Microstructural and kinetic investigation of hydrogen sorption reaction of MgH2/Nb2O5 Nanopowders

TitleMicrostructural and kinetic investigation of hydrogen sorption reaction of MgH2/Nb2O5 Nanopowders
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2009
AuthorsAurora, A., Mancini M.R., Mirabile Gattia Daniele, Montone A., Pilloni L., Todini E., and Antisari M.V.
JournalMaterials and Manufacturing Processes
KeywordsCatalysts, Desorption, Excellent performance, Hydrogen, Hydrogen delivery, Hydrogen sorption, Hydrogen storage, Kinetic investigations, Magnesium, Magnesium hydride, Mechanical alloying, Mechanical milling, Micro-structural, Milling (machining), Nano powders, Nanometrics, Niobium, Niobium oxide, Reaction kinetics, Scanning electron microscopy, Thermal gravimetric analysis, Thermogravimetric analysis, X ray diffraction, X ray powder diffraction

MgH2/Nb2O5 composite is one of the most promising candidates for the hydrogen delivery. The performances of these materials are usually improved by mechanical milling because a finer distribution of the catalyst and the induction of defects on the particles accelerate the hydrogen sorption kinetic of the powders. Aiming at elucidating the factors responsible for this improvement, the effect on the reaction kinetics induced by nanometric and micrometric Nb2O5 powders has been investigated by a Sievert type apparatus. Nanometric additive imparts excellent performances in comparison to the micrometric one. The activation of the sample by sorption cycling has been investigated. In order to elucidate the role of the catalyst, a metallographic study of partially desorbed MgH2/Nb2O5 composite has been applied for the first time. The powders have been also characterized by X-ray diffraction and thermal gravimetric analysis.


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