Hydrogen storage in sonicated carbon materials |
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Authors: | M. Hirscher M. Becher M. Haluska U. Dettlaff-Weglikowska A. Quintel G.S. Duesberg Y.-M. Choi P. Downes M. Hulman S. Roth I. Stepanek P. Bernier |
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Affiliation: | Max-Planck-Institut für Metallforschung, Heisenbergstr. 1, 70569 Stuttgart, Germany, DE Max-Planck-Institut für Festk?rperforschung, Heisenbergstr. 1, 70569 Stuttgart, Germany, DE GDPC, University of Montpellier II, 34095 Montpellier cedex 05, France, FR
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Abstract: | The hydrogen storage in purified single-wall carbon nanotubes (SWNTs), graphite and diamond powder was investigated at room temperature and ambient pressure. The samples were sonicated in 5 M HNO3 for various periods of time using an ultrasonic probe of the alloy Ti-6Al-4V. The goal of this treatment was to open the carbon nanotubes. The maximum value of overall hydrogen storage was found to be 1.5 wt %, as determined by thermal desorption spectroscopy. The storage capacity increases with sonication time. The sonication treatment introduces particles of the Ti alloy into the samples, as shown by X-ray diffraction, transmission electron microscopy, and chemical analysis. All of the hydrogen uptake can be explained by the assumption that the hydrogen is only stored in the Ti-alloy particles. The presence of Ti-alloy particles does not allow the determination of whether a small amount of hydrogen possibly is stored in the SWNTs themselves, and the fraction of nanotubes opened by the sonication treatment is unknown. Received: 18 December 2000 / Accepted: 18 December 2000 / Published online: 9 February 2001 |
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Keywords: | PACS: 61.64.+w 68.43.Vx 84.60.Ve |
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