Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 38, Issue 13, Pages 5302-5308Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2013.02.012
Keywords
Nanoconfinement; Carbon aerogel; Mg nanoparticle; Hydrogen storage
Categories
Funding
- Science and Technology Committee of Shanghai [10JC1407700, 11ZR1417600]
- 'Pujiang' project [11PJ1406000]
- Research Fund for the Doctoral Program of Higher Education of China [20100073120007]
- Shanghai Education Commission [12ZZ017]
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Magnesium nanoparticles confined in carbon aerogels were successfully synthesized through hydrogenation of infiltrated dibutyl-magnesium followed by hydrogen desorption at 623 K. The average crystallite size of Mg nanoparticle is calculated to be 19.3 nm based on X-ray diffraction analyses. TEM observations showed that the size of MgH2 particle is mainly distributed in the range from 5.0 to 20.0 nm, with a majority portion smaller than 10.0 nm. The hydrogenation and dehydrogenation enthalpies of the confined Mg are determined to be -65.1 +/- 1.56 kJ/mol H-2 and 68.8 +/- 1.03 kJ/mol H-2 by Pressure-composition-temperature tests, respectively, slightly lower than the corresponding enthalpies for pure Mg. In addition, the apparent activation energy for hydrogen absorption is determined to be 29.4 kJ/mol H-2, much lower than that of the micro-size Mg particles. These results indicate that the thermodynamic and absorption kinetic properties of confined Mg nanoparticles can be significantly improved due to the `nanosize effect'. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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