Název: PHASE COMPOSITION OF CHOSEN Mg-BASED MATERIALS DURING HYDROGEN SORPTION
Autoři: Čermák, Jiří ; Král, Lubomír ; Roupcová, Pavla
Typ dokumentu: Příspěvky z konference
Konference/Akce: 10th Anniversary International Conference on Nanomaterials - Research and Application (NANOCON 2018), Brno (CZ), 20181017
Rok: 2019
Jazyk: eng
Abstrakt: Phase transformation during hydrogen sorption was investigated in ten chosen magnesium-based hydrogen storage (HS) materials. Chemical composition of the materials consisted of Mg, as a principal hydrogen-binding element, additive X and amorphous carbon (CB), as an anti-sticking component. In order to assess the effect of X itself upon the structure, values of concentration of both X and CB were fixed to about 12 wt. %. The influence of X = Mg2Si, Mg2Ge, Mg17Al12, Mg5Ga2, NaCl, LiCl, NaF, LiF and two combinations Ni+Mg17Al12 and Ni+Mg2Si upon the changes in phase composition was tested. Phase content in HS materials was observed (i) after the intensive ball milling (BM), (ii) after the BM followed by hydrogen charging at 623 K and (iii) after the BM and one hydrogen charging/discharging cycle (C/D) at temperature 623 K. The study was carried out by SEM and XRD. It was found that, the C/D is approximately structurally reversible for X = Mg2Ge, Mg17Al12, NaF and LiF. However, additives X = Mg17Al12 and NaF decompose already during the BM. In alloys with combination of Ni with Mg17Al12, new phases NimAln are formed. Phase composition changed during C/D for X = Mg2Si Mg5Ga2 and Ni+Mg2Si due to equilibration of phases composition. Observed structure changes of HS materials with chloride ionic additives NaCl and LiCl are, most likely caused by the relatively strong affinity between Mg and Cl. Hydrogen storage capacity of all studied alloys was 6.0 +/- 0.3 wt. % H-2.
Klíčová slova: carbon black; Hydrogen storage; Mg alloys
Číslo projektu: GA17-21683S (CEP)
Poskytovatel projektu: GA ČR
Zdrojový dokument: 10th Anniversary International Conference on Nanomaterials - Research and Application (NANOCON 2018), ISBN 978-80-87294-89-5

Instituce: Ústav fyziky materiálů AV ČR (web)
Informace o dostupnosti dokumentu: Dokument je dostupný na externích webových stránkách.
Externí umístění souboru: https://www.confer.cz/nanocon/2018/read/226-phase-composition-of-chosen-mg-based-materials-during-hydrogen-sorption.pdf
Původní záznam: http://hdl.handle.net/11104/0312042

Trvalý odkaz NUŠL: http://www.nusl.cz/ntk/nusl-433171


Záznam je zařazen do těchto sbírek:
Věda a výzkum > AV ČR > Ústav fyziky materiálů
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