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Citation: Liang Kui, Chen Ai, Feng Zhe-Sheng, Ye Zhi-Xiang. AC Impedance Analysis of Supercapacitors Utilizing Carbon Nanotube Electrodes[J]. Acta Physico-Chimica Sinica, ;2002, 18(04): 381-384. doi: 10.3866/PKU.WHXB20020420 shu

AC Impedance Analysis of Supercapacitors Utilizing Carbon Nanotube Electrodes

1.
Department of Materials Science ＆ Engineering,Sichuan University of Science ＆ Technology,Chengdu　610039;Institute of Information Materials Engineering,University of Electronic Science ＆ Technology of China,Chengdu　610054;Department of Earth Environment Science,Chengdu Institute of Information Engineering,Chengdu　610041

Received Date: 27 August 2001
Available Online: 15 April 2002

AC impedance analysis is employed to study frequencyresponse characteristics of supercapacitors utilizing carbon nanotube and activated carbon block electrodes.Charge saturation for carbon nanotube occurs at about 250 mHz,but that of activated carbon is not observed in the frequency range of 100 mHz to 100 kHz.There is a 45° line in the complex plane plot of each supercapacitor utilizing both carbon nanotube or activated carbon electrodes. Phase angles of supercapacitors with both kinds of electrodes are far smaller than 90° of pure capacitors.
- AC impedance;Carbon nanotube;Activated carbon;Frequencyresponse characteristic;Supercapacitor
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