Asymmetric Supercapacitors Based on Graphene/MnO<sub>2</sub> and Activated Carbon Nanofiber Electrodes with High Power and Energy Density
書誌事項
- 公開日
- 2011-04-20
- 権利情報
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- http://onlinelibrary.wiley.com/termsAndConditions#vor
- DOI
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- 10.1002/adfm.201100058
- 公開者
- Wiley
この論文をさがす
説明
<jats:title>Abstract</jats:title><jats:p>Asymmetric supercapacitor with high energy density has been developed successfully using graphene/MnO<jats:sub>2</jats:sub> composite as positive electrode and activated carbon nanofibers (ACN) as negative electrode in a neutral aqueous Na<jats:sub>2</jats:sub>SO<jats:sub>4</jats:sub> electrolyte. Due to the high capacitances and excellent rate performances of graphene/MnO<jats:sub>2</jats:sub> and ACN, as well as the synergistic effects of the two electrodes, such asymmetric cell exhibits superior electrochemical performances. An optimized asymmetric supercapacitor can be cycled reversibly in the voltage range of 0–1.8 V, and exhibits maximum energy density of 51.1 Wh kg<jats:sup>−1</jats:sup>, which is much higher than that of MnO<jats:sub>2</jats:sub>//DWNT cell (29.1 Wh kg<jats:sup>−1</jats:sup>). Additionally, graphene/MnO<jats:sub>2</jats:sub>//ACN asymmetric supercapacitor exhibits excellent cycling durability, with 97% specific capacitance retained even after 1000 cycles. These encouraging results show great potential in developing energy storage devices with high energy and power densities for practical applications.</jats:p>
収録刊行物
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- Advanced Functional Materials
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Advanced Functional Materials 21 (12), 2366-2375, 2011-04-20
Wiley