电解质浓度和温度对活性炭电容性能的影响

doi:10.3866/PKU.WHXB20110221

Abstract

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 words: Supercapacitor, Activated carbon, Electrolyte concentration, Temperature

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

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

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