Synthesis of BaFe12O19 by solid state method and its effect on hydrogen storage properties of MgH2

Sazelee, N.A.; Idris, Nurul Hayati; Din, Muhamad Faiz Md; Mustafa, N.S.; Ali, N.A.; Yahya, Mohd Yazid; Yap, F.A. Halim; Sulaiman, N.N.; Ismail, Mohammad

doi:10.1016/j.ijhydene.2018.09.125

Cited by 83 publications

(23 citation statements)

References 62 publications

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“…addressing the issues mentioned above. The dehydriding/ hydriding kinetics of MgH 2 have been significantly improved by incorporating different transition metal oxide catalysts, [29][30][31][32][33][34][35][36][37][38][39][40] including TiO 2 , Nb 2 O 5 , NiTiO 3 , TiVO 3.5 , VNbO 5 , BiVO 4 , BaFe 12 O 19 , and MnFe 2 O 4 . In particular, Nb 2 O 5 has exhibited highly catalytic activity in terms of enhancing the kinetics of dehydriding/ hydriding MgH 2 at relatively low temperatures.…”

Section: Introductionmentioning

confidence: 99%

Synthesis process and catalytic activity of Nb ₂ O ₅ hollow spheres for reversible hydrogen storage of MgH ₂

et al. 2020

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Summary High operation temperatures and slow reaction kinetics are major obstacles to use MgH2 as a solid hydrogen store. We report here the synthesis of Nb2O5 hollow spheres (o‐Nb2O5) with wall thickness of approximately 50 nm and mossy surfaces using a facile hydrothermal and calcination process, which showed high activity in catalysis of MgH2 for hydrogen storage. The dehydrogenation onset temperature of MgH2 was decreased to 195°C with 7 wt% of o‐Nb2O5. More than 5.5 wt% H2 can be desorbed at 300°C within 5 minutes. Hydrogen re‐absorption starts even at 25°C and reaches 5.6 wt% within 5 minutes at 200°C. Practical hydrogen capacity stabilizes at 5.8 wt% after 10 cycles of hydrogen uptake/release. The o‐Nb2O5 was found to be reduced in situ by MgH2 to low‐valence Nb species during the initial dehydrogenation process, which functions as an active catalyst and leads to the enhanced dehydrogenation kinetics.

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Section: Introductionmentioning

confidence: 99%

Synthesis process and catalytic activity of Nb ₂ O ₅ hollow spheres for reversible hydrogen storage of MgH ₂

et al. 2020

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“…Magnesium reacts with hydrogen at high temperature (> 350 • C) and high-pressure conditions to form a thermodynamically stable hydride (high enthalpy change of hydrogen desorption of 74.6 kJ/mol [2]) which possesses a low hydrogen sorption rate [3,4]. In the quest to improve upon the sorption kinetics of magnesium-based hydrogen materials, various property-enhancing techniques such as nanoconfinement [5], catalytic metals [6][7][8][9], and catalytic metal oxide [10][11][12][13][14] addition, carbon incorporation [15], and synergistic catalysis [16] have been employed. Carbonaceous materials such as carbon black [17], graphite [18,19], carbon nanotubes [20], and crystallitic carbon from coal [21,22] have shown tremendous usefulness in improving the sorption properties of magnesium through ball milling.…”

Section: Introductionmentioning

confidence: 99%

Facile Fabrication of Biochar from Palm Kernel Shell Waste and Its Novel Application to Magnesium-Based Materials for Hydrogen Storage

Yeboah

Zhou

2020

Materials

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In this investigation, an easily-operated and cost-effective method is utilized to synthesize biochar in ambient air, and the prepared biochar is used in a novel manner as a milling aid for fabricating Mg-biochar composites for hydrogen storage. X-ray diffractometry reveals that increasing the content of palm kernel shell biochar (PKSBC) from 5 wt.% to 20 wt.% enhances the hydrogen absorption performance by increasing the conversion of Mg into MgH2 from 83% to 93%. A 40 °C reduction in decomposition temperature of MgH2 is recorded from differential scanning calorimetry curves when the content of PKSBC is increased to 20 wt.%. Magnesium is milled and hydrided under the same experimental conditions and used as a reference material. It is proposed that these property enhancements can be attributed to the fact that PKSBC acts as an anti-sticking agent for elemental Mg powders, helping in the achievement of a more dispersed composite with reduced Mg particle size due to its layered-like carbon structure.

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“…The difference between the PBE-XDM and vdW-DF2 capacities have been calculated using Eqs. (6) and (7). The M and Reference methods were, in this case, the PBE-XDM and vdW-DF2 methods, respectively.…”

Section: Reference Volumetric Capacities For Benzene and Graphene Slimentioning

confidence: 99%

Simulations of volumetric hydrogen storage capacities of nanoporous carbons: Effect of dispersion interactions as a function of pressure, temperature and pore width

Cabria

2020

International Journal of Hydrogen Energy

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Simulations of the hydrogen storage capacities of activated carbons require an accurate treatment of the interaction of a hydrogen molecule physisorbed on the graphitic-like surfaces of nanoporous carbons, which is dominated by the dispersion interactions. These interactions are described accurately by high level quantum chemistry methods such as the Coupled cluster method with single and double excitations and a non-iterative correction for triple excitations (CCSD(T)), but those methods are computationally very expensive for large systems and massive simulations. Density functional theory (DFT) based methods that include dispersion interactions are less accurate, but computationally less expensive. Calculations of the volumetric hydrogen storage capacities of nanoporous carbons, simulated as benzene and graphene slit-shaped pores, have been carried out, using a quantum-thermodynamic model of the physisorption of H 2 on surfaces and the interaction potential energy curves of H 2 physisorbed on benzene and graphene obtained using the CCSD(T) and second order Møller-Plesset (MP2) methods and the 14 most popular DFT-based methods that include the dispersion interactions at different levels of complexity. The effect of the dispersion interactions on the DFT-based volumetric capacities as a function of the pressure, temperature and pore width is evaluated. The error of the volumetric capacities obtained with the quantum-thermodynamic model and each method is also calculated and analyzed.

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Synthesis of BaFe12O19 by solid state method and its effect on hydrogen storage properties of MgH2

Cited by 83 publications

References 62 publications

Synthesis process and catalytic activity of Nb ₂ O ₅ hollow spheres for reversible hydrogen storage of MgH ₂

Synthesis process and catalytic activity of Nb ₂ O ₅ hollow spheres for reversible hydrogen storage of MgH ₂

Facile Fabrication of Biochar from Palm Kernel Shell Waste and Its Novel Application to Magnesium-Based Materials for Hydrogen Storage

Simulations of volumetric hydrogen storage capacities of nanoporous carbons: Effect of dispersion interactions as a function of pressure, temperature and pore width

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Synthesis of BaFe12O19 by solid state method and its effect on hydrogen storage properties of MgH2

Cited by 83 publications

References 62 publications

Synthesis process and catalytic activity of Nb 2 O 5 hollow spheres for reversible hydrogen storage of MgH 2

Synthesis process and catalytic activity of Nb 2 O 5 hollow spheres for reversible hydrogen storage of MgH 2

Facile Fabrication of Biochar from Palm Kernel Shell Waste and Its Novel Application to Magnesium-Based Materials for Hydrogen Storage

Simulations of volumetric hydrogen storage capacities of nanoporous carbons: Effect of dispersion interactions as a function of pressure, temperature and pore width

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Synthesis process and catalytic activity of Nb ₂ O ₅ hollow spheres for reversible hydrogen storage of MgH ₂

Synthesis process and catalytic activity of Nb ₂ O ₅ hollow spheres for reversible hydrogen storage of MgH ₂