Structural and kinetic investigation of the hydride composite Ca(BH4)2 + MgH2 system doped with NbF5 for solid-state hydrogen storage

Fahim Karimi; P. Klaus Pranzas; Claudio Pistidda; Julián A. Puszkiel; Chiara Milanese; Ulla Vainio; Mark Paskevicius; Thomas Emmler; Antonio Santoru; Rapee Utke; Martin Tolkiehn; Christian B. Minella; Anna-Lisa Chaudhary; Stefan Boerries; Craig E. Buckley; Stefano Enzo; Andreas Schreyer; Thomas Klassen; Martin Dornheim

doi:10.1039/C5CP03557K

Structural and kinetic investigation of the hydride composite Ca(BH₄)₂ + MgH₂ system doped with NbF₅ for solid-state hydrogen storage†

Fahim Karimi,*^a P. Klaus Pranzas,^a Claudio Pistidda,^a Julián A. Puszkiel,^ab Chiara Milanese,^c Ulla Vainio,^ad Mark Paskevicius,^e Thomas Emmler,^a Antonio Santoru,^a Rapee Utke,^af Martin Tolkiehn,^d Christian B. Minella,^a Anna-Lisa Chaudhary,^a Stefan Boerries,^a Craig E. Buckley,^e Stefano Enzo,^g Andreas Schreyer,^a Thomas Klassen^a and Martin Dornheim^a

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* Corresponding authors

^a Helmholtz-Zentrum Geesthacht, Max-Planck Str. 1, 21502 Geesthacht, Germany
E-mail: fahim.karimi@hzg.de
Fax: +49 415287527
Tel: +49 4152872687

^b Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) and Centro Atómico Bariloche – Av. Bustillo 9500, R8402AGP, S. C. de Bariloche, Río Negro, Argentina

^c Pavia Hydrogen Lab, C.S.G.I. & Chemistry Department, Physical Chemistry Section, University of Pavia, Viale Taramelli, 16, 27100 Pavia, Italy

^d HASYLAB at DESY, Notkestraße 85, D-22603 Hamburg, Germany

^e Department of Imaging and Applied Physics, Curtin University, Perth WA 6845, Australia

^f School of Chemistry, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand

^g Nanosized Materials and Mechanochemistry, Department of Chemistry and Pharmacy, University of Sassari, Via Vienna 2, 07100 Sassari, Italy

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.

Physical Chemistry Chemical Physics

Structural and kinetic investigation of the hydride composite Ca(BH₄)₂ + MgH₂ system doped with NbF₅ for solid-state hydrogen storage†

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Structural and kinetic investigation of the hydride composite Ca(BH₄)₂ + MgH₂ system doped with NbF₅ for solid-state hydrogen storage

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Physical Chemistry Chemical Physics