Effect of thermal reduction temperature on the electrochemical performance of reduced graphene oxide/MnO2 composites
Source abstract
Abstract
Thermally reduced graphene oxide (RGO)/MnO2 composites were prepared by the thermal reduction of graphene oxide (GO)/MnO2 composites. The structure, electrical conductivity and specific capacitance of the composites before and after thermal reduction were investigated by SEM, XRD, FT-IR, the four-point probe method and cyclic voltammetry. Results showed that the GO and RGO significantly decreased the agglomeration of MnO2. The RGO/MnO2 composites had higher specific capacitances than pure MnO2 or GO/MnO2 composites. A RGO/MnO2 composite reduced at 600 °C had the highest specific capacitance of 321Fg−1 and good stability upon cycling. The presence of an optimum reduction temperature could be accounted for by the fact that the thermal reduction decreased the amount of oxygen-containing functional groups that contribute to pseudocapacitance in GO and increased its electrical conductivity which favors a capacitance increase.
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Research context
OpenAlex topics: Supercapacitor Materials and Fabrication · Advancements in Battery Materials · Conducting polymers and applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (30)
Show source-provided references
1. Enhancing the supercapacitor performance of graphene/MnO2 nanostructured electrodes by conductive wrapping [J]10.1021/nl2026635 ↗
2. Manganese oxide-based materials as electrochemical supercapacitor electrodes[J]10.1039/C0CS00127A ↗
3. Effect of crystallographic structure of MnO2 on its electrochemical capacitance properties [J]10.1021/jp7108785 ↗
4. Effect of synthetical conditions, morphology, and crystallographic structure of MnO2 on its electrochemical behavior [J]10.1007/s10008-009-0938-7 ↗
5. Alcohol-assisted room temperature synthesis of different nanostructured manganese oxides and their pseudocapacitance properties in neutral electrolyte [J]10.1016/j.cplett.2008.01.042 ↗
6. Manganese oxides: battery materials make the leap to electrochemical capacitors [J]10.1149/2.F07081IF ↗
7. Pseudocapacitive behaviors of nanostructured manganese dioxidecarbon nanotubes composite electrodes in mild aqueous electrolytes: effects of electrolytes and current collectors [J]10.1007/s10008-007-0445-7 ↗
8. Incorporation of nanostructured manganese dioxide into carbon nanofibers and its electrochemical performance [J]
9. Asymmetric supercapacitors based on Graphene/MnO2 and activated carbon nanofiber electrodes with high power and energy density [J]10.1002/adfm.201100058 ↗
10. Graphene-MnO2 subend and graphene asymmetrical electrochemical capacitor with a high energy density in aqueous electrolyte [J]10.1016/j.jpowsour.2011.09.005 ↗
11. Graphene: status and prospects [J]10.1126/science.1158877 ↗
12. Carbon nanotube polyaniline graphene composite paper and its electrochemical capacitance behaviors [J]
13. What is the choice for supercapacitors: graphene or graphene oxide? [J]10.1039/c1ee01198g ↗
14. Graphene oxide-MnO2 nanocomposites for supercapacitors [J]10.1021/nn901311t ↗
15. Preparation and characterization of graphene oxide paper [J]10.1038/nature06016 ↗
16. The effect of heat treatment on the electrical conductivity of highly conducting graphene films [J]
17. Large-area ultrathin films of reduced graphene oxide as a transparent and flexible electronic material [J]10.1038/nnano.2008.83 ↗
18. Introduction of MnO2 nanoneedles to activated carbon to fabricate high-performance electrodes as electrochemical supercapacitors [J]
19. The effect of Sn content on the electrocatalytic properties of Pt-Sn nanoparticles dispersed on graphene nanosheets for the methanol oxidation reaction [J]10.1016/j.carbon.2012.07.039 ↗
20. Factors influencing MnO2 multi-walled carbon nanotubes composite's electrochemical performance as supercapacitor electrode [J]10.1016/j.electacta.2009.07.041 ↗
21. Remarkable capacity retention of nanostructured manganese oxide upon cycling as an electrode material for supercapacitor [J]10.1021/jp811407q ↗
22. The effect of thermal treatment at low temperatures on graphene oxide films [J]
23. Electrochemical interfacial capacitance in multilayer graphene sheets: Dependence on number of stacking layers [J]10.1016/j.elecom.2009.06.034 ↗
24. Supercapacitor performances of thermally reduced graphene oxide [J]10.1016/j.jpowsour.2011.09.074 ↗
25. A simple approach for preparing transparent conductive graphene films using the controlled chemical reduction of exfoliated graphene oxide in an aqueous suspension [J]10.1021/jp105029m ↗
26. Gold nanoparticle mediated hydroxyl radical attack on reduced graphene oxide [J]10.1021/nn401794k ↗
27. Synthesis of surface-functionalized graphene nanosheets with high Pt-loadings and their applications to methanol electrooxidation [J]10.1016/j.carbon.2010.10.055 ↗
28. Highly conductive and porous activated reduced graphene oxide films for high-power supercapacitors [J]10.1021/nl203903z ↗
29. Carbon materials for the electrochemical storage of energy in capacitors [J]10.1016/S0008-6223(00)00183-4 ↗
30. Structural evolution during annealing of thermally reduced graphene nanosheets for application in supercapacitors [J]10.1016/j.carbon.2012.03.029 ↗