Journal of Energy Engineering (에너지공학)

The Korean Society for Energy (한국에너지학회)
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Hydrogen storage of multiwall carbon nanotube decorated with bimetallic Pt-Pd nano catalysts using thermal vapor deposition

Pt 및 Pd 2금속 나노촉매를 증착한 탄소나노튜브의 수소저장특성 연구

  • Hwang, Sang-Woon (School of Chemical Engineering, Chonbuk National University) ;
  • So, Chang-Su (Department of Hydrogen and Fuel Cells Engineering, Specialized Graduate School, Chonbuk National University) ;
  • Naik, Mehraj-Ud-Din (School of Chemical Engineering, Chonbuk National University) ;
  • Nahm, Kee-Suk (School of Chemical Engineering, Chonbuk National University)
  • 황상운 (전북대학교 반도체 화학공학) ;
  • 소창수 (전북대학교 수소연료전지 특성화대학원) ;
  • ;
  • 남기석 (전북대학교 반도체 화학공학)
  • Published : 2009.06.30
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Abstract

In present work, we study the hydrogen storage of MWNT decorated with bimetallic Pt and Pd nanosize catalysts by Thermal Vapor Deposition [TVD]. The size of Pt and Pd particles is controlled as 5nm, 3nm, respectively by TVD. Before hydrogen storage measurement, the sample was heated for 1hr at $200^{\circ}C$ in H2 atmosphere. The Hydrogen sto rage of the sample was performed at room temperature and 33~34atm. The hydrogen storage of this composite showed 3.2wt% at 298K and 34atm, for three times. At 4th cycle, hydrogen storage is decreased to 1.5wt%, owing to the aggregation of bimetallic Pt and Pd nano particles.

본 연구에서는 열화학증착법을 이용하여Pt 및 Pd 전이금속 촉매를 각각 5nm, 3nm로 탄소나노튜브에 증착하여 수소저장특성을 연구하였다. 제작한 시료를 수소분위기에서 $200^{\circ}C$의 조건에서 1시간동안 열처리한 후 $25^{\circ}C$, 33~34atm의 조건에서 수소저장량을 측정하였다. 이 조건에서 수소저장량은 3.2wt%로 나타났고 동일 조건에서 반복 수행결과 수소저장과 탈착을 반복하여도 3.1wt%의 저장량을 보여 수소저장량의 변화가 거의 없음을 관찰하였다. 그러나 4번째 저장cycle이후에는 수소저장량이 1.5wt%로 급격히 감소하였다. 이는 증착된 전이금속촉매의 조대화로 인해 저장량이 감소함을 확인하였다. 실험결과를 근거로 Pt 및 Pd 2금속을 증착한 탄소나노튜브의 수소저장메커니즘을 제시하였다.

Keywords

References

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