Influence on capacitance of EDLC by a functional group of a conductive material

In this research, high-capacity once electric double layer capacitor (EDLC) was targeted, influence on capacitance by quantity of functional group of Ketjen black as the conductive materials of the polarized electrode was examined. Existence of an oxygen functional group on the surface of carbon electrode in EDLC is connected to capacitance increasing with faraday reaction and improvement of wettability of a water solution electrolyte to an electrode. Therefore, the EDLC was evaluated with different Ketjen black of quantity of functional group. As the result, wettability of a water solution electrolyte to an electrode was improved by increase of a functional group, and osmosis of an ion became good, and the capacitance was increased. In addition, an ion was adsorbed at the deep of a pore by the removal of a functional group, and capacitance was increased.