Preparation and electrochemical properties of nanostructured MnO<sub>2</sub>/exfoliated graphite composites

XU De-fang; SONG Yan; TIAN Xiao-dong; WANG Kai; GUO Quan-gui; LIU Lang

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Article Navigation > New Carbon Mater. > 2016 > 31(6): 615-620

XU De-fang, SONG Yan, TIAN Xiao-dong, WANG Kai, GUO Quan-gui, LIU Lang. Preparation and electrochemical properties of nanostructured MnO2/exfoliated graphite composites. New Carbon Mater., 2016, 31(6): 615-620.

Citation:

XU De-fang, SONG Yan, TIAN Xiao-dong, WANG Kai, GUO Quan-gui, LIU Lang. Preparation and electrochemical properties of nanostructured MnO₂/exfoliated graphite composites. New Carbon Mater., 2016, 31(6): 615-620.

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Preparation and electrochemical properties of nanostructured MnO₂/exfoliated graphite composites

1.
Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;
2.
University of Chinese Academy of Sciences, Beijing 100049, China

Funds: Natural Science Foundation of Shanxi Province (2012011219-3); Outstanding Young Talent Fund of Institute of Coal Chemistry, Chinese Academy of Sciences.

Received Date: 2016-08-30
Accepted Date: 2016-12-26
Rev Recd Date: 2016-11-30
Publish Date: 2016-12-28

Abstract

Abstract

Nanostructured MnO₂/exfoliated graphite (EG) composites were prepared by an in-situ hydrothermal method, and were characterized by scanning electron microscopy, X-ray diffraction and thermal gravimetric analysis. Their electrochemical performance was investigated by cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy. Results show that the nanostructured MnO₂ is inserted between the EG layers, and their conductivity and electrochemical stability are significantly improved. The composites have an improved rate performance compared with the pure MnO₂. The capacitance retention rate of the composites and pure MnO₂ are 100 and 94.3% after 1000 cycles at a current density of 1 A/g, indicating that the stability of the composites is better than that of pure MnO₂.
- MnO₂,
- Hydrothermal method,
- Exfoliated graphite,
- Supercapacitor

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References(17)

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