs have the potential to be used as energy storage devices for portable, low-cost, and flexible paper electronics. (AU)

• FAPESP's process: 18/02604-4 - Study of printed supercapacitors integrating electrolyte-gated transistors
• Grantee: Maykel dos Santos Klem
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 22/12332-7 - Printed electronic devices for sustainable electronics
• Grantee: Neri Alves
• Support Opportunities: Regular Research Grants
• FAPESP's process: 21/14141-1 - Study of laser-induced graphene-based electrodes aiming applications in biodegradable devices
• Grantee: Maykel dos Santos Klem
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate