Improved hydrogen storage properties of MgH2 using transition metal sulfides as catalyst

Wang, Peng; Tian, Zhihui; Wang, Zexuan; Xia, Chaoqun; Yang, Tai; Ou, Xiaoxia

doi:10.1016/j.ijhydene.2021.05.172

Cited by 64 publications

(14 citation statements)

References 65 publications

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“…On the basis of the above result, we postulate that the MgH 2 –CoTiO 3 system presents a superior hydrogen storage performance of MgH 2 due to the synergetic effect of the in situ formation of MgTiO 3 , CoMg 2 , CoTi 2 , and MgO. These active species act like active sites at the surface of the MgH 2 matrix and provide a fast channel for the diffusion of H atoms in the absorption and desorption process [ 73 , 74 ]. For instance, a previous study stated that adding MgTiO 3 ameliorates the sorption kinetics performance of MgH 2 [ 75 ].…”

Section: Resultsmentioning

confidence: 99%

Influence of Nanosized CoTiO3 Synthesized via a Solid-State Method on the Hydrogen Storage Behavior of MgH2

et al. 2022

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Magnesium hydride (MgH2) has received outstanding attention as a safe and efficient material to store hydrogen because of its 7.6 wt.% hydrogen content and excellent reversibility. Nevertheless, the application of MgH2 is obstructed by its unfavorable thermodynamic stability and sluggish sorption kinetic. To overcome these drawbacks, ball milling MgH2 is vital in reducing the particle size that contribute to the reduction of the decomposition temperature. However, the milling process would become inefficient in reducing particle sizes when equilibrium between cold-welding and fracturing is achieved. Therefore, to further ameliorate the performance of MgH2, nanosized cobalt titanate (CoTiO3) has been synthesized using a solid-state method and was introduced to the MgH2 system. The different weight percentages of CoTiO3 were doped to the MgH2 system, and their catalytic function on the performance of MgH2 was scrutinized in this study. The MgH2 + 10 wt.% CoTiO3 composite presents the most outstanding performance, where the initial decomposition temperature of MgH2 can be downshifted to 275 °C. Moreover, the MgH2 + 10 wt.% CoTiO3 absorbed 6.4 wt.% H2 at low temperature (200 °C) in only 10 min and rapidly releases 2.3 wt.% H2 in the first 10 min, demonstrating a 23-times-faster desorption rate than as-milled MgH2 at 300 °C. The desorption activation energy of the 10 wt.% CoTiO3-doped MgH2 sample was dramatically lowered by 30.4 kJ/mol compared to undoped MgH2. The enhanced performance of the MgH2–CoTiO3 system is believed to be due to the in situ formation of MgTiO3, CoMg2, CoTi2, and MgO during the heating process, which offer a notable impact on the behavior of MgH2.

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Section: Resultsmentioning

confidence: 99%

Influence of Nanosized CoTiO3 Synthesized via a Solid-State Method on the Hydrogen Storage Behavior of MgH2

et al. 2022

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“…The gravimetric and volumetric hydrogen capacity of Mg/MgH 2 meets the US-DOE technical targets as represented in Table 1 [5] (DOE Technical Targets for Onboard Hydrogen Storage for Light-Duty Vehicles-https://www.energy.gov/eere/ fuelcells/doe-technical-targets-onboard-hydrogen-storage-light-duty-vehicles, accessed on 28 April 2022). Apart from the numerous advantages, it possesses certain demerits such as high desorption temperature, slower sorption kinetics, limiting the reversibility in bulk state, and oxidization in ambient conditions [98][99][100]. Numerous kinds of efforts have been made to improve the sorption kinetics and alter the thermodynamic-related issues by including catalyst materials [101][102][103][104], changing the dimensional [91,[105][106][107] and confining in porous structures [108][109][110].…”

Section: Significance Of Magnesium Hydride and Benefits Of Polymeric ...mentioning

confidence: 99%

Impact of Polymers on Magnesium-Based Hydrogen Storage Systems

Thangarasu

2022

Polymers

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In the present scenario, much importance has been provided to hydrogen energy systems (HES) in the energy sector because of their clean and green behavior during utilization. The developments of novel techniques and materials have focused on overcoming the practical difficulties in the HES (production, storage and utilization). Comparatively, considerable attention needs to be provided in the hydrogen storage systems (HSS) because of physical-based storage (compressed gas, cold/cryo compressed and liquid) issues such as low gravimetric/volumetric density, storage conditions/parameters and safety. In material-based HSS, a high amount of hydrogen can be effectively stored in materials via physical or chemical bonds. In different hydride materials, Mg-based hydrides (Mg–H) showed considerable benefits such as low density, hydrogen uptake and reversibility. However, the inferior sorption kinetics and severe oxidation/contamination at exposure to air limit its benefits. There are numerous kinds of efforts, like the inclusion of catalysts that have been made for Mg–H to alter the thermodynamic-related issues. Still, those efforts do not overcome the oxidation/contamination-related issues. The developments of Mg–H encapsulated by gas-selective polymers can effectively and positively influence hydrogen sorption kinetics and prevent the Mg–H from contaminating (air and moisture). In this review, the impact of different polymers (carboxymethyl cellulose, polystyrene, polyimide, polypyrrole, polyvinylpyrrolidone, polyvinylidene fluoride, polymethylpentene, and poly(methyl methacrylate)) with Mg–H systems has been systematically reviewed. In polymer-encapsulated Mg–H, the polymers act as a barrier for the reaction between Mg–H and O2/H2O, selectively allowing the H2 gas and preventing the aggregation of hydride nanoparticles. Thus, the H2 uptake amount and sorption kinetics improved considerably in Mg–H.

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“…Other material classes have also shown the ability to form in situ phases in combination with MgH 2 ; for example, a recent paper studied different transition metal sulfides (such as TiS 2 , NbS 2 , MoS 2 , MnS, CoS 2 and CuS) as additives [123]. In situ formed phases such as MgS, TiH 2 , NbH, Mo, Mn, Mg 2 CoH 5 and MgCu 2 can be viewed as an effective catalyst of the (de)hydrogenation reaction, as the sorption kinetics significantly improved, mainly at lower temperatures.…”

Section: Formation Of Catalysts During In Situ Reactionsmentioning

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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Improved hydrogen storage properties of MgH2 using transition metal sulfides as catalyst

Cited by 64 publications

References 65 publications

Influence of Nanosized CoTiO3 Synthesized via a Solid-State Method on the Hydrogen Storage Behavior of MgH2

Influence of Nanosized CoTiO3 Synthesized via a Solid-State Method on the Hydrogen Storage Behavior of MgH2

Impact of Polymers on Magnesium-Based Hydrogen Storage Systems

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

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