Interface reactions and stability of a hydride composite (NaBH4 + MgH2)

Physical Chemistry Chemical Physics : PCCP
Shunsuke KatoA Züttel

Abstract

The use of the interaction of two hydrides is a well-known concept used to increase the hydrogen equilibrium pressure of composite mixtures in comparison to that of pure systems. The thermodynamics and reaction kinetics of such hydride composites are reviewed and experimentally verified using the example NaBH(4) + MgH(2). Particular emphasis is placed on the measurement of the kinetics and stability using thermodesorption experiments and measurements of pressure-composition isotherms, respectively. The interface reactions in the composite reaction were analysed by in situ X-ray photoelectron spectroscopy and by simultaneously probing D(2) desorption from NaBD(4) and H(2) desorption from MgH(2). The observed destabilisation is in quantitative agreement with the calculated thermodynamic properties, including enthalpy and entropy. The results are discussed with respect to kinetic limitations of the hydrogen desorption mechanism at interfaces. General aspects of modifying hydrogen sorption properties via hydride composites are given.

References

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Jul 21, 2006·The Journal of Physical Chemistry. B·John J VajoFlorian Mertens
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Jul 27, 2010·Physical Chemistry Chemical Physics : PCCP·Shunsuke KatoAndreas Züttel
Feb 13, 2008·Journal of Physics. Condensed Matter : an Institute of Physics Journal·C WolvertonV Ozoliņš

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Citations

Feb 22, 2017·Chemical Society Reviews·Mark PaskeviciusTorben R Jensen
Oct 11, 2016·Physical Chemistry Chemical Physics : PCCP·Kasper T MøllerTorben R Jensen
May 15, 2014·Materials·Ian D R MackinnonPeter C Talbot

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