Electrochemical performance of electric double layer capacitor by addition of nano-carbon into activated carbon electrode
Nano-carbon (NC) was synthesized by arc discharge in a semi-continuous process in different medium. Electric double layer capacitors (EDLCs) were fabricated for the first time with pristine NC or the addition of NC to the activated carbon (AC) electrode as conducting material to decrease the resistance of EDLCs. The electrochemical performance of the NC/AC composite is systematically investigated using cyclic voltammetric, discharge at constant current and electrochemical impedance spectroscopic (EIS) techniques. The results showed that specific capacitance (Csp) of NC synthesized in pure N2 is bigger than that synthesized in C2H2/N2 medium and the Csp of NC from arc chamber is far bigger than that from cooling chamber while the average internal resistance (Ri) of the former are both lower than that of the latter. Field emission scanning electron microscope (FE-SEM) observation reveals that the diameter of NC from arc chamber synthesized in pure N2 medium (NCN2ArcChamber) ranges from 80 to 100 nm while the diameter of AC is in the range of 1 to 5 μm. Thus, NCN2ArcChamber is selected and added to the AC electrode. EDLC using NCN2ArcChamber/AC composite showed a lower Ri of 0.46 Ω comparison to the pure NCN2ArcChamber or AC while the Csp of NCN2ArcChamber/AC composite increased with increasing AC content in NCN2ArcChamber/AC composite. The above results show that NCN2ArcChamber might be one of the suitable conducting materials to decrease the resistance of EDLC while maintaining its higher Csp.
Nano-carbon Field emission scanning electron microscope Electric double layer capacitor Electrochemical impedance spectroscopic Specific capacitance
何孝军 滝川 浩史 郑明东 山本 真伸 蓧原 賢司 桶 真一郎
安徽工业大学,化学与化工学院,中国,安徽,243002 丰桥技术科学大学,电气电子系,日本,爱知,441-8580
国际会议
成都
英文
2007-11-19（万方平台首次上网日期，不代表论文的发表时间）