纳米MnO<sub>2</sub>/膨胀石墨复合材料的制备及其电化学性能

徐德芳; 宋燕; 田晓冬; 王凯; 郭全贵; 刘朗

纳米MnO₂/膨胀石墨复合材料的制备及其电化学性能

徐德芳^1,2,
宋燕^2,,
田晓冬^1,2,
王凯^1,2,
郭全贵²,
刘朗²

1.
中国科学院山西煤炭化学研究所, 炭材料重点实验室, 山西太原 030001;
2.
中国科学院大学, 北京 100049

基金项目: 山西省自然科学基金（2012011219-3）；中国科学院山西煤炭化学研究所杰出青年人才项目.

详细信息

作者简介:
徐德芳,硕士研究生.E-mail:fang12339@163.com

通讯作者:
宋燕,研究员.E-mail:yansong1026@126.com

中图分类号: TB333
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- 被引次数: 0
出版历程
- 收稿日期: 2016-08-30
- 录用日期: 2016-12-26
- 修回日期: 2016-11-30
- 刊出日期: 2016-12-28

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.

摘要

摘要: 采用水热法原位合成二氧化锰（MnO₂）/膨胀石墨（EG）复合材料，利用扫描电子显微镜（SEM）、x-射线衍射仪（XRD）、热重分析仪（TGA）对材料进行表征，并将所制MnO₂/EG复合材料（MEG）作为超级电容器电极，采用循环伏安、恒电流充放电和交流阻抗谱等方法进行电化学性能测试。结果表明，纳米MnO₂沉积填充在EG中，提高了材料导电性和稳定性；与纯MnO₂相比，复合材料不但具有较高的倍率性能，而且在1 000次循环后电容保持率高达100%。
- 二氧化锰 /
- 水热法 /
- 膨胀石墨 /
- 超级电容器
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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参考文献(17)

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