Hydrogen storage properties of bulk nanostructured ZK60 Mg alloy processed by Equal Channel Angular Pressing

Autor(en)

Maciej Krystian, Michael Zehetbauer, H Kropik, Bernhard Mingler, Gerhard Krexner

Abstrakt

It is shown that hydrogen storage materials nanostructured by Severe Plastic Deformation (SPD) retaining the bulk shape are capable to meet or even exceed the adsorption/desorption kinetics of their ball milled counterpart. The grain size of commercial magnesium alloy ZK60 was decreased by Equal Channel Angular Pressing (ECAP) down to 250 nm – the smallest value ever achieved by this technique. The material exhibits high gravimetric hydrogen storage capacity of 6.6 wt.% and rapid hydrogen desorption kinetics of less than 5 min at 350 °C. Furthermore, the influence of grain size, surface oxidation and of the addition of metallic chromium as catalyst on the storage capacity and kinetics was investigated. A new method for rapid activation in only one charging/discharging process was successfully tested. The long-term durability of the material was proven in a cyclic sorption/desorption test up to 1000 cycles; no deterioration in storage capacity or in kinetics was observed which is exceptional for nanomaterials for hydrogen storage. Finally, the pressure–composition isotherms of ZK60 were extended by new plateaus at low temperatures (200–260 °C).

Organisation(en)

Physik Nanostrukturierter Materialien, Physik Funktioneller Materialien

Externe Organisation(en)

Universität Wien

Journal

Journal of Alloys and Compounds

Band

509

Seiten

449-455

Anzahl der Seiten

7

ISSN

0925-8388

DOI

https://doi.org/10.1016/j.jallcom.2011.01.029

Publikationsdatum

01-2011

ÖFOS 2012

210006 Nanotechnologie, 103018 Materialphysik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/d38582e0-1154-44ef-a24e-e0792e3d39bd