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Acta Physico-Chimica Sinica  2011, Vol. 27 Issue (02): 479-485    DOI: 10.3866/PKU.WHXB20110221
ELECTROCHEMISTRY AND NEW ENERGY     
Influence of Electrolyte Concentration and Temperature on the Capacitance of Activated Carbon
TIAN Ying1,2, YAN Jing-Wang1, XUE Rong1, YI Bao-Lian1
1. Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning Province, P. R. China;
2. College of Environmental and Chemical Engineering, Dalian Jiaotong University, Dalian 116028, Liaoning Province, P. R. China
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Abstract  

The influences of electrolyte concentration and temperature on the capacitive behavior of activated carbon (AC) were investigated by cyclic voltammetry, electrochemical impedance spectroscopy, and galvanostatic charge/discharge measurements. The performance of a symmetric capacitor was characterized in 0.1, 0.5, 1.0, and 6.0 mol·L-1 KOH solution. We found that the high electrolyte concentration led to high capacitance, low internal resistance, and a narrow voltage window. The capacitance and internal resistance were found to be linearly dependent on the logarithm of KOH concentration. AC supercapacitor performance was investigated at 20, 40 and 80 °C, respectively. We found that elevated temperatures are favorable for an increase in capacitance and for a decrease in internal resistance. However, elevated temperatures increase the capacitance fading rate during long charge/discharge cycling tests.



Key wordsSupercapacitor      Activated carbon      Electrolyte concentration      Temperature     
Received: 24 August 2010      Published: 04 January 2011
MSC2000:  O646  
Fund:  

The project was supported by the Important Directional Project of ‘The Research and Exploration of Supercapacitor Storage System for Electric Vehicle’ from Dalian Institute of Chemical Physics, Chinese Academy of Sciences, China.

Corresponding Authors: YAN Jing-Wang     E-mail: yanjw@dicp.ac.cn
Cite this article:

TIAN Ying, YAN Jing-Wang, XUE Rong, YI Bao-Lian. Influence of Electrolyte Concentration and Temperature on the Capacitance of Activated Carbon. Acta Physico-Chimica Sinica, 2011, 27(02): 479-485.

URL:

http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB20110221     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2011/V27/I02/479

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