Citation: TIAN Ying, YAN Jing-Wang, XUE Rong, YI Bao-Lian. Influence of Electrolyte Concentration and Temperature on the Capacitance of Activated Carbon[J]. Acta Physico-Chimica Sinica, ;2011, 27(02): 479-485. doi: 10.3866/PKU.WHXB20110221 shu

Influence of Electrolyte Concentration and Temperature on the Capacitance of Activated Carbon

1.
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

Received Date: 24 August 2010
Available Online: 4 January 2011
Fund Project:

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.
- Supercapacitor,
- Activated carbon,
- Electrolyte concentration,
- Temperature
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沈阳化工大学材料科学与工程学院沈阳 110142