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제106회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Properties of supercapacitors made of aligned carbon nanotubes directly synthesized on carbon papers

2010년 8월 31일 11시 31분 50초
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금 15시 : 50분
재료화학 - 재료화학분야의 최신 연구동향
저자 및
고려대학교 신소재공학부, Korea
We demonstrate that vertically aligned carbon nanotubes can be synthesized directly on conductive carbon papers and used as excellent electrochemical capacitors. The carbon nanotubes were synthesized using an Al/Fe catalyst via water-assisted chemical vapor deposition. They grew as fast as ~ 100 um/min and approximately 70% of them had double walls with average diameter of ~ 6 nm. Interestingly, the carbon nanotube forest showed microscale patterns defined by the structure of underlying carbon papers. The nanotubes were attached well to the carbon papers and maintained their adhesion under mild ultrasonication in solution. Owing to the direct integration, naturally patterned structure, and good alignment, the carbon nanotubes showed excellent performance as supercapacitors. In aqueous 1 M H2SO4 solution, specific capacitance, energy, and power measured at the current density of 20 A/g were ca. 200 F/g, 20 Wh/kg, and 40 kW/kg, respectively. A specific energy of > 100 Wh/kg was achieved when organic electrolyte was used. Demonstrated facile and direct integration of carbon nanotubes on conductive substrates and their excellent electrochemical properties may hold a great promise for electrochemical energy storage applications. [The Journal of Physical Chemistry C, DOI: 10.1021/jp105498d]