2019 年 2019 巻 289 号 p. 139-147
Ketjenblack (KB), which is a mesoporous carbon black, can be used as electrode active material for an electric double layer capacitor (EDLC). This paper addresses the capacitance properties of the activated KB with a high specific surface area as the electrode active material. The mesopore volume in KB was decreased by KOH-activation, while the micropores were developed to increase the specific surface area. As a result, the KOH-activated KB showed a higher volumetric capacitance as an EDLC electrode compared with the pristine KB. Additionally, it was also shown that the nitrogen-doping of the KOH-activated KB by nitrogen-monoxide produces a better volumetric capacitance and an ability to tolerate high voltages compared to the pristine KB electrode.