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Issue 48, 2016
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Catalyzed KSiH3 as a reversible hydrogen storage material

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Solid-state hydrogen storage through the reversible formation of metallic hydrides is a key issue for the development of hydrogen as an energy vector. Herein we report the hydrogen storage performances of the KSiH3 phase ball-milled with NbF5 as a catalyst. The kinetics of hydrogen absorption/desorption are strongly enhanced by the addition of a catalyst as revealed by the large decrease of activation energies for both the absorption and desorption reactions. No disproportionation phenomenon is observed, indicating that the reaction between KSiH3 and KSi is perfectly reversible with a hydrogen storage capacity of 4.1 wt% H2. The thermodynamic properties of this KSi/KSiH3 equilibrium were investigated by plotting PCI curves from 90 °C to 130 °C: an enthalpy of 24.3 kJ mol−1 H2 and a low entropy change of 59.5 J K−1 mol−1 H2 are found. This low entropy variation is related to the high mobility of the H atoms in the α-KSiH3 phase as recently demonstrated by Quasi-Elastic Neutron Scattering (QENS) experiments.

Graphical abstract: Catalyzed KSiH3 as a reversible hydrogen storage material

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The article was received on 01 Sep 2016, accepted on 09 Nov 2016 and first published on 09 Nov 2016

Article type: Paper
DOI: 10.1039/C6TA07563K
Citation: J. Mater. Chem. A, 2016,4, 19045-19052
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    Catalyzed KSiH3 as a reversible hydrogen storage material

    R. Janot, W. S. Tang, D. Clémençon and J.-N. Chotard, J. Mater. Chem. A, 2016, 4, 19045
    DOI: 10.1039/C6TA07563K

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