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How to Assess the Relative Volume Change of Reversible Metal Hydrides Easily, Speedily and Concisely (Enough) with a Surprising Relevance for Clarifying Thermodynamic Tailoring Effects

preprint
submitted on 17.11.2019, 21:37 and posted on 26.11.2019, 03:42 by Roland Hermann Pawelke

A practical way for assessing the relative volume change of reversible metal hydrides upon hydrogenation, based on the van’t Hoff reaction parameters, is outlined. Hitherto computational methods can provide that information only at a much higher level of complexity. By that method, the open issue of assessing the minimum pressure for complete [AlH4]-formation in Ti-doped NaAlH4 is resolved and the nature of the additional reaction pathway in KH/Ti-co-doped NaAlH4 elucidated. This work summarizes the essentials for the thermodynamic tailoring of metal hydrides in nine points and adds thus a central missing piece to the puzzle of understanding reversible chemical hydrogen storage in metal hydrides.

Funding

ESA Contract No. 4000105330/12/NL/CLP

History

Email Address of Submitting Author

roland.pawelke@hushmail.com

Institution

FOTEC Forschungs- und Technologietransfer GmbH

Country

Austria

ORCID For Submitting Author

0000-0002-6944-2240

Declaration of Conflict of Interest

There are no conflicts to declare.

Version Notes

V1: Initial Version

Exports