Thermodynamics and kinetics of nano-engineered Mg-MgH 2 system for reversible hydrogen storage application

Kumar, Sanjay; Singh, Anamika; Tiwari, G.P.; Kojima, Yoshitsugu; Kain, Vivekanand

doi:10.1016/j.tca.2017.03.021

Cited by 38 publications

(6 citation statements)

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“…Besides nanocrystallization by the top-down approach, the hydrogen storage properties of Mg-based materials can be further enhanced by the addition of catalysts such as different transition metals [30][31][32][33][34], transition metal oxides [17,20,[34][35][36] and carbon-based materials, such as carbon nanotubes [37][38][39][40][41]. Among various transition metal oxide additives, TiO 2 has proved to be one of the most effective in improving the hydrogen sorption kinetics of MgH 2 [38,[42][43][44].…”

Section: Introductionmentioning

confidence: 99%

Microstructural Investigation of Nanocrystalline Hydrogen-Storing Mg-Titanate Nanotube Composites Processed by High-Pressure Torsion

et al. 2020

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A high-energy ball milling and subsequent high-pressure torsion method was applied to synthesize nanocrystalline magnesium samples catalyzed by TiO2 or titanate nanotubes. The microstructure of the as-milled powders and the torqued bulk disks was characterized by X-ray diffraction. The recorded diffractograms have been evaluated by the convolutional multiple whole profile fitting algorithm, which provided microstructural parameters (average crystal size, crystallite size distribution, average dislocation density). The morphology of the nanotube-containing disks has been examined by high-resolution transmission electron microscopy. The effect of the different additives and preparation conditions on the hydrogen absorption behavior was investigated in a Sieverts’-type apparatus. It was found that the ball-milling route has a prominent effect on the dispersion and morphology of the titanate nanotubes, and the absorption capability of the Mg-based composite is highly dependent on these features.

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Section: Introductionmentioning

confidence: 99%

Microstructural Investigation of Nanocrystalline Hydrogen-Storing Mg-Titanate Nanotube Composites Processed by High-Pressure Torsion

et al. 2020

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“…The appearance of a doublet peak is due to spin–orbit coupling, and as a result, the peak for Zr 3d is split into high‐spin 3d 5/2 and low‐spin 3d 3/2 energy levels. The peak shifts can be due to either chemical shift or a residual charge effect . In the case of Li 3 Mg 7 , peaks for the Zr 3d electrons are found at binding energies of 174.3 and 183.3 eV, as illustrated in Figure d. The broader peak at a binding energy of 183.3 eV seems to be the result of the overlap of two peaks.…”

Section: Resultsmentioning

confidence: 99%

“…Thea ppearance of ad oublet peak is due to spin-orbit coupling, and as aresult, the peak for Zr 3d is split into high-spin 3d 5/2 and low-spin 3d 3/2 energyl evels.T he peak shifts can be due to either chemical shift or ar esidualc harge effect. [21,22] In the case of Li 3 Mg 7 ,p eaks for the Zr 3d electrons are found at binding energies of 174.3 and 183.3 eV,a s illustrated in Figure 9d.T he broader peak at ab inding energy of 183.3 eV seems to be the result of the overlap of two peaks.T hese peaks indicate that ZrCl 4 is reduced to al ower oxidation state or even metallic zirconium. Thes hift in the peak for ZrCl 4 clearlyi ndicates ac hemical interaction and doping of the in situ formed catalyst over the Li 3 Mg 7 surface.D opingl eads to diffusiono ft he Zr 3d electrons,w hich eventually lowers the binding energy (BE) of the Zr 3d electrons.D ensity functional theory (DFT) shows that the Zrdoped surface favors hydrogen dissociation [23][24][25][26][27][28] az ero hydrogen backpressure.P hase analysis was done by powder X-ray diffraction (RINT-2100, Rigaku, CuK a radiation).…”

Section: Mechanism and Role Of Catalystmentioning

confidence: 99%

Tailoring the Thermodynamics and Kinetics of Mg–Li Alloy for a MgH₂‐Based Anode for Lithium‐Ion Batteries

et al. 2017

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Understanding the lithiation–delithiation of the Mg–Li alloy during the absorption–desorption of hydrogen is essential for the development of Li‐ion batteries with MgH2 as a negative electrode. Tuning the hydrogenation–dehydrogenation kinetics and thermodynamics of the Mg–Li alloy could also be helpful to develop a lightweight material for on‐board hydrogen‐storage applications. Single‐phase Li3Mg7 (the highest % of lithium compound) was prepared by ball milling of LiH and MgH2 as precursors of Li and Mg followed by dehydrogenation at 400 °C under dynamic vacuum conditions. The cyclic hydrogenation–dehydrogenation behavior of the intermetallic was studied in detail. During hydrogenation, Li3Mg7 was delithiated to LiH and MgH2, whereas during dehydrogenation, LiH and MgH2 were lithiated to form the Li3Mg7 phase along with a Mg–Li solid solution. The hydrogenation–dehydrogenation kinetics of pristine Li3Mg7 were found to be slow. The hydrogenation–dehydrogenation kinetics were remarkably improved by doping with ZrCl4 as a catalyst. The activation energy and the thermodynamic parameters of the uncatalyzed and catalyzed alloy were evaluated, and the results were compared.

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“…The catalytic effect of nanocrystalline Fe on ball-milled Mg is outstanding, i.e., this composite could be hydrogenated even at 0 • C up to 45% of the theoretical capacity [75]. The significantly improved absorption-desorption behavior with respect to pristine Mg is attributed to the nano-engineered surface of the magnesium particles.…”

Section: Recent Research Trends In the Catalysis Of Mg-based Hydrogen Storage Materials 41 Transition Metal-based Additives For Catalyzinmentioning

confidence: 97%

Improved H-Storage Performance of Novel Mg-Based Nanocomposites Prepared by High-Energy Ball Milling: A Review

Révész

Gajdics

2021

Energies

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Hydrogen storage in magnesium-based composites has been an outstanding research area including a remarkable improvement of the H-sorption properties of this system in the last 5 years. Numerous additives of various morphologies have been applied with great success to accelerate the absorption/desorption reactions. Different combinations of catalysts and preparation conditions have also been explored to synthesize better hydrogen storing materials. At the same time, ball milling is still commonly and effectively applied for the fabrication of Mg-based alloys and composites in order to reduce the grain size to nanometric dimensions and to disperse the catalyst particles over the surface of the host material. In this review, we present the very recent progress, from 2016 to 2021, on catalyzing the hydrogen sorption of Mg-based materials by ball milling. The various catalyzing routes enhancing the hydrogenation performance, including in situ formation of catalysts and synergistic improvement achieved by using multiple additives, will also be summarized. At the end of this work, some thoughts on the prospects for future research will be highlighted.

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Thermodynamics and kinetics of nano-engineered Mg-MgH 2 system for reversible hydrogen storage application

Cited by 38 publications

References 39 publications

Microstructural Investigation of Nanocrystalline Hydrogen-Storing Mg-Titanate Nanotube Composites Processed by High-Pressure Torsion

Microstructural Investigation of Nanocrystalline Hydrogen-Storing Mg-Titanate Nanotube Composites Processed by High-Pressure Torsion

Tailoring the Thermodynamics and Kinetics of Mg–Li Alloy for a MgH₂‐Based Anode for Lithium‐Ion Batteries

Improved H-Storage Performance of Novel Mg-Based Nanocomposites Prepared by High-Energy Ball Milling: A Review

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Thermodynamics and kinetics of nano-engineered Mg-MgH 2 system for reversible hydrogen storage application

Cited by 38 publications

References 39 publications

Microstructural Investigation of Nanocrystalline Hydrogen-Storing Mg-Titanate Nanotube Composites Processed by High-Pressure Torsion

Microstructural Investigation of Nanocrystalline Hydrogen-Storing Mg-Titanate Nanotube Composites Processed by High-Pressure Torsion

Tailoring the Thermodynamics and Kinetics of Mg–Li Alloy for a MgH2‐Based Anode for Lithium‐Ion Batteries

Improved H-Storage Performance of Novel Mg-Based Nanocomposites Prepared by High-Energy Ball Milling: A Review

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Tailoring the Thermodynamics and Kinetics of Mg–Li Alloy for a MgH₂‐Based Anode for Lithium‐Ion Batteries