Na-modified cast hypo-eutectic Mg–Mg2Si alloys for solid-state hydrogen storage

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dc.contributor.authorTan, XFen_AU
dc.contributor.authorKim, MJen_AU
dc.contributor.authorGu, QFen_AU
dc.contributor.authorPinzon Piraquive, Jen_AU
dc.contributor.authorZeng, Gen_AU
dc.contributor.authorMcDonald, SDen_AU
dc.contributor.authorNogita, Ken_AU
dc.date.accessioned2023-02-20T01:31:20Zen_AU
dc.date.available2023-02-20T01:31:20Zen_AU
dc.date.issued2022-08-01en_AU
dc.date.statistics2022-05-26en_AU
dc.description.abstractMg2Si is a promising catalyst for Mg-based H2 storage materials due to its low cost, light weight, and non-toxic properties. This study investigates the effects of Na in hypo-eutectic Mg-1wt.%Si alloys for H2 storage applications. The addition of trace amounts of Na is vital in improving the H2 sorption kinetics, achieving a H2 storage capacity of 6.72 wt.% H at 350 °C under 2 MPa H2, compared to 0.31 wt.% H in the non-Na added alloy. The hydrogen sorption mechanisms were analysed with Johnson-Mehl-Avrami-Kolmogorov models. It was identified that Na affects the surface of the Mg alloys, forming porous Na2O and NaOH in addition to MgO, facilitating the diffusion of H2. Finally, in-situ synchrotron powder X-ray diffraction showed the Mg2Si catalyst is stable during the H2 sorption reactions. This result demonstrates the potential use of Mg–Mg2Si casting alloys for large scale hydrogen storage and transportation applications. © 2022 Elsevier B.Ven_AU
dc.description.sponsorshipThis work was supported by the Australian Research Council [LP160100690]; the University of Queensland [Research Training Program (RTP) scholarship]; ANSTO, Australia [proposal AS211/PD/16842].en_AU
dc.identifier.articlenumber231538en_AU
dc.identifier.citationTan, X. F., Kim, M., Gu, Q., Pinzon Piraquive, J., Zeng, G., McDonald, S. D., & Nogita, K. (2022). Na-modified cast hypo-eutectic Mg–Mg2Si alloys for solid-state hydrogen storage. Journal of Power Sources, 538, 231538. doi:10.1016/j.jpowsour.2022.231538en_AU
dc.identifier.issn0378-7753en_AU
dc.identifier.journaltitleJournal of Power Sourcesen_AU
dc.identifier.urihttps://doi.org/10.1016/j.jpowsour.2022.231538en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/14672en_AU
dc.identifier.volume538en_AU
dc.language.isoenen_AU
dc.publisherElsevier B. V.en_AU
dc.subjectHydrogen storageen_AU
dc.subjectMetalsen_AU
dc.subjectHalidesen_AU
dc.subjectAlloysen_AU
dc.subjectSynchrotron radiationen_AU
dc.subjectX-ray diffractionen_AU
dc.subjectTransmission electron microscopyen_AU
dc.subjectX-ray photoelectron spectroscopyen_AU
dc.subjectSorptionen_AU
dc.subjectTrace amountsen_AU
dc.subjectCatalystsen_AU
dc.titleNa-modified cast hypo-eutectic Mg–Mg2Si alloys for solid-state hydrogen storageen_AU
dc.typeJournal Articleen_AU
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