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HydrogenHydrogen, an abundant resource, is being affirmed to be a perfect replacement for fossil fuelsFossil fuel in the field of energy as its applications are devoid of greenhouse gas emissions. Magnesium hydride (MgH2MgH2) is a good storage material for hydrogenHydrogen 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 MgH2MgH2 as additivesAdditives 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 MgH2MgH2/Fe/Fe2O3/Fe3O4. The apparent activation energyActivation energy (Ea) for dehydrogenationDehydrogenation as obtained from differential calorimetry (DSC) for the milled MgH2MgH2/Fe/Fe2O3/Fe3O4 composite is 87.3 kJ/mol lower than that of as-received MgH2MgH2. Results from thermogravimetric analysis (TGATGA) show that the released hydrogenHydrogen content increases from 0.6 wt.% in as-received MgH2MgH2 to 1.8 wt.% in MgH2MgH2/Fe/Fe2O3/Fe3O4 composite. It is affirmed from temperatureTemperature programmed desorption (TPD) analysis that dehydrogenationDehydrogenation of as-received MgH2MgH2 commences from 252 °C after 19 min, while MgH2MgH2/Fe/Fe2O3/Fe3O4 composite begins to release hydrogenHydrogen from 155 °C after 7 min. In situIn situ formed Fe2O3, Fe3O4, and Fe2O3/Fe3O4 after 5 h ball milling are responsible for the hydrogenHydrogen release performances of MgH2MgH2/Fe2O3, MgH2MgH2/Fe3O4, and MgH2MgH2/Fe2O3/Fe3O4 composites. The formation of MgFe2O4 after milling Fe/Fe2O3/Fe3O4 additiveAdditives with MgH2MgH2 is responsible for its best hydrogenHydrogen release performance.

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Hydrogen Release Mechanism of MgH2 Doped with Fe-Rich Additives

  • 会议论文

  • 发表日期：

    2025年

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  • Oluwashina Philips Gbenebor,
  • Abimbola Patricia Idowu Popoola

摘要

HydrogenHydrogen, an abundant resource, is being affirmed to be a perfect replacement for fossil fuelsFossil fuel in the field of energy as its applications are devoid of greenhouse gas emissions. Magnesium hydride (MgH2MgH2) is a good storage material for hydrogenHydrogen 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 MgH2MgH2 as additivesAdditives 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 MgH2MgH2/Fe/Fe2O3/Fe3O4. The apparent activation energyActivation energy (Ea) for dehydrogenationDehydrogenation as obtained from differential calorimetry (DSC) for the milled MgH2MgH2/Fe/Fe2O3/Fe3O4 composite is 87.3 kJ/mol lower than that of as-received MgH2MgH2. Results from thermogravimetric analysis (TGATGA) show that the released hydrogenHydrogen content increases from 0.6 wt.% in as-received MgH2MgH2 to 1.8 wt.% in MgH2MgH2/Fe/Fe2O3/Fe3O4 composite. It is affirmed from temperatureTemperature programmed desorption (TPD) analysis that dehydrogenationDehydrogenation of as-received MgH2MgH2 commences from 252 °C after 19 min, while MgH2MgH2/Fe/Fe2O3/Fe3O4 composite begins to release hydrogenHydrogen from 155 °C after 7 min. In situIn situ formed Fe2O3, Fe3O4, and Fe2O3/Fe3O4 after 5 h ball milling are responsible for the hydrogenHydrogen release performances of MgH2MgH2/Fe2O3, MgH2MgH2/Fe3O4, and MgH2MgH2/Fe2O3/Fe3O4 composites. The formation of MgFe2O4 after milling Fe/Fe2O3/Fe3O4 additiveAdditives with MgH2MgH2 is responsible for its best hydrogenHydrogen release performance.