English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/52809
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

A comparative study of the role of additive in the MgH2 vs. the LiBH4-MgH2 hydrogen storage system

AuthorsFernández-Camacho, A. ; Deprez, E. ; Friedrichs, O.
Issue Date2011
PublisherPergamon Press
CitationInternational Journal of Hydrogen Energy 36: 3932-3940 (2011)
AbstractThe objective of the present work is the comparative study of the behaviour of the Nb- and Ti-based additives in the MgH2 single hydride and the MgH2 + 2LiBH4 reactive hydride composite. The selected additives have been previously demonstrated to significantly improve the sorption reaction kinetics in the corresponding materials. X-Ray Diffraction (XRD), X-Ray Absorption Spectroscopy (XAS), X-Ray Photoelectron Spectroscopy (XPS) and Electron Microscopy (TEM) analysis were carried out for the milled and cycled samples in absence or presence of the additives. It has been shown that although the evolution of the oxidation state for both Nb- and Ti-species are similar in both systems, the Nb additive is performing its activity at the surface while the Ti active species migrate to the bulk. The Nb-based additive is forming pathways that facilitate the diffusion of hydrogen through the diffusion barriers both in desorption and absorption. For the Ti-based additive in the reactive hydride composite, the active species are working in the bulk, enhancing the heterogeneous nucleation of MgB2 phases during desorption and producing a distinct grain refinement that favours both sorption kinetics. The results are discussed in regards to possible kinetic models for both systems. © 2010, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
Identifiersdoi: 10.1016/j.ijhydene.2010.12.112
issn: 0360-3199
Appears in Collections:(ICMS) Artículos
Files in This Item:
File Description SizeFormat 
4-2011 digital.docx878,17 kBMicrosoft Word XMLView/Open
Show full item record
Review this work

Related articles:

WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.