The effect of various acids treatment on the purification and electrochemical hydrogen storage of multi-walled carbon nanotubes

The effects of HCl, HNO 3, H 2SO 4 and HF acids on the purification and the electrochemical hydrogen storage of multi-walled carbon nanotubes (MWCNTs) were studied. The MWCNTs were synthesized on Fe–Ni catalyst by thermal chemical vapor deposition method. The X-ray diffraction and thermal gravimetri...

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Bibliographic Details
Published in:Journal of power sources 2008-09, Vol.183 (2), p.539-543
Main Authors: Reyhani, A., Mortazavi, S.Z., Nozad Golikand, A., Moshfegh, A.Z., Mirershadi, S.
Format: Article
Language:English
Subjects:
Acids
Alternative fuels. Production and utilization
Applied sciences
Catalysts
Diffraction
Electrochemical hydrogen storage
Energy
Exact sciences and technology
Fuels
Hydrogen
Hydrogen storage
Iron
Multi wall carbon nanotubes
MWCNTs
Purification
Surface area
Surface chemistry
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Summary:The effects of HCl, HNO 3, H 2SO 4 and HF acids on the purification and the electrochemical hydrogen storage of multi-walled carbon nanotubes (MWCNTs) were studied. The MWCNTs were synthesized on Fe–Ni catalyst by thermal chemical vapor deposition method. The X-ray diffraction and thermal gravimetric analysis results indicated that the MWCNTs purified by HF acid had the highest impurities as compared with the other acids. The N 2 adsorption results at 77 K indicated that all the samples were mainly mesoporous and the purified MWCNTs by HF acid had the highest surface area as compared with the other acids. The hydrogen storage capacities of the purified MWCNTs by the following acids were in ascending order as: H 2SO 4, HCl, HNO 3 and HF. It was found that the 1–2 nm micropores in the MWCNTs are very important for hydrogen storage. Further, the presences of catalyst and defective sites in MWCNTs influence the hydrogen storage capacity.
ISSN:0378-7753
1873-2755
DOI:10.1016/j.jpowsour.2008.05.039