Magnesium gasar as a potential monolithic hydrogen absorbent

Autor(en)

Grzegorz Boczkal, Malwina Janoska, Daria Setman, Erhard Schafler, Piotr Dlugosz, Pawel Darlak

Abstrakt

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(en)

Physik Nanostrukturierter Materialien, Dynamik Kondensierter Systeme

Externe Organisation(en)

AGH University of Science and Technology, Lukasiewicz Research Network

Journal

International Journal of Hydrogen Energy

Band

46

Seiten

13106-13115

Anzahl der Seiten

10

ISSN

0360-3199

DOI

https://doi.org/10.1016/j.ijhydene.2021.01.166

Publikationsdatum

04-2021

Peer-reviewed

Ja

ÖFOS 2012

103018 Materialphysik

Schlagwörter

ASJC Scopus Sachgebiete

Renewable Energy, Sustainability and the Environment, Fuel Technology, Condensed Matter Physics, Energy Engineering and Power Technology

Link zum Portal

https://ucris.univie.ac.at/portal/de/publications/magnesium-gasar-as-a-potential-monolithic-hydrogen-absorbent(642b0f95-07c9-4bbb-928c-3c2a43d1588e).html