Authors: Čermák, Jiří ; Král, Lubomír ; Roupcová, Pavla
Document type: Papers
Conference/Event: METAL 2019. International conference on metallurgy and materials /28./, Brno (CZ), 20190522
Year: 2019
Language: eng
Abstract: Hydrogen storage (HS) performance of three Mg- x In- y CB alloys (CB - amorphous carbon, x = 55, 64, 73 y =\n10 wt%) was studied. Indium concentration covered an area of ordered β structures. Alloys were prepared by\nball-milling in hydrogen atmosphere. Kinetic curves and PCT isotherms were measured in the temperature\ninterval from 200 °C to 325 °C. X-ray diffraction spectroscopy (XRD) was used for structure investigation. Alloy\nwith x = 73 wt% In ( β ’’ structure) showed reversible amorphization during temperature cycling between about\n100 °C and 350 °C. Hydrogen sorption experiments were done by the Sieverts method under the hydrogen\ngas pressure ranging from 0.1 MPa to 2.5 MPa. It was found that hydrogen sorption capacity varied between\n0.47 and 1.1 wt% H 2 . Hydride formation enthalpy ∆H calculated from desorption PCT experiments was\nsignificantly lower than ∆H , known for pure Mg. This invoked an idea that atomic order of Mg-based HS\nmaterials might decrease the high thermodynamic stability of hydride phase.
Keywords: hydride stability; Hydrogen storage; Mg alloys; ordering
Project no.: LQ1601 (CEP), GA17-21683S (CEP)
Funding provider: GA MŠk, GA ČR
Host item entry: Metal 2019 - 28th International Conference on Metallurgy and Materials, ISBN 978-80-87294-92-5

Institution: Institute of Physics of Materials AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0302518

Permalink: http://www.nusl.cz/ntk/nusl-407984

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 Record created 2019-12-09, last modified 2021-11-24

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