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

被引：0

作者：

Tang X. ^{[1
]}

Liu J. ^{[1
]}

Gong H. ^{[1
]}

Wu X. ^{[1
]}

Ji G. ^{[1
]}

机构：

[1] School of Materials and Metallurgy, Guizhou University, Guiyang

来源：

Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | 2022年 / 39卷 / 08期

关键词：

asymmetric supercapacitor; composites; energy storage mechanism; graphene; manganese dioxide;

D O I：

10.13801/j.cnki.fhclxb.20220120.006

中图分类号：

学科分类号：

摘要：

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−1 at 100 W·kg−1). © 2022 Beijing University of Aeronautics and Astronautics (BUAA). All rights reserved.

引用

页码：3898 / 3905

页数：7

共 27 条

[1] CHEN P C, SHEN G Z, SHI Y, Et al., Preparation and characterization of flexible asymmetric supercapacitors based on transition-metal-oxide nanowire/single-walled carbon nanotube hybrid thin-film electrodes[J], ACS Nano, 4, 8, pp. 4403-4411, (2010)
[2] LANG J W, KONG L B, WU W J, Et al., Facile approach to prepare loose-packed NiO nano-flakes materials for supercapacitors[J], Chemical Communications, 35, pp. 4213-4215, (2008)
[3] CAO L, LU M, LI H L., Preparation of mesoporous nanocrystalline Co3O4 and its applicability of porosity to the formation of electrochemical capacitance[J], Journal of the Electrochemical Society, 152, 5, pp. A871-A875, (2005)
[4] CHOU S L, WANG J Z, CHEW S, Et al., Electrodeposition of MnO2 nanowires on carbon nanotube paper as freestanding, flexible electrode for supercapacitors[J], Electrochemistry Communications, 10, 11, pp. 1724-1727, (2008)
[5] WU Z S, REN W C, WANG D W, Et al., High-energy MnO2 nanowire/graphene and graphene asymmetric electrochemical capacitors, ACS Nano, 4, 10, pp. 5835-5842, (2010)
[6] LIU Y C, MIAO X F, FANG J H, Et al., Layered-MnO2 nanosheet grown on nitrogen-doped graphene template as a composite cathode for flexible solid-state asymmetric supercapacitor[J], ACS Applied Materials & Interfaces, 8, 8, pp. 5251-5260, (2016)
[7] ZHAO X, ZHANG L L, MURALI S, Et al., Incorporation of manganese dioxide within ultraporous activated graphene for high-performance electrochemical capacitors[J], ACS Nano, 6, 6, pp. 5404-5412, (2012)
[8] YANG S H, SONG X F, ZHANG P, Et al., Facile synthesis of nitrogen-doped graphene-ultrathin MnO2 sheet composites and their electrochemical performances[J], ACS Applied Materials & Interfaces, 5, 8, pp. 3317-3322, (2013)
[9] SHENG L Z, JIANG L L, WEI T, Et al., High volumetric energy density asymmetric supercapacitors based on well-balanced graphene and graphene-MnO2 electrodes with densely stacked architectures[J], Small, 12, 37, pp. 5217-5227, (2016)
[10] ZHAO Y F, RAN W, HE J, Et al., High-performance asymmetric supercapacitors based on multilayer MnO2/graphene oxide nanoflakes and hierarchical porous carbon with enhanced cycling stability[J], Small, 11, 11, pp. 1310-1319, (2015)

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