Solvothermal synthesis of graphene–MnO2 nanocomposites and their electrochemical behavior

Ezeigwe, Ejikeme Raphael; Tan, Michelle T.T.; Khiew, Poi Sim; Chiu, Wee Siong

doi:10.1016/j.ceramint.2015.05.105

Cited by 58 publications

(9 citation statements)

References 50 publications

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“…28 Also, a owery MnO 2 /graphene complex was prepared using GO and MnSO 4 as the raw material via electrochemical deposition, and in a three-electrode system, the specic capacitance can reach 595.7 F g À1 at the current density of 1 A g À1 . 29 Previously, MnO 2 with different microstructures has been successfully prepared and tested, [30][31][32][33][34][35] and the results show that different structures of the same materials demonstrate different electrochemical properties. Zhu et al 36 reported a core branch heterostructure nano array of a-MnO 2 nanowires and b-MnO 2 ultra-thin nanosheets that combined the mass load of the active substance with enhanced pseudocapacitance.…”

Section: Introductionmentioning

confidence: 99%

Effects of electrodeposition time on a manganese dioxide supercapacitor

Dai

Zhang

et al. 2020

RSC Adv.

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As is well known that the specific capacitance of supercapacitors cannot be improved by increasing the mass of the deposited MnO 2 films, which means an appropriate deposition duration is important. In this study, nanobelt-structured MnO 2 films were prepared by the electrochemical deposition method under different deposition time to explore the effects of electrodeposition time change on the microstructure and electrochemical properties of this material. Benefiting from the microstructure of the MnO 2 films, the transfer properties of the charged electrons and ions were promoted. Meanwhile, a 3D porous nickel foam was chosen as the deposition substrate, which rendered an enhancement of the MnO 2 conductivity and the mass of the active material. The enhanced specific capacitance and specific surface area attributed to synergistic reactions. Subsequently, the electrochemical performances of the asprepared materials were analyzed via cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS) tests. Results show that the optimum sample deposited for 50 s has a specific capacitance of 291.9 F g À1 at the current density of 1 A g À1 and lowest R ct . However, its electrochemical stability cannot come up to the level of the 300 s sample due to the microstructure change.

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Section: Introductionmentioning

confidence: 99%

Effects of electrodeposition time on a manganese dioxide supercapacitor

Dai

Zhang

et al. 2020

RSC Adv.

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“…The specific capacitance at a current density of 1 A g −1 was 289 F g −1 , but the cycle stability was not studied. However, the strong Vander Waals force between the graphene sheets tend to cause sheet stacking, which reduces the specific surface area of the graphene and can’t support PPy well 18 . This will reduce the specific capacitance and cycle stability of the polypyrrole/graphene composite.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of polypyrrole/nitrogen-doped porous carbon matrix composite as the electrode material for supercapacitors

Feng

Zhou

et al. 2020

Sci Rep

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Polypyrrole complex nitrogen-doped porous carbon matrix (PPy/N-PCM) was synthesized by a simple two-step method. Firstly, graphene oxide was prepared by the modified Hummers method. Secondly, Polypyrrole was compounded on the graphene oxide substrate, and the carbon matrix with a high specific surface area was obtained through high-temperature carbonization and KOH activation, and polypyrrole was used as a nitrogen source for the final nitrogen-doped composite material. The structure characterization of the carbon matrix and the final composite material shows that the carbon matrix surface has obvious porous structure, and the polypyrrole nanospheres grow uniformly on the porous carbon matrix surface. The electrochemical evaluation show that the prepared PPy/N-PCM has excellent supercapacitor performance, and its specific capacitance can reach 237.5 F g−1. When the current density reaches 10 A g−1, it has good cycle stability (the capacitance retention after 1000 charge and discharge is 88.53% of the initial capacitance value, which is better than pure PPy-60.76% and PPy/rGO-C-71.84%). The excellent capacitance performance, good-looking micro-morphology and simple synthesis method of the PPy/N-PCM provide the possibility for its commercialization.

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“…In recent years, some energy storage materials that store and release energy through redox reactions have attracted increasing interest as flexible electrode materials, since they have higher specific capacitance than carbon materials [24,25]. Decoration onto graphene of pseudo capacitive materials such as manganese dioxide [26][27][28][29][30], ruthenium dioxide [31,32], titanium dioxide [33,34], cobalt oxide [35,36], nickel and zinc cobaltate (NiCo2O4/ZnCo2O4) [37,38], nickel hydroxide [Ni(OH)2] [39] and cobalt nickel sulfide (CoNi2S4) [40] has led to significant improvements in electrode capacitance. Among the various reported pseudo capacitive materials, MnO2 has attracted much attention due to its low cost, environmental friendliness and high theoretical specific capacitance [27].…”

Section: Synthesis Of Hierarchical Graphene-mno 2 Nanowirementioning

confidence: 99%

Synthesis of Hierarchical Graphene-MnO2 Nanowire Composites with Enhanced Specific Capacitance

et al. 2019

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Hierarchical nanostructured graphene-manganese dioxide nanowire (G-MnO2-NW) composites have been prepared by hydrothermal synthesis route using water/1-decanol as the medium. Synthesized materials were analyzed using various characterization tools to corroborate their chemical compositions, structure/morphology and surface area. Electrochemical measurements of the synthesized G-MnO2-NW electrode materials delivered the highest specific capacity (255 Fg-1), high rate capability and improved cycling stability at 0.5 Ag-1 in 1M sodium sulfate solution and this fact may be attributed to its high surface area and porosity. Moreover, synthesized G-MnO2-NW electrodes displayed better energy and power density, when compared to the MnO2-NW based electrodes.

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Solvothermal synthesis of graphene–MnO2 nanocomposites and their electrochemical behavior

Cited by 58 publications

References 50 publications

Effects of electrodeposition time on a manganese dioxide supercapacitor

Effects of electrodeposition time on a manganese dioxide supercapacitor

Synthesis of polypyrrole/nitrogen-doped porous carbon matrix composite as the electrode material for supercapacitors

Synthesis of Hierarchical Graphene-MnO2 Nanowire Composites with Enhanced Specific Capacitance

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