Back to Search Start Over

Hydrogen storage properties of as-synthesized and severely deformed magnesium – multiwall carbon nanotubes composite

Hydrogen storage properties of as-synthesized and severely deformed magnesium – multiwall carbon nanotubes composite

Authors :
Skripnyuk, V.M.
Rabkin, E.
Bendersky, L.A.
Magrez, A.
Carreño-Morelli, E.
Estrin, Y.
Source :
International Journal of Hydrogen Energy. Jun2010, Vol. 35 Issue 11, p5471-5478. 8p.
Publication Year :
2010

Abstract

Abstract: We prepared a Mg-2 mass % multiwall carbon nanotubes composite employing a powder metallurgy technique. The kinetics of hydrogen absorption/desorption of the as-synthesized composite was much faster than that of reference samples of pure Mg. The pressure-composition isotherm (measured at 300 °C) of the as-synthesized composite exhibited no measurable pressure hysteresis, with the equilibrium hydrogen pressures in the plateau region being higher than those of pure Mg by a factor of up to 1.8. Equal channel angular pressing of the as-synthesized composite led to a slow down of the absorption/desorption processes at the initial stages of the processes, and to their acceleration at the later stages. We suggested that the mechanism responsible for the good kinetic performance of the as-synthesized composite was fast diffusion of hydrogen through the cores of carbon nanotubes. We put forward a hypothesis relating the increase in equilibrium hydrogen pressure in the as-synthesized composite to the elastic constraints imposed by carbon nanotubes on the Mg matrix. [Copyright &y& Elsevier]

Details

Language :
English
ISSN :
03603199
Volume :
35
Issue :
11
Database :
Academic Search Index
Journal :
International Journal of Hydrogen Energy
Publication Type :
Academic Journal
Accession number :
50933381
Full Text :
https://doi.org/10.1016/j.ijhydene.2010.03.047