H2 storage efficiency and sorption kinetics in composite materials |
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Authors: | R Checchetto N Bazzanella P Mengucci |
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Institution: | a Dipartimento di Fisica, dell’Università di Trento, I-38050 Povo, (TN), Italy b Dipartimento di Fisica ed Ingegneria dei Materiali e Territorio, Università Politecnica delle Marche, I-60131 Ancona, Italy |
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Abstract: | We have prepared two different kinds of composite materials for hydrogen storage and studied their H2 storage capacity and desorption kinetics. The first composite material consists of magnesium-containing transition metal nanoclusters distributed in the Mg matrix (Mg:TM): this composite material shows better H2 desorption performances than pure Mg. This improvement is attributed to the role of the MgH2-TM nanocluster interface as preferential site for hexagonal Mg (h-Mg) nucleation and to the rapid formation of interconnected h-Mg domains where H diffusion during desorption occurs. The second composite material consists of LaNi5 particles (size<30 μm) distributed in a polymeric matrix. The H2 storage capacity is negligible at low metal content (50 wt%) when the metal particles are completely embedded in the polymeric matrix. The H2 storage capacity is comparable to that of the pure LaNi5 powders at high metal content (80 wt%) when a percolative distribution is assumed by the LaNi5 particles: this evidence points out the role of metal-metal interfaces and of interconnected metallic networks for H transport. |
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Keywords: | A Polymers B Phase transitions C Transport properties D Interfaces |
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