title: Structural and kinetic investigation of the hydride composite Ca(BH4)2 + MgH2 system doped with NbF5 for solid-state hydrogen storage.
abstract: Designing safe, compact and high capacity hydrogen storage systems is the key step towards introducing a pollutant free hydrogen technology into a broad field of applications. Due to the chemical bonds of hydrogen-metal atoms, metal hydrides provide high energy density in safe hydrogen storage media. Reactive hydride composites (RHCs) are a promising class of high capacity solid state hydrogen storage systems. Ca(BH4)2 + MgH2 with a hydrogen content of 8.4 wt% is one of the most promising members of the RHCs. However, its relatively high desorption temperature of ∼350 °C is a major drawback to meeting the requirements for practical application. In this work, by using NbF5 as an additive, the dehydrogenation temperature of this RHC was significantly decreased. To elucidate the role of NbF5 in enhancing the desorption properties of the Ca(BH4)2 + MgH2 (Ca-RHC), a comprehensive investigation was carried out via manometric measurements, mass spectrometry, Differential Scanning Calorimetry (DSC), in situ Synchrotron Radiation-Powder X-ray Diffraction (SR-PXD), X-ray Absorption Spectroscopy (XAS), Anomalous Small-Angle X-ray Scattering (ASAXS), Scanning and Transmission Electron Microscopy (SEM, TEM) and Nuclear Magnetic Resonance (NMR) techniques.
authors.affiliation: Helmholtz-Zentrum Geesthacht, Max-Planck Str. 1, 21502 Geesthacht, Germany. fahim.karimi@hzg.de.
authors.forename: Fahim
authors.initials: F
authors.lastname: Karimi
authors.forename: P Klaus
authors.initials: PK
authors.lastname: Pranzas
authors.forename: Claudio
authors.initials: C
authors.lastname: Pistidda
authors.forename: Julián A
authors.initials: JA
authors.lastname: Puszkiel
authors.forename: Chiara
authors.initials: C
authors.lastname: Milanese
authors.forename: Ulla
authors.initials: U
authors.lastname: Vainio
authors.forename: Mark
authors.initials: M
authors.lastname: Paskevicius
authors.forename: Thomas
authors.initials: T
authors.lastname: Emmler
authors.forename: Antonio
authors.initials: A
authors.lastname: Santoru
authors.forename: Rapee
authors.initials: R
authors.lastname: Utke
authors.forename: Martin
authors.initials: M
authors.lastname: Tolkiehn
authors.forename: Christian B
authors.initials: CB
authors.lastname: Minella
authors.forename: Anna-Lisa
authors.initials: AL
authors.lastname: Chaudhary
authors.forename: Stefan
authors.initials: S
authors.lastname: Boerries
authors.forename: Craig E
authors.initials: CE
authors.lastname: Buckley
authors.forename: Stefano
authors.initials: S
authors.lastname: Enzo
authors.forename: Andreas
authors.initials: A
authors.lastname: Schreyer
authors.forename: Thomas
authors.initials: T
authors.lastname: Klassen
authors.forename: Martin
authors.initials: M
authors.lastname: Dornheim