Journal
JOURNAL OF POWER SOURCES
Volume 183, Issue 1, Pages 92-97Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2008.04.057
Keywords
Mg-based metal hydride; carbon nanotubes; hydrogen storage; dehydrogenation; nanocomposites
Funding
- National Science Council of the Republic of China [NSC 96-2221-E-155-055-MY2]
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This study investigated the hydrogenation and dehydrogenation behavior Of Mg2Co nanoparticles and carbon nanotube (CNT) composites using temperature-programmed deposition, Raman spectroscopy, and X-ray diffraction (XRD). We used the mechanical alloying method to prepare nanosized Mg2Co particles on CNTs with three loadings of alloys. The introduction of CNTs showed dehydrogenation, hydrogen desorption Starting at 370 degrees C, with the majority of hydrogen being below 500 degrees C. This can be explained by the fact that Mg2Co alloy deposited on CNT surface induced the dissociation of hydrogen into two atoms, which were spilt over and then intercalated into the interlayer of CNT. Accordingly, the atomic intercalation enabled the reduction of the hydrogen desorption activation barrier. The spillover mechanism of hydrogen storage can be confirmed by XRD and Raman spectroscopy because of larger interspacing (d(002)) and weaker graphite degree (I-D/I-G) of CNTs after hydrogenation. (C) 2008 Elsevier B.V. All rights reserved.
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