The effect of various acids treatment on the purification and electrochemical hydrogen storage of multi-walled carbon nanotubes |
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| Authors: | A Reyhani SZ Mortazavi A Nozad Golikand AZ Moshfegh S Mirershadi |
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| Affiliation: | aDepartment of Physics, Sharif University of Technology, P.O. Box 11155-9161, Tehran, Iran;bInstitute of Materials, P.O. Box 31485-498, Karaj, Iran;cInstitute for Nanoscience and Nanotechnology, Sharif University of Technology, Tehran, Iran |
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| Abstract: | The effects of HCl, HNO3, H2SO4 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 N2 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: H2SO4, HCl, HNO3 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. |
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| Keywords: | MWCNTs Purification Acids Electrochemical hydrogen storage |
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