Hydrogen adsorption of carbon nanotubes grown on different catalysts

Dündar Tekkaya, Ezgi and Karatepe, Nilgün (2014) Hydrogen adsorption of carbon nanotubes grown on different catalysts. International Journal of Hydrogen Energy . ISSN 0360-3199 Published Online First http://dx.doi.org/10.1016/j.ijhydene.2014.10.145

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Single wall carbon nanotubes (SWCNTs) were synthesized by catalytic chemical vapor deposition of C2H2 at 800°C for 60 min. Catalysts were prepared by impregnation of transition metals (Fe, Co, Ni, V and bimetallic mixture of Fe-Co) on MgO powder substrate with a metal to MgO ratio of 5:100. After the synthesis, the samples were purified by liquid phase oxidation method with 1.5M HNO3 for 30 min at 210°C. The samples were characterized by thermal gravimetric analysis, scanning electron microscopy, X-ray diffraction and Raman spectroscopy. The hydrogen storage capacities of purified SWCNTs were investigated by volumetric method. It was found that the hydrogen uptake was in the range of 2.76-5.25 wt% at cryogenic temperature and 100 bar pressure. The maximum capacity was obtained with purified SWCNTs produced on Fe catalyst whereas purified SWCNTs grown on Fe-Co catalyst had the minimum hydrogen uptake.
Item Type: Article
Uncontrolled Keywords: Single wall carbon nanotubes, hydrogen storage, catalyst effect
Subjects: Q Science > QD Chemistry
Divisions: Faculty of Engineering and Natural Sciences > Academic programs > Materials Science & Eng.
Faculty of Engineering and Natural Sciences
Depositing User: Ezgi Dündar Tekkaya
Date Deposited: 22 May 2015 16:04
Last Modified: 03 Sep 2019 11:48
URI: https://research.sabanciuniv.edu/id/eprint/25976

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