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Meeting	2025 TMS Annual Meeting & Exhibition
Symposium	Materials for Sustainable Hydrogen Energy
Presentation Title	Hydrogen Release Mechanism of MgH2 Doped with Fe-Rich Additives
Author(s)	Oluwashina Philips Gbenebor, Abimbola Patricia Popoola
On-Site Speaker (Planned)	Oluwashina Philips Gbenebor
Abstract Scope	Hydrogen, an abundant resource, is being affirmed to be a perfect replacement for fossil fuels in the field of energy as its applications are devoid of greenhouse gas emissions. Magnesium hydride (MgH2) is a good storage material for hydrogen but its slow desorption kinetics has been an issue. In this study, iron (II, III) oxide (Fe3O4), iron (III) oxide (Fe2O3) and iron (Fe) particles were introduced to MgH2 as additives via high energy ball milling operated for 5 h and 300 rpm. The clustering of these fine particles into porous-like agglomerates is promoted by the milling process. In addition, X-ray diffraction analysis (XRD) informs that MgFe2O4 is formed after ball milling MgH2/Fe/Fe2O3/Fe3O4. The apparent activation energy (Ea) for dehydrogenation as obtained from differential calorimetry (DSC) for the milled MgH2/Fe/Fe2O3/Fe3O4 composite is 87.3 kJ/mol lower than that of as-received MgH2. Results from thermogravimetric analysis (TGA) show that the released hydrogen content increases from 0.6 wt. % in as-received MgH2 to 1.8 wt. % in MgH2/Fe/Fe2O3/Fe3O4 composite. It is affirmed from temperature programmed desorption (TPD) analysis that dehydrogenation of as-received MgH2 commences from 252 oC after 19 min while MgH2/Fe/Fe2O3/Fe3O4 composite begins to release hydrogen from 155 oC after 7 min. In situ formed Fe2O3, Fe3O4 and Fe2O3/Fe3O4 after 5 h ball milling are responsible for the hydrogen release performances of MgH2/Fe2O3, MgH2/Fe3O4 and MgH2/Fe2O3/Fe3O4 composites. The formation of MgFe2O4 after milling Fe/Fe2O3/Fe3O4 additive with MgH2 is responsible for its best hydrogen release performance.
Proceedings Inclusion?	Planned:
Keywords	Composites, Magnesium,

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