Microwave-assisted reduction of Ti species in MgH2-TiO2 composite and its effect on hydrogen storage

Zou, Ren; Bolarin, Joshua Adedeji; Lei, Gangtie; Gao, Wenbo; Li, Zhi; Cao, Hujun; Chen, Ping

doi:10.1016/j.cej.2022.138072

Cited by 23 publications

(6 citation statements)

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“…A previous work discovered that the performance of hydrogen storage MgH 2 is significantly improved by the inclusion of metal oxide as a catalyst or additive [ 69 ]. 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 .…”

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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“…Later, the positive effect of multivalent Ti species in MgH 2 -TiO 2 on the hydrogen storage performance of MgH 2 was explored several times. Zou et al [ 113 ] found that the synergistic effect of microwave irradiation and heating contributed to the homogeneous dispersion of defective TiO 2−x species around Mg/MgH 2 and promoted the reduction of Ti 4+ to lower valence states. TiO 2−x and multivalent Ti species are catalysts for electron transfer between Mg 2+ and H − , thus promoting the diffusion of hydrogen.…”

Section: Improvement Of Hydrogen Storage Performance Of Mg/mgh ...mentioning

confidence: 99%

Hydrogen Storage Performance of Mg/MgH2 and Its Improvement Measures: Research Progress and Trends

Yang

Zhang

et al. 2023

Materials

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Due to its high hydrogen storage efficiency and safety, Mg/MgH2 stands out from many solid hydrogen storage materials and is considered as one of the most promising solid hydrogen storage materials. However, thermodynamic/kinetic deficiencies of the performance of Mg/MgH2 limit its practical applications for which a series of improvements have been carried out by scholars. This paper summarizes, analyzes and organizes the current research status of the hydrogen storage performance of Mg/MgH2 and its improvement measures, discusses in detail the hot studies on improving the hydrogen storage performance of Mg/MgH2 (improvement measures, such as alloying treatment, nano-treatment and catalyst doping), and focuses on the discussion and in-depth analysis of the catalytic effects and mechanisms of various metal-based catalysts on the kinetic and cyclic performance of Mg/MgH2. Finally, the challenges and opportunities faced by Mg/MgH2 are discussed, and strategies to improve its hydrogen storage performance are proposed to provide ideas and help for the next research in Mg/MgH2 and the whole field of hydrogen storage.

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“…In the recent few years, microwaves have been widely used in material synthesis and process intensification to achieve better results and determine which technique could create a uniform temperature of samples and generate a temperature gradient from the hot surface of a sample particle to its interior. [16][17][18][19][20][21][22][23] Xiong et al 16 also observed that an Fe-Ce-Ti mixed oxide catalyst prepared by microwave hydrothermal treatment had better NH 3 -SCR activity. It is well accepted that the microwave effect mainly depends on the ability of a specific material to absorb microwave energy and convert it into heat.…”

Section: Introductionmentioning

confidence: 99%

Unveiling the role of microwave induction on V₂O₅@AC catalysts with enhanced activity for low temperature NH₃-SCR reaction: an experimental and DFT study

cheng

Song

et al. 2023

Environ. Sci.: Nano

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Microwave-assisted reduction of Ti species in MgH2-TiO2 composite and its effect on hydrogen storage

Cited by 23 publications

References 51 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

Hydrogen Storage Performance of Mg/MgH2 and Its Improvement Measures: Research Progress and Trends

Unveiling the role of microwave induction on V₂O₅@AC catalysts with enhanced activity for low temperature NH₃-SCR reaction: an experimental and DFT study

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Microwave-assisted reduction of Ti species in MgH2-TiO2 composite and its effect on hydrogen storage

Cited by 23 publications

References 51 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

Hydrogen Storage Performance of Mg/MgH2 and Its Improvement Measures: Research Progress and Trends

Unveiling the role of microwave induction on V2O5@AC catalysts with enhanced activity for low temperature NH3-SCR reaction: an experimental and DFT study

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Unveiling the role of microwave induction on V₂O₅@AC catalysts with enhanced activity for low temperature NH₃-SCR reaction: an experimental and DFT study