Energy storage mechanism and electrochemical performance of graphene/manganese dioxide composites

TANG Xiaoning; LIU Junnan; GONG Haifeng; WU Xiaoyi; JI Guiping

doi:10.13801/j.cnki.fhclxb.20220120.006

Volume 39 Issue 8

Aug. 2022

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TANG Xiaoning, LIU Junnan, GONG Haifeng, et al. Energy storage mechanism and electrochemical performance of graphene/manganese dioxide composites[J]. Acta Materiae Compositae Sinica, 2022, 39(8): 3898-3905. doi: 10.13801/j.cnki.fhclxb.20220120.006

Citation:

TANG Xiaoning, LIU Junnan, GONG Haifeng, et al. Energy storage mechanism and electrochemical performance of graphene/manganese dioxide composites[J]. Acta Materiae Compositae Sinica, 2022, 39(8): 3898-3905. doi: 10.13801/j.cnki.fhclxb.20220120.006

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Energy storage mechanism and electrochemical performance of graphene/manganese dioxide composites

doi: 10.13801/j.cnki.fhclxb.20220120.006

School of Materials and Metallurgy, Guizhou University, Guiyang 550025, China

Received Date: 2021-11-19
Accepted Date: 2022-01-07
Rev Recd Date: 2022-01-05

Available Online: 2022-01-20

Publish Date: 2022-08-31

Abstract

Abstract

Supercapacitors have been attracted tremendous attention due to their high power density and long cycle life, etc. The electrode material is the main factor affecting electrochemical properties. Graphene/manganese dioxide composites (RGO/MnO₂) were prepared using one pot hydrothermal method with graphene oxide (GO) as carbon source, as well as H₂O₂ and KMnO₄ as MnO₂ precursors. It was found that sphere-like MnO₂ distributes on the graphene sheets by the microstructure tests. The energy storage mechanism of the composite was discussed. It displays that the reaction is the surface dominant process. The surface capacitance accounts for 86.2% of the total capacitance at 5 mV·s⁻¹, While it can account for 97.3% at 200 mV·s⁻¹. In order to assemble a device with high energy density, this work fabricated an asymmetric supercapacitor (ASC, RGO/MnO₂//RGO) using the RGO/MnO₂ as the positive electrode and RGO as the negative electrode, respectively, which exhibits high energy density (72.8 W·h·kg⁻¹at 100 W·kg⁻¹).
- graphene,
- manganese dioxide,
- composites,
- energy storage mechanism,
- asymmetric supercapacitor
Long Abstrsct
Innovation Points

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References(27)

References

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