Temperature dependence of capacitance in electrochemical super capacitor

Abstract

In this study, ketjen black was used for polarized electrodes instead of conventionally used acetylene black in order to improve the capacitance of activated carbon-based electric double layer capacitor (EDLC). Usually, ketjen black exhibits higher electronic conductivity compared to acetylene black, so that ketjen black could be considered as conducting filler. Moreover, N2 adsorption-desorption isotherm as well as TEM observation revealed that ketjen black used in this study has different type of pore structures compared to acetylene black. The capacitances of prepared EDLC were evaluated from discharge characteristics. It was found that the ketjen black containing EDLC showed fairly high capacitance compared to acetylene black containing one. In addition, in a temperature characteristic of EDLC which made ketjen black and acetylene black with quantity of same combination, we understood that ketjen black was superior to acetylene black. This experiment was done 50degC from 0degC in a temperature range. Ketjen black was superior to acetylene black in all temperature. It is understood that capacitance of EDLC was increased by using ketjen black.