The hydrogen storage properties of MgH2–Fe7S8 composites

Cheng, Ying; Jia, Bin; Zhang, Wei

doi:10.1039/d0ma00818d

Cited by 6 publications

(2 citation statements)

References 38 publications

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“…Zhang and co-workers discovered that MgS and Fe phases appeared in the MgH 2 –Fe 3 S 4 system. Cheng and co-workers also confirmed that MgS and Fe phases were newly formed in the ball-milling process. The two in situ formed phases had a significant influence on the dehydrogenation kinetics.…”

Section: Introductionmentioning

confidence: 79%

Fabrication of Multiple-Phase Magnesium-Based Hydrides with Enhanced Hydrogen Storage Properties by Activating NiS@C and Mg Powder

Peng

Zhang

Han

2021

ACS Sustainable Chem. Eng.

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Magnesium hydride is considered as a promising candidate for hydrogen storage; however, the sluggish kinetics and thermodynamic stability seriously obstruct its industrial applications. Hence, in order to improve the hydrogen storage performances of magnesium hydride, NiS@C additive was ball-milled with Mg powder to build NiS@C/Mg. The MgH2/Mg2NiH4 polyphase hydrides were in situ formed after hydrogenated activation and turned into Mg/Mg2Ni phases during the dehydrogenation process, establishing a cycle of hydrogen absorption and desorption. The NiS@C/Mg composite showed enhanced de/hydrogenation rates: it could quickly absorb 6.02 wt % H2 within 5 min at 250 °C and desorb 5.34 wt % H2 at 300 °C. Moreover, even at the temperature of 50 °C, it could reach 3.23 wt % hydrogen absorption capacity, and the apparent hydrogen desorption activation energy for MgH2 decreased to 60.45 kJ mol–1. It also delivered a high cyclic stability performance of 98.9% for hydrogen absorption and 98.5% for hydrogen desorption after 50 cycles. The enhanced de/absorption kinetics of NiS@C/Mg were ascribed to the synergistic effects of multiple-phase MgH2/Mg2NiH4 hydrides and the in situ formed MgS catalyst, and the existence of C also effectively prevented the passivation and agglomeration of multiple-phase particles. The method of in situ generating of multiple-phase hydrides and catalysts provides a new view for the preparation of high-performance hydrogen storage materials.

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Section: Introductionmentioning

confidence: 79%

Fabrication of Multiple-Phase Magnesium-Based Hydrides with Enhanced Hydrogen Storage Properties by Activating NiS@C and Mg Powder

Peng

Zhang

Han

2021

ACS Sustainable Chem. Eng.

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“…At the onset of adding Fe nanosheets, Mg-H bond was broken. Catalytic influence of nanostructured Fe7S8 (pyrhotite) on hydrogen sorption properties of MgH2 was studies by Cheng et al (2021). Doping the parent hydride with 16.7 wt.% Fe7S8 and ball milling, 4 wt.% H2 was absorbed at 200 o C within 1800 s; undoped MgH2 had the capacity to absorb 1.847 wt.% H2 at the same temperature and time.…”

Section: Iron (Fe)mentioning

confidence: 99%

Transition metal-based materials and their catalytic influence on MgH2 hydrogen storage: A review

Gbenebor,

Popoola

2023

Int. J. Renew. Energy Dev.

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The dependence on fossil fuels for energy has culminated in its gradual depletion and this has generated the need to seek alternative source that will be environmentally friendly and sustainable. Hydrogen stands to be promising in this regard as energy carrier which has been proven to be efficient. Magnesium hydride (MgH2) can be used in storing hydrogen because of its availability, light weight and low cost. In this review, monoatomic, alloy, intermetallic and composite forms of Ti, Ni, V, Mo, Fe, Cr, Co, Zr and Nb as additives on MgH2 are discussed. Through ball milling, additive reacts with MgH2 to form compounds including TiH2, Mg2Ni, Mg2NiH4, V2O, VH2, MoSe, Mg2FeH6, NbH and Nb2O5which remain stable after certain de/hydrogenation cycles. Some monoatomic transition metals remain unreacted even after de/hydrogenation cycles. These formed compounds, including stable monoatomic transition metals, impart their catalytic effects by creating diffusion channels for hydrogen via weakening Mg - H bond strength. This reduces hydrogen de/sorption temperatures, activation energies and in turn, hastens hydrogen desorption kinetics of MgH2. Hydrogen storage output of MgH2/transition metal-based materials depend on additive type, ratio of MgH2/additive, ball milling time, ball –to combining materials ratio and de/hydrogenation cycle. There is a need for more investigations to be carried out on nanostructured binary and ternary transition metal-based materials as additives to enhance the hydrogen storage performance of MgH2. In addition, the already established compounds (listed above) formed after ball milling or dehydrogenation can be processed and directly doped into MgH2.

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The effect of different Co phase structure (FCC/HCP) on the catalytic action towards the hydrogen storage performance of MgH2

Zhang

et al. 2022

Chinese Journal of Chemical Engineering

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The hydrogen storage properties of MgH₂–Fe₇S₈ composites

Abstract: A nanostructure Fe7S8 was successfully synthesized and their catalytic effect on hydrogen absorption/desorption performance of MgH2 was systemically discussed. MgH2+16.7 wt.% Fe7S8 composite prepared by ball-milling method offers striking catalytic...

Cited by 6 publications

References 38 publications

Fabrication of Multiple-Phase Magnesium-Based Hydrides with Enhanced Hydrogen Storage Properties by Activating NiS@C and Mg Powder

Fabrication of Multiple-Phase Magnesium-Based Hydrides with Enhanced Hydrogen Storage Properties by Activating NiS@C and Mg Powder

Transition metal-based materials and their catalytic influence on MgH2 hydrogen storage: A review

The effect of different Co phase structure (FCC/HCP) on the catalytic action towards the hydrogen storage performance of MgH2

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