Long-term hydrogen storage in Mg and ZK60 after Severe Plastic Deformation

Author(s)

Andreas Grill, Jelena Horky, Ajit Panigrahi, Gerhard Krexner, Michael Zehetbauer

Abstract

This paper reports long-term hydrogen storage experiments on MgH₂

and on the Mg alloy ZK60 following prior Severe Plastic Deformation

(SPD). Although SPD processing leads to significant enhancements of

hydrogen absorption and desorption rates in both materials, these are

not necessarily stable with respect to repeated loading/unloading

cycles. Cold rolled (CR) MgH₂ shows a reduction of capacity

by 30% after 100 cycles. In contrast, in ZK60 (Mg-5Zn-0.8Zr) processed

by High Pressure Torsion (HPT), both kinetics and storage capacity are

stable for at least 200 absorption/desorption cycles. Analysis by means

of Johnson-Mehl-Avrami theory clearly suggests that in the case of CR

MgH₂ nucleation is followed by growth of extended MgH₂

domains leading to a gradual deterioration of hydrogen diffusion and

storage/release characteristics. In the case of HPT ZK60, however, no

further growth occurs subsequent to nucleation thus allowing for

permanently enhanced hydrogen diffusion and stable storage/release

properties. These results can be understood in terms of the different

density and stability of SPD-induced lattice defects acting as

nucleation sites in both materials studied.

Organisation(s)

Physics of Nanostructured Materials, Physics of Functional Materials

Journal

International Journal of Hydrogen Energy

Volume

Pages

17144-17152

No. of pages

ISSN

0360-3199

DOI

https://doi.org/10.1016/j.ijhydene.2015.05.145

Publication date

12-2015

Peer reviewed

Yes

Austrian Fields of Science 2012

207106 Renewable energy

Keywords

ASJC Scopus subject areas

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

Sustainable Development Goals

SDG 7 - Affordable and Clean Energy

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