Metal-hydrogen systems with an exceptionally large and tunable thermodynamic destabilization

Peter Ngene (), Alessandro Longo, Lennard Mooij, Wim Bras and Bernard Dam
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Peter Ngene: Inorganic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University
Alessandro Longo: Istituto per lo Studio dei Materiali Nanostrutturati ISMN-CNR, Palermo
Lennard Mooij: Materials for Energy Conversion and Storage (MECS), Department of Chemical Engineering, Delft University of Technology
Wim Bras: Netherlands Organization for Scientific Research (NWO), Dutch-Belgian Beamline, ESRF—The European Synchrotron
Bernard Dam: Materials for Energy Conversion and Storage (MECS), Department of Chemical Engineering, Delft University of Technology

Nature Communications, 2017, vol. 8, issue 1, 1-8

Abstract: Abstract Hydrogen is a key element in the energy transition. Hydrogen–metal systems have been studied for various energy-related applications, e.g., for their use in reversible hydrogen storage, catalysis, hydrogen sensing, and rechargeable batteries. These applications depend strongly on the thermodynamics of the metal–hydrogen system. Therefore, tailoring the thermodynamics of metal–hydrogen interactions is crucial for tuning the properties of metal hydrides. Here we present a case of large metal hydride destabilization by elastic strain. The addition of small amounts of zirconium to yttrium leads to a compression of the yttrium lattice, which is maintained during (de)hydrogenation cycles. As a result, the equilibrium hydrogen pressure of YH2 ↔ YH3 can be rationally and precisely tuned up to five orders of magnitude at room temperature. This allows us to realize a hydrogen sensor which indicates the ambient hydrogen pressure over four orders of magnitude by an eye-visible color change.

Date: 2017
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DOI: 10.1038/s41467-017-02043-9

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