Multiple improvements of hydrogen sorption and their mechanism for MgH2 catalyzed through TiH2@Gr

Verma, Satish; Bhatnagar, Ashish; Shukla, Vivek; Soni, Pawan K.; Pandey, Anant Prakash; Awasthi, Kalpana; Srivastava, O. N.

doi:10.1016/j.ijhydene.2020.05.031

Cited by 88 publications

(40 citation statements)

References 65 publications

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“…Thus, hydrogen can be produced from water and it also produces water when it is burnt with oxygen. In spite of all such merits, a perfect hydrogen fuel-based economic system for vehicular applications (hydrogen economy) has not yet been framed due to technical challenges in areas of the hydrogen production, storage, and application (Verma et al 2020 ). Among these three areas of challenges, hydrogen storage presents a key challenge due to its very low density (0.08988 g/L).…”

Section: Concept Of Multicomponent High-entropy Alloysmentioning

confidence: 99%

High-Entropy Alloys for Solid Hydrogen Storage: Potentials and Prospects

Yadav

Kumar

Verma

et al. 2022

Trans Indian Natl. Acad. Eng.

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Hydrogen storage is one of the most significant research areas for exploiting hydrogen energy economy. To store hydrogen with a high gravimetric/volumetric density, gaseous hydrogen storage systems require a very high-pressure compressed gas cylinder which is quite unsafe and the storage in the liquid form needs cryogenic containers to be maintained at roughly 20 K under ambient pressure because hydrogen has a very low critical temperature of 33 K. However, hydrogen can be stored in solid materials with higher concentration of hydrogen compared to the gaseous and liquid hydrogen storage systems. It is therefore, worthwhile to look into the experimental and theoretical research on prospective hydrogen storage materials. The hydride-forming alloys and intermetallic compounds are found to be the most important families of hydrogen storage materials. Multicomponent alloys consisting of five or more principal elements, also known as high-entropy alloys appear to have potential for the development as hydrogen storage materials. Hydride-forming elements like Ti, Zr, V, Nb, Hf, Ta, La, Ce, Ni, and others have been shown to have hydrogen storage properties and the ability to produce single-phase high-entropy intermetallics. Here, attempts will be made to present a short review on utilization of multicomponent high-entropy alloys as solid hydrogen storage materials. Furthermore, we will also present some of our work on the synthesis, structural–microstructural characterization and hydrogen storage properties of Ti–Zr–V–Cr–Ni equi-atomic hydride-forming high-entropy alloys. From the preliminary investigation, the maximum storage capacity in this system was observed to be 1.78 wt%, which is comparable to other hydrogen storage materials. The prospects of high-entropy-based alloys for hydrogen storage will be discussed.

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Section: Concept Of Multicomponent High-entropy Alloysmentioning

confidence: 99%

High-Entropy Alloys for Solid Hydrogen Storage: Potentials and Prospects

Yadav

Kumar

Verma

et al. 2022

Trans Indian Natl. Acad. Eng.

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“…Similar findings were concluded when various materials supported on graphene were added to MgH 2 or an Mg-based alloy through ball milling. In case of TiH 2 templated over graphene, the graphene support effectively inhibited the agglomeration of TiH 2 ; additionally, the milling procedure introduced defects to the graphene, which is suggested to play a co-catalytic role with the TiH 2 [135]. Another study demonstrated that an electronic interaction exists between FeCoNi nanoparticles and their graphene support, which leads to an enhanced catalytic effect [136].…”

Section: Utilization Of Synergy Between Multiple Catalystsmentioning

confidence: 99%

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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“…Carbon materials as the focus of current research, many other carbon-supported catalysts with excellent performance have emerged in recent years. For example, Ti-based catalysts such as TiH 2 @Gr, [114] TiO 2 @C, [115] GC-TiCl 3 , [116] Zr-based catalysts such as ZrO 2 /C, [117] Zr 0.4 Ti 0.6 Co/CNTs [118] and Co-based catalysts such as Co@CNTs, [119] CoFeB@C. [120] All of them have played an outstanding role in improving the kinetics of MgH 2 dehydrogenation/hydrogen absorption. TiH 2 @Gr has a significant effect on the de/hydrogenation properties of MgH 2 , 5.64 wt %H 2 can be quickly released in 1.3 min at 300°C.…”

Section: Other Carbon-supported Catalystsmentioning

confidence: 99%

“…Third, TiH 2 is anchored to the graphene, inhibiting catalyst caking. [114] Similarly, Zhang et al [115] prepared the MgH 2 -10 wt %TiO 2 @C nanocomposite system, which absorbed about 6.6 wt %H 2 in 10 min at 140°C, and rapidly released 6.5 wt %H 2 in 7 min at 300°C. It is worth mentioning that density functional theory calculation shows that when MgH 2 is adsorbed on TiO 2 cluster, the bond length of MgÀ H bond is extended and the bond strength is decreased, which is the main reason for the decrease of the dehydrogenation temperature of MgH 2 .…”

Section: Other Carbon-supported Catalystsmentioning

confidence: 99%

Improvement of Mg‐Based Hydrogen Storage Materials by Metal Catalysts: Review and Summary

et al. 2021

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Magnesium hydride (MgH 2 ) has become a very promising hydrogen storage material because of its high hydrogen storage capacity, good reversibility and low cost. However, high thermodynamic stability and slow kinetic performance of MgH 2 limit its practical application. In the past few decades, many alternative methods have been designed to solve this problem. A large number of studies have demonstrated that the use of metal catalyst doping modification, MgH 2 nanocrystallization and other methods can greatly improve the hydrogen absorption and dehydrogenation performance of MgH 2 . Therefore, this paper reviews and summarizes the modification effect of transition metal catalyst doping on the hydrogen storage performance of MgH 2 , especially the catalysis on the de/rehydrogenation performance of MgH 2 . In addition, promoting effects of carbon materials, transition metal alloys and compounds on the hydrogen storage performance of MgH 2 were also summarized. Finally, the existing problems and challenges of MgH 2 as hydrogen storage materials are discussed, and some possible strategies are proposed.

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Multiple improvements of hydrogen sorption and their mechanism for MgH2 catalyzed through TiH2@Gr

Cited by 88 publications

References 65 publications

High-Entropy Alloys for Solid Hydrogen Storage: Potentials and Prospects

High-Entropy Alloys for Solid Hydrogen Storage: Potentials and Prospects

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

Improvement of Mg‐Based Hydrogen Storage Materials by Metal Catalysts: Review and Summary

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