Deposition of MnO<sub>2</sub> on KOH-activated laser-produced graphene for a flexible planar micro-supercapacitor

XI Shuang; GAO Xing-wei; CHENG Xi-ming; LIU Hui-long

doi:10.1016/S1872-5805(23)60769-3

Volume 38 Issue 5

Oct. 2023

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Article Navigation > New Carbon Mater. > 2023 > 38(5): 913-924

XI Shuang, GAO Xing-wei, CHENG Xi-ming, LIU Hui-long. Deposition of MnO2 on KOH-activated laser-produced graphene for a flexible planar micro-supercapacitor. New Carbon Mater., 2023, 38(5): 913-924. doi: 10.1016/S1872-5805(23)60769-3

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XI Shuang, GAO Xing-wei, CHENG Xi-ming, LIU Hui-long. Deposition of MnO₂ on KOH-activated laser-produced graphene for a flexible planar micro-supercapacitor. New Carbon Mater., 2023, 38(5): 913-924. doi: 10.1016/S1872-5805(23)60769-3

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Deposition of MnO₂ on KOH-activated laser-produced graphene for a flexible planar micro-supercapacitor

doi: 10.1016/S1872-5805(23)60769-3

1.
College of Mechanical and Electronic Engineering, Nanjing Forestry University, Nanjing 210037, China
2.
State Key Laboratory of Precision Electronic Manufacturing Technology and Equipment & School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, China

Funds: This work was financially supported by the Natural Science Foundation of Guangdong Province, China (2022A1515011334) and National Natural Science Foundation of China (52205457)

More Information

Corresponding author: XI Shuang, Associate professor. E-mail: shuangxi@njfu.edu.cn; LIU Hui-long, Associate professor. E-mail: huilong.liu@gdut.edu.cn
Received Date: 2023-03-23
Accepted Date: 2023-06-15
Rev Recd Date: 2023-06-15

Available Online: 2023-07-12

Publish Date: 2023-10-01

Abstract

Abstract

The rapid development of flexible supercapacitors has been impeded by the difficulty of preparing flexible electrodes. We report the fabrication of a highly flexible and conductive microporous graphene-based substrate obtained by direct laser writing combined with KOH activation, which we call activated laser-produced graphene (a-LPG), which is then decorated with electrochemically deposited MnO₂ to form a flexible a-LIG/MnO₂ thin-film electrode. This hybrid electrode has a high areal capacitance of 304.61 mF/cm² at a current density of 1 mA/cm² in a 1 mol/L Na₂SO₄ aqueous electrolyte. A flexible asymmetric supercapacitor with a-LIG/MnO₂ as the anode, a-LIG as the cathode and PVA/ H₃PO₄ as a gel electrolyte was assembled, giving an areal energy density of 2.61 μWh/cm² at a power density of 260.28 µW/cm² and an ultra-high areal capacitance of 18.82 mF/cm² at 0.2 mA/cm², with 90.28% capacitance retained after 5 000 cycles. It also has an excellent electrochemical performance even in the bent state. This work provides an easy and scalable method to design high-performance flexible supercapacitor electrodes and may open a new way for their large-scale fabrication.
- Micro-supercapacitor,
- Laser processing,
- Flexible electrode,
- Porous graphene

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References

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