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Citation: SUN Guo-Hua, LI Kai-Xi, FAN Hui, GU Jian-Yu, LI Qiang, LIU Yue. Eelectrochemical Performance of Capacitors Using [BMIm]BF₄/Fc as Electrolyte[J]. Acta Physico-Chimica Sinica, ;2008, 24(01): 103-108. doi: 10.3866/PKU.WHXB20080118 shu

Eelectrochemical Performance of Capacitors Using [BMIm]BF₄/Fc as Electrolyte

1.
Key Laboratory for Carbon Materials, Shanxi Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, P. R. China; Graduate School of the Chinese Academy of Sciences, Beijing 100049, P. R. China

Received Date: 23 August 2007
Available Online: 27 November 2007

The electrochemical behaviors of ferrocene (Fc)-containing ionic liquid [BMIm]BF4 were investigated in a system, which used ferrocene-containing ionic liquid as electrolyte, porous carbon as electrode materials. The cyclic voltammetry and constant current charge-discharge results indicated that redox reaction of Fc happened in the porous carbon, and which was a diffusion-controlled, highly reversible redox reaction. The average specific capacitance of 0.01 mol·L-1 [BMIm]BF4/Fc at a current density of 1 mA·cm-2 was 163 F·g-1, 63% higher than that of pure [BMIm]BF4. The increase of average specific capacitance indicates that the faradic pseudocapacitance associated with Fc species in the redox reactions has a considerable contribution to the total capacitance of ECs (electrochemical capacitors). At the same time, it shows a power density of 400 W·kg-1 as well as energy density of 37.5 Wh·kg-1 approaching the level of a practical battery.
- Ionic liquid; Electrochemical capacitors; Faradic pseudocapacitance; Redox
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沈阳化工大学材料科学与工程学院沈阳 110142

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Eelectrochemical Performance of Capacitors Using [BMIm]BF4/Fc as Electrolyte

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Eelectrochemical Performance of Capacitors Using [BMIm]BF₄/Fc as Electrolyte