A hydride composite featuring mutual destabilisation and reversible boron exchange: Ca(BH4)2–Mg2NiH4

N. Bergemann; C. Pistidda; C. Milanese; M. Aramini; S. Huotari; P. Nolis; A. Santoru; M. R. Chierotti; A.-L. Chaudhary; M. D. Baro; T. Klassen; M. Dornheim

doi:10.1039/C8TA04748K

A hydride composite featuring mutual destabilisation and reversible boron exchange: Ca(BH₄)₂–Mg₂NiH₄†

N. Bergemann,^a C. Pistidda,

*^a C. Milanese,^b M. Aramini,^cd S. Huotari,^c P. Nolis,

^e A. Santoru,

^a M. R. Chierotti,

^f A.-L. Chaudhary,

^a M. D. Baro,^g T. Klassen^ah and M. Dornheim^a

Author affiliations

* Corresponding authors

^a Institute of Materials Research, Materials Technology, Helmholtz-Zentrum Geesthacht GmbH, Max-Planck-Straße 1, Geesthacht, Germany
E-mail: claudio.pistidda@hzg.de

^b Pavia Hydrogen Lab, CSGI and Università di Pavia, Dipartimento di Chimica, Sezione di Chimica Fisica, Viale Taramelli, 16, Pavia, Italy

^c Department of Physics, University of Helsinki, P. O. Box 64, FI-00014 Helsinki, Finland

^d ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, UK

^e Servei de Ressonància Magnètica Nuclear, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, Spain

^f Department of Chemistry and NIS Centre, University of Torino, Via P. Giuria 7, Torino, Italy

^g Departament de Física, Facultat de Ciències, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Cerdanyola del Vallès, Barcelona, Spain

^h Helmut Schmidt University, Institute of Materials Technology, Hamburg, Germany

Abstract

The system Ca(BH₄)₂–Mg₂NiH₄ is used as a model to prove the unique possibility to fully reverse the borohydride decomposition process even in cases where the decomposition reaction leads to undesired stable boron containing species (boron sinks). The formation of MgNi_2.5B₂ directly from Ca(BH₄)₂ or from CaB₁₂H₁₂ and amorphous boron allows an unexpectedly easy transfer of the boron atoms to reversibly form Ca(BH₄)₂ during rehydrogenation. In addition, to the best of our knowledge, the mutual destabilisation of the starting reactants is observed for the first time in Ca(BH₄)₂ based Reactive Hydride Composite (RHC) systems. A detailed account of dehydrogenation and rehydrogenation reaction mechanisms as the function of applied experimental conditions is given.

Journal of Materials Chemistry A

A hydride composite featuring mutual destabilisation and reversible boron exchange: Ca(BH₄)₂–Mg₂NiH₄†

Abstract

Supplementary files

Article information

Download Citation

Permissions

A hydride composite featuring mutual destabilisation and reversible boron exchange: Ca(BH₄)₂–Mg₂NiH₄

Social activity

Search articles by author

Spotlight

Advertisements

Journal of Materials Chemistry A