Magnesium gasar as a potential monolithic hydrogen absorbent

Author(s)
Grzegorz Boczkal, Malwina Janoska, Daria Setman, Erhard Schafler, Piotr Dlugosz, Pawel Darlak
Abstract

The study focuses on the aspect of using the structure of gasars, i.e. materials with directed open porosity, as a potential hydrogen storage. The structure of the tested gasar is composed of a large number of thin, open tubular pores running through the entire longitudinal section of the sample. This allows hydrogen to easily penetrate into the entire sample volume. The analysis of pore distribution showed that the longest diffusion path needed for full penetration of the metal structure with hydrogen is about L = 50–70 μm, regardless of the external dimensions of the sample. Attempts to hydrogenate the magnesium gasar structure have shown its ability to accumulate hydrogen at a level of 1 wt%. The obtained results were compared with the best result was obtained for the ZK60 alloy after equal channel angular pressing (ECAP) and crushed to a powder form. The result obtained exceeded 4 wt% of hydrogen accumulated in the metal structure, at theoretical 6.9 wt% maximum capacity. A model analysis of the theoretic absorption capacity of pure magnesium was also carried out based on the concentration of vacancies in the metal structure. The theoretical results obtained correlate well with experimental data.

Organisation(s)
Physics of Nanostructured Materials, Dynamics of Condensed Systems
External organisation(s)
AGH University of Science and Technology, Krakow Institute of Technology
Journal
International Journal of Hydrogen Energy
Volume
46
Pages
13106-13115
No. of pages
10
ISSN
0360-3199
DOI
https://doi.org/10.1016/j.ijhydene.2021.01.166
Publication date
04-2021
Peer reviewed
Yes
Austrian Fields of Science 2012
103018 Materials physics
Keywords
ASJC Scopus subject areas
Renewable Energy, Sustainability and the Environment, Fuel Technology, Condensed Matter Physics, Energy Engineering and Power Technology
Portal url
https://ucris.univie.ac.at/portal/en/publications/magnesium-gasar-as-a-potential-monolithic-hydrogen-absorbent(642b0f95-07c9-4bbb-928c-3c2a43d1588e).html