# Multi-wall 탄소나노튜브의 수소 저장 특성

• Hwang, J.Y. (Hydrogen Energy Research Center, Korea Institute of Energy Research) ;
• Lee, S.H. (Hydrogen Energy Research Center, Korea Institute of Energy Research) ;
• Sim, K.S. (Hydrogen Energy Research Center, Korea Institute of Energy Research) ;
• Kim, J.W. (Hydrogen Energy Research Center, Korea Institute of Energy Research)
• 황준연 (한국에너지기술연구원 수소에너지연구센터) ;
• 이상호 (한국에너지기술연구원 수소에너지연구센터) ;
• 심규성 (한국에너지기술연구원 수소에너지연구센터) ;
• 김종원 (한국에너지기술연구원 수소에너지연구센터)
• Published : 2001.03.15

#### Abstract

Carbon nanotubes were prepared by catalytic decomposition of $CH_4$ using Ni-MgO catalyst at various temperatures. $H_2$ effect on crystallinity and morphology during the synthesis of carbon nanotubes was investigated. The crystallinity and morphology were characterized by SEM, TEM, XRD, TGA, and Raman spectroscopy. In addition, the hydrogen adsorption properties were evaluated by PCT measurement in a hydrogen pressure range between 1 and 120 bar. The optimal synthesis temperature of carbon nanotubes was elevated in the presence of $H_2$, although significant difference of carbon nanotube morphology was not found. It is believed that hydrogen served as self-cleaner mops the amorphous carbon on the catalyst surface. It is proved that the carbon nanotubes have multi-walled structure, short length with a outer diameter of 20 ~40nm and open tips after elimination of the catalyst. The amount of hydrogen adsorbed in carbon nanotubes is increased as the pressure of hydrogen is increased and reaches 1.3 wt % under the hydrogen pressure of 120 bar at room temperature.

#### Acknowledgement

Supported by : 공공기술연구회