The Master Key to the Problem of Reversible Chemical Hydrogen Storage is 12 kJ (mol H2)-1

24 May 2019, Version 7
This content is a preprint and has not undergone peer review at the time of posting.

Abstract

This article outlines a potent theoretical formalism illuminating the boundaries to reversible solid hydrogen storage based on the ideal gas law and classic equilibrium thermodynamics. A global picture of chemical reversible hydrogen sorption is unveiled including a thermodynamic explanation of partial reversibility. This is utilized to elucidate a multitude of issues from metal hydride chemistry: Highlights are why the substitution of a mere 4 mol % Na by K in Ti-doped NaAlH4 raises the reversible storage capacity by 42 % and elaboration of the reaction pathway in (Rb/K)H-doped Mg(NH2)2/2LiH. The findings of this work allow for a change of paradigm towards the understanding of reversible chemical energy storage and provide a hitherto missing tool of ample analytic and predictive power, complementary to experiment.

Keywords

Reversible Hydrogen Storage Capacity
Equilibrium thermodynamics
Hydrogen Energy Storage
hydrogen storage issues
Metal Hydrides Reaction
hydrogen storage materials
metal hydrides

Supplementary materials

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