Enhanced hydrogen storage properties and mechanisms of magnesium hydride modified by transition metal dissolved magnesium oxides

Zhang, J.; Yan, Shuai; Yu, Linping; Zhou, Xiaojie; Zhou, Tao; Peng, Ping

doi:10.1016/j.ijhydene.2018.10.017

Cited by 34 publications

(6 citation statements)

References 63 publications

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“…In addition, Mg-Ti oxide at the MgH 2 /TiO 2 interfaces could also strongly anchor MgH 2 nanoparticles, which significantly inhibits the growth and agglomeration of MgH 2 particles during cycling. Moreover, the high ductility and flexibility of the Mg-Ti oxide [ 53 ] can significantly buffer the volume change of MgH 2 particles during de/re-hydrogenation cycles, preventing the detachment of MgH 2 from the TiO 2 substrate and thereby ensuring the excellent cyclic stability.…”

Section: Resultsmentioning

confidence: 99%

Oxygen Vacancy-Rich 2D TiO2 Nanosheets: A Bridge Toward High Stability and Rapid Hydrogen Storage Kinetics of Nano-Confined MgH2

Ren

Zhu

et al. 2022

Nano-Micro Lett.

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MgH2 has attracted intensive interests as one of the most promising hydrogen storage materials. Nevertheless, the high desorption temperature, sluggish kinetics, and rapid capacity decay hamper its commercial application. Herein, 2D TiO2 nanosheets with abundant oxygen vacancies are used to fabricate a flower-like MgH2/TiO2 heterostructure with enhanced hydrogen storage performances. Particularly, the onset hydrogen desorption temperature of the MgH2/TiO2 heterostructure is lowered down to 180 °C (295 °C for blank MgH2). The initial desorption rate of MgH2/TiO2 reaches 2.116 wt% min−1 at 300 °C, 35 times of the blank MgH2 under the same conditions. Moreover, the capacity retention is as high as 98.5% after 100 cycles at 300 °C, remarkably higher than those of the previously reported MgH2-TiO2 composites. Both in situ HRTEM observations and ex situ XPS analyses confirm that the synergistic effects from multi-valance of Ti species, accelerated electron transportation caused by oxygen vacancies, formation of catalytic Mg-Ti oxides, and stabilized MgH2 NPs confined by TiO2 nanosheets contribute to the high stability and kinetically accelerated hydrogen storage performances of the composite. The strategy of using 2D substrates with abundant defects to support nano-sized energy storage materials to build heterostructure is therefore promising for the design of high-performance energy materials.

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Section: Resultsmentioning

confidence: 99%

Oxygen Vacancy-Rich 2D TiO2 Nanosheets: A Bridge Toward High Stability and Rapid Hydrogen Storage Kinetics of Nano-Confined MgH2

Ren

Zhu

et al. 2022

Nano-Micro Lett.

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“…Therefore, the protection of MgH 2 by PMMA has successfully prevented the surface of MgH 2 particles from the formation of a MgO/Mg(OH) 2 layer. This is important because the formation of this passive layer can make H atoms' diffusion during the dehydrogenation process very difficult [46,47]. Thus, air stability created in the composite by PMMA reduced MgO/Mg(OH) 2 layer formation and consequently improved the dehydrogenation kinetics of M5P and M20P samples.…”

Section: Tga Analysismentioning

confidence: 99%

Investigation of dehydrogenation performance and air stability of MgH2–PMMA nanostructured composite prepared by direct high-energy ball-milling

Rafatnejad

Raygan

Azar

2020

Mater Renew Sustain Energy

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Mechanical milling and a gas-selective polymer were used to protect MgH2 from oxidation and improve its dehydrogenation properties. MgH2 and poly(methyl methacrylate) (PMMA) were simultaneously ball-milled for 5 and 20 h, respectively, to prepare an air-resistant nanostructured composite. The properties of the nanostructured composite were studied by XRD, SEM, and FTIR methods. The dehydrogenation performance of all samples was investigated by TGA analysis. The hydrogen desorption performance of ball-milled samples was also evaluated after exposure to air for 4 weeks. Results showed that MgH2 desorbed about 0.79 wt.% of hydrogen after heating up to 300 ˚C and holding for 15 min at this temperature. The ball-milling of MgH2 and PMMA for 5 and 20 h led to hydrogen desorption of 6.21 and 6.10 wt.% after heating up to 300 ˚C and holding for 15 min at this temperature, respectively, which proved the surface protection of MgH2 from oxidation by PMMA. After 4 weeks of exposing the ball-milled MgH2–PMMA samples to air, their hydrogen desorption percentage at the same condition changed to 5.80 and 5.72 wt.% for 5 and 20 h milled samples, respectively. A slight reduction in the dehydrogenation percentage of air-exposed samples proved that the air stability of MgH2 had been significantly enhanced by its confinement with PMMA.

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“…This Perspective focuses on Mg, for which many studies have been conducted because of its promise as a hydrogen storage material, and describes strategies for improving the thermodynamics of binary hydrides. Various approaches have been explored to improve the hydrogen sorption thermodynamics of Mg, including nanosizing, − ,,,,,, the use of catalysts, ,− and encapsulation in scaffolds. ,,,− ,− ,− , It is beyond the scope of this Perspective to cover all of the above, so only the effect of nanosizing is briefly described to distinguish it from the interfacial interaction in the composite structure that will be introduced later.…”

Section: Fundamentals Of Thermodynamic and Kinetic Barriers For Hydro...mentioning

confidence: 99%

Nanointerface Engineering of Metal Hydrides for Advanced Hydrogen Storage

Cho

2023

Chem. Mater.

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With global efforts to relieve the formidable impact of climate change, hydrogen is considered a viable replacement for fossil fuels without intermittency concerns of other renewable sources. Hydrogen storage plays a pivotal role in the implementation of hydrogen economy, coupling hydrogen production with fuel cell technologies. Storing hydrogen in the form of solid-state hydride materials has been studied as a future hydrogen storage technology for enabling a safe, energy-efficient, and high-energy-density system. However, hostile thermodynamic and kinetic properties of each hydride material result in insufficient hydrogen storage performance for practical applications, such as sluggish hydrogen absorption or desorption, high dehydrogenation temperatures, and sometimes limited reversibility; thus, these kinetic and thermodynamic characteristics need to be thoroughly understood depending on each hydride material. Among various strategies, nanostructuring has been regarded as a general approach to tackling such limitations regarding thermodynamic and kinetic characteristics of hydride materials. In particular, the formation of nanosized hydrides within a nanostructured scaffoldalso known as nanoconfinementis of great potential for advanced hydrogen storage because it can additionally leverage host–guest interactions at the nanointerfaces of hydride materials and scaffolds. In this context, the active tuning of such nanointerfaces brings about additional thermodynamic or kinetic changes in hydrogen sorption reactions compared to the unmodified nanoconfined hydride composites, holding great promise for tailored strategies for each metal hydride. In this Perspective, we summarize the major thermodynamic and kinetic barriers of each metal hydride and highlight the recent progress in overcoming such limits, mainly focusing on nanointerface engineering in nanoconfined metal hydrides. Further, we provide our insight and current challenges in understanding the underlying mechanisms of the interaction at the nanointerface, whereby the noticeable technological leaps can be emulated in practical systems.

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Enhanced hydrogen storage properties and mechanisms of magnesium hydride modified by transition metal dissolved magnesium oxides

Cited by 34 publications

References 63 publications

Oxygen Vacancy-Rich 2D TiO2 Nanosheets: A Bridge Toward High Stability and Rapid Hydrogen Storage Kinetics of Nano-Confined MgH2

Oxygen Vacancy-Rich 2D TiO2 Nanosheets: A Bridge Toward High Stability and Rapid Hydrogen Storage Kinetics of Nano-Confined MgH2

Investigation of dehydrogenation performance and air stability of MgH2–PMMA nanostructured composite prepared by direct high-energy ball-milling

Nanointerface Engineering of Metal Hydrides for Advanced Hydrogen Storage

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