Hydrogen sorption properties of magnesium particles decorated with metallic nanoparticles as catalyst
Language
en
Article de revue
This item was published in
Journal of Alloys and Compounds. 2009, vol. 476, n° 1-2, p. 152-159
Elsevier
English Abstract
Both hydrogen absorption and desorption, in the range 200–300 and 260–330 °C, respectively, of magnesium particles decorated with metallic nanoplots elaborated by Supercritical Fluid Chemical process are studied. The ...Read more >
Both hydrogen absorption and desorption, in the range 200–300 and 260–330 °C, respectively, of magnesium particles decorated with metallic nanoplots elaborated by Supercritical Fluid Chemical process are studied. The absorption data are fitted using Avrami–Erofeev model to first order. Unexpectively, magnesium decorated with copper nanoparticles lead to relatively high rates of sorption (absorption rate at 300 °C and desorption rate at 330 °C of about 0.4 wt%H min<sup>−1</sup>) but its activation energy remains high (70 kJ mol<sup>−1</sup>). The presence at the interface of MgCu<sub>2</sub>, acting as a chemical link between the nanoCu and the magnesium particle could be responsible for such behavior. Palladium nanoparticles react with magnesium during cycling so that the catalytic effect is decreasing with cycling and finally does not exist anymore after 10 cycles. Finally, the best results are obtained for the nanocomposite of magnesium with nickel nanoparticles for which the sorption rates are comparable with the ones obtained for optimized BM samples with catalysts, but with a lower energy cost of the process.Read less <
English Keywords
Nanoparticles
Magnesium
Supercritical fluid chemical deposition
Hydrogen sorption
Kinetics
Origin
Hal imported