A noteworthy synergistic catalysis on hydrogen sorption kinetics of MgH2 with bimetallic oxide Sc2O3/TiO2

Huang, Haixiang; Yuan, Jianguang; Zhang, Bao; Zhang, J.G.; Zhu, Yunfeng; Li, L.Q.; Wu, Ying

doi:10.1016/j.jallcom.2020.155387

Cited by 37 publications

(5 citation statements)

References 47 publications

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“…According to a study by Zou et al [ 70 ], the polarization might weaken the Ti–O bonds and Mg-H bonds, which make MgH 2 decompose quickly after the addition of TiO. Furthermore, Huang et al [ 71 ] discovered that faster absorption/desorption kinetics of MgH 2 can be observed after the addition of Sc 2 O 3 and TiO 2 . Further findings indicate that the surface defects and grain boundaries created by the milling process after the addition of Sc 2 O 3 and TiO 2 provide a significant number of diffusion channels and active sites that greatly enhance the kinetics of MgH 2 .…”

Section: Resultsmentioning

confidence: 99%

Ni0.6Zn0.4O Synthesised via a Solid-State Method for Promoting Hydrogen Sorption from MgH2

2023

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Magnesium hydrides (MgH2) have drawn a lot of interest as a promising hydrogen storage material option due to their good reversibility and high hydrogen storage capacity (7.60 wt.%). However, the high hydrogen desorption temperature (more than 400 °C) and slow sorption kinetics of MgH2 are the main obstacles to its practical use. In this research, nickel zinc oxide (Ni0.6Zn0.4O) was synthesized via the solid-state method and doped into MgH2 to overcome the drawbacks of MgH2. The onset desorption temperature of the MgH2–10 wt.% Ni0.6Zn0.4O sample was reduced to 285 °C, 133 °C, and 56 °C lower than that of pure MgH2 and milled MgH2, respectively. Furthermore, at 250 °C, the MgH2–10 wt.% Ni0.6Zn0.4O sample could absorb 6.50 wt.% of H2 and desorbed 2.20 wt.% of H2 at 300 °C within 1 h. With the addition of 10 wt.% of Ni0.6Zn0.4O, the activation energy of MgH2 dropped from 133 kJ/mol to 97 kJ/mol. The morphology of the samples also demonstrated that the particle size is smaller compared with undoped samples. It is believed that in situ forms of NiO, ZnO, and MgO had good catalytic effects on MgH2, significantly reducing the activation energy and onset desorption temperature while improving the sorption kinetics of MgH2.

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Section: Resultsmentioning

confidence: 99%

Ni0.6Zn0.4O Synthesised via a Solid-State Method for Promoting Hydrogen Sorption from MgH2

2023

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“…In addition to the preparation of Ti-based catalysts from precursors. Huang et al [84] reported a bimetallic oxide catalyst Sc 2 O 3 /TiO 2 containing Ti element. When 5 wt % Sc 2 O 3 /TiO 2 catalyst is added to MgH 2 , 6.08 wt % H 2 can be absorbed within 300s at 200°C and 6.21 wt % H 2 can be released within 1000s at 300°C.…”

Section: Ti-based Compoundmentioning

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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“…Bimetallic oxide, as a metal oxide material composed of two different metals, has aroused extensive attention concerning many domains including photocatalysis, , dye degradation, , gas sensing, , and electrochemical sensing, − ascribed to the numerous accessible metal active sites and inherent physical–chemical properties. In addition, because different types of metals usually endow target materials with specific functionality, most of the bimetallic oxides lead to enhanced performance because of the synergistic effect between two metals. ,, The common strategies to prepare bimetallic oxides include the sol–gel method, , coprecipitation, , and solvothermal and electrochemical deposition . Despite the fact that many successes have been achieved in the past few decades, bimetallic oxides harvested by current methods tend to agglomerate to some extent, which hinders full contact of the bulk reactants with the inner active sites originating from bimetallic oxides and thus fails to develop potential performance.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, because different types of metals usually endow target materials with specific functionality, most of the bimetallic oxides lead to enhanced performance because of the synergistic effect between two metals. 5,10,11 The common strategies to prepare bimetallic oxides include the sol−gel method, 12,13 coprecipitation, 14,15 and solvothermal 16 and electrochemical deposition. 17 Despite the fact that many successes have been achieved in the past few decades, bimetallic oxides harvested by current methods tend to agglomerate to some extent, which hinders full contact of the bulk reactants with the inner active sites originating from bimetallic oxides and thus fails to develop potential performance.…”

Section: ■ Introductionmentioning

confidence: 99%

Construction of a Hierarchical Structure of Bimetallic Oxide Derived from Metal–Organic Frameworks

et al. 2022

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Bimetallic oxides are a class of promising advanced functional metal nanomaterials, especially in terms of the sophisticated hierarchical structure of bimetallic oxide, which not only is in favor of enhancing their intrinsic physiochemical properties because of more accessible actives sites but also is capable of integrating the synergistic effect between two metals. Herein, we report a novel strategy to controllably construct bimetallic CuO/ZnO nanomaterials with sophisticated hierarchical structure through a pseudomorphic transformation and subsequent calcination process. The resulting unique hierarchical structure of ZnO/CuO is primarily constituted of a nanosphere and a rod grafted in a microscale cube with multidimensional size, which thus results in excellent dispersion, superior charge-transport capability, and abundant accessible active sites. Impressively, the optimized hierarchical structure product of CuO/ZnO (4:1) demonstrates an excellent glucose detection performance with a rapid response time, a wide linear range, a low detection limit, and strong antiinterference ability, realizing more advantages than commercial CuO or ZnO materials and shedding light on the positive correlation of the structure and performance. This study provides a new strategy for the controllable fabrication of the sophisticated hierarchical structure of bimetallic oxide nanomaterials.

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A noteworthy synergistic catalysis on hydrogen sorption kinetics of MgH2 with bimetallic oxide Sc2O3/TiO2

Cited by 37 publications

References 47 publications

Ni0.6Zn0.4O Synthesised via a Solid-State Method for Promoting Hydrogen Sorption from MgH2

Ni0.6Zn0.4O Synthesised via a Solid-State Method for Promoting Hydrogen Sorption from MgH2

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

Construction of a Hierarchical Structure of Bimetallic Oxide Derived from Metal–Organic Frameworks

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