Per citar aquest document: http://ddd.uab.cat/record/126456
Sorption properties and reversibility of Ti(IV) and Nb(V)-fluoride doped-Ca(BH4)2-MgH2 system
Bonatto Minella, Christian (Institut für Festkörper- und Werkstofforschung Dresden)
Garroni, Sebastiano (Università degli Studi di Sassari. Dipartimento di Chimica e Farmacia)
Pistidda, Claudio (Helmholtz-Zentrum Geesthacht. Das Institut für Werkstoffforschung)
Baró, M. D. (Universitat Autònoma de Barcelona. Departament de Física)
Gutfleisch, Oliver (Technische Universität Darmstadt. Fachgebiete Materialwissenschaft)
Klassen, Thomas (Helmholtz-Zentrum Geesthacht. Das Institut für Werkstoffforschung)
Dornheim, Martin (Helmholtz-Zentrum Geesthacht. Das Institut für Werkstoffforschung)

Data: 2015
Resum: In the last decade, alkaline and alkaline earth metal tetrahydroborates have been the focuses of the research due to their high gravimetric and volumetric hydrogen densities. Among them, Ca(BH4)2 and the Ca(BH4)2 + MgH2 reactive hydride composite (RHC), were calculated to have the ideal thermodynamic properties which fall within the optimal range for mobile applications. In this study, the addition of NbF5 or TiF4 to the Ca(BH4)2 + MgH2 reactive hydride composite system was attempted aiming to obtain a full reversible system with the simultaneous supression of CaB12H12. Structural characterization of the specimens was performed by means of in-situ Synchroton Radiation Power X-ray diffraction (SR-PXD) and 11B {1H} Solid State Magic Angle Spinning-Nuclear Magnetic Resonance (MAS-NMR). The evolution of the chemical state of the Nb- and Ti-based additives was monitored by X-ray Absorption Near Edge Structure (XANES). The addition of NbF5 or TiF4 to the Ca(BH4)2 + MgH2 system have not supressed completely the formation of CaB12H12 and only a slight improvement concerning the reversible reaction was displayed just in the case of Nb-doped composite material.
Drets: Tots els drets reservats
Llengua: Anglès
Document: article ; recerca ; acceptedVersion
Matèria: Hydrogen storage ; Transition metal fluorides ; Tetrahydroborate ; Ins-situ Synchronton Radiation Powder X-ray diffraction (SR-PXD) ; X-ray Absorption Near Edge Structure (XANES) ; 11B {1H} Solid State Magic Angle Spinning-Nuclear Magnetic Resonance (MAS-NMR)
Publicat a: Journal of alloys and compounds, Vol. 622 (Feb. 2015) , p. 989-994, ISSN 0925-8388

DOI: 10.1016/j.jallcom.2014.11.038


Post-print
26 p, 1.3 MB

El registre apareix a les col·leccions:
Documents de recerca > Documents dels grups de recerca de la UAB > Centres i grups de recerca (producció científica) > Ciències > Grup de nanoenginyeria de materials, nanomagnetisme i nanomecànica (Gnm3)
Articles > Articles de recerca
Articles > Articles publicats

 Registre creat el 2014-11-20, darrera modificació el 2016-09-05



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