Hydrogen Storage Behaviors of Multi-walled Carbon Nanotubes Modified by Physical Activation Process

기상활성화 표면처리된 다중벽 탄소나노튜브의 수소저장거동

  • Park, Soo-Jin (Department of chemistry, Inha university) ;
  • Lee, Seul-Yi (Department of chemistry, Inha university) ;
  • Kim, Byung-Joo (Department of nano material research, Jeonju institute of machinery and carbon composites)
  • Published : 2009.06.25

Abstract

In this work, we prepared the activated multi-walled carbon nanotubes (Acti-MWNTs) with well developed physical surface structures, high specific surface area, and higher adsorption capacity by a physical activation process, in order to enhance the hydrogen storage capacity. The Acti-MWNTs' changes in the crystalline phase and in their lattice distortions were characterized by X-ray diffraction (XRD). The textural properties of the Acti-MWNTs were investigated by a nitrogen adsorption isotherms by Brunauer-Emmett-Teller (BET) equation and Harvath-Kawazoe (H-K) calculation, respectively. The hydrogen storage capacity of the Acti-MWNTs was investigated by BEL-HP at 298 K/100 bar. The hydrogen storage capacity of the Acti-MWNTs was improved with the physical activation, resulted from the formation of new hydrogen-favorable sites on the Acti-MWNT surfaces. In conclusion, the physical activation was one of the effective method to enhance the hydrogen storage capacity of the MWNTs.

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