Effect of thermal reduction temperature on the electrochemical performance of reduced graphene oxide/MnO<sub>2</sub> composites

WANG Ling-yun; WANG Yong; ZHANG Hai-xia; WANG Xiao-min

doi:10.1016/S1872-5805(15)60175-5

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WANG Ling-yun, WANG Yong, ZHANG Hai-xia, WANG Xiao-min. Effect of thermal reduction temperature on the electrochemical performance of reduced graphene oxide/MnO2 composites. New Carbon Mater., 2015, 30(1): 48-53. doi: 10.1016/S1872-5805(15)60175-5

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WANG Ling-yun, WANG Yong, ZHANG Hai-xia, WANG Xiao-min. Effect of thermal reduction temperature on the electrochemical performance of reduced graphene oxide/MnO₂ composites. New Carbon Mater., 2015, 30(1): 48-53. doi: 10.1016/S1872-5805(15)60175-5

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Effect of thermal reduction temperature on the electrochemical performance of reduced graphene oxide/MnO₂ composites

doi: 10.1016/S1872-5805(15)60175-5

College of Material Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China

Funds: National Natural Science Foundation of China (51172152, 51242007).

Received Date: 2014-08-21
Accepted Date: 2015-02-13
Rev Recd Date: 2015-01-18
Publish Date: 2015-02-28

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-pointprobe 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 ℃ had the highest specific capacitance of 321 F·g^-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.
- RGO/MnO₂ composite material,
- Specific capacitance,
- Thermal reduction,
- Functional groups

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