한국재료학회지 제32권 제5호 (p.270-279)

전기이중층 커패시터용 질소/황이 동시에 도핑된 탄소 펠트의 제조 및 전기화학적 성능 평가

Fabrication and Electrochemical Characterization of N/S co-doped Carbon Felts for Electric Double-Layer Capacitors
키워드 :
carbon felt,thiourea,electric double-layer capacitor,electrode,doping.

목차

Abstract
1. 서 론
2. 실험 및 분석 방법
3. 결과 및 고찰
4. 결 론
Acknowledgement
References

초록

In this study, N/S co-doped carbon felt (N/S-CF) was prepared and characterized as an electrode material for electric double-layer capacitors (EDLCs). A commercial carbon felt (CF) was immersed in an aqueous solution of thiourea and then thermally treated at 800 oC under an inert atmosphere. The prepared N/S-CF showed a large specific surface area with hierarchical pore structures. The electrochemical performance of the N/S-CF-based electrode was evaluated using both 3- electrode and 2-electrode systems. In the 3-electrode system, the N/S-CF-based electrode showed a good specific capacitance of 177 F/g at 1 A/g and a good rate capability of 41% at 20 A/g. In the 2-electrode system (symmetric capacitor), the freestanding N/S-CF-based electrode showed a specific capacitance of 275 mF/cm2 at 2 mA/cm2, a rate capability of 62.5 % at 100 mA/cm2, a specific power density of ~ 25,000 mW/cm2 at an energy density of 23.9 mWh/cm2, and a cycling stability of ~ 100 % at 100 mA/cm2 after 20,000 cycles. These results indicate the N/S co-doped carbon felts can be a promising candidate as a new electrode material in a symmetric capacitor.