Enhanced Hydrogen Storage Properties of MgH2 Using a Ni and TiO2 Co-Doped Reduced Graphene Oxide Nanocomposite as a Catalyst

Zeng, Liang; Qing, Peilin; Cai, Fangfang; Huang, Xiantun; Liu, Haizhen; Lan, Zhiqiang; Guo, Jin

doi:10.3389/fchem.2020.00207

Cited by 19 publications

(2 citation statements)

References 29 publications

(31 reference statements)

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“…After activation, the reversible reaction of the hydrogen cycle is the synthesis and decomposition of MgH 2 and Mg 2 NiH 4 . According to the related literature, 25,26 PrH 2 has high thermal stability and is not easy to decompose. Secondly, the PR element with appropriate electronegativity in PrH 2 will weaken the Mg H bond 27 and significantly reduce the energy barrier overcome in a dehydrogenation reaction.…”

Section: Phase Composition and Microstructurementioning

confidence: 99%

Hydrogen storage kinetics and thermodynamics of Mg‐based alloys by rare earth doping and Ni substitution

Bu¹,

Peng²,

Liu³

et al. 2022

J of Chemical Tech & Biotech

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BACKGROUND The traditional means of hydrogen storage cannot meet the widespread application of hydrogen energy. Therefore, developing new and efficient hydrogen storage materials and safe hydrogen storage technology is a top priority, which can effectively solve the problem of hydrogen storage and delivery. Its development and application are of great significance to environmental protection and energy development. RESULTS Pr5Mg95−xNix (x = 5, 10, 15) were prepared by induction furnace melting, and the effect of Ni content on the kinetics and thermodynamics of the alloys were systematically investigated. The phase composition, microstructure and storage properties of gaseous hydrogen were investigated using X‐ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that the change in Ni content significantly improves the kinetic properties of the alloys in terms of adsorption and desorption. However, it has little effect on the thermodynamic properties of the alloys. CONCLUSION The lattice of the alloys expands after hydrogenation and shrinks after the release of hydrogen. The change of lattice stress leads to cracking or even fracture of alloy particles and, the higher the nickel content, the more cracks there are. Thus, the specific surface area of the alloys is increased and the contact area with hydrogen is expanded, promoting hydrogen diffusion within the material and improving the hydrogen absorption and desorption rate. Furthermore, as the Ni content increases, the dehydrogenation activation energy of the alloys decreases significantly, which is the main reason for the improved dehydrogenation kinetics of the alloys. © 2021 Society of Chemical Industry (SCI).

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Section: Phase Composition and Microstructurementioning

confidence: 99%

Hydrogen storage kinetics and thermodynamics of Mg‐based alloys by rare earth doping and Ni substitution

Bu¹,

Peng²,

Liu³

et al. 2022

J of Chemical Tech & Biotech

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“…However, the unfavorably high thermal stability and sluggish dehydrogenation kinetics significantly limit its practical application ( Luo et al, 2019 ; Zhang et al, 2020a ). Many attempts have been carried out to improve the dehydrogenation and rehydrogeantion properties of MgH 2 , including alloying ( Hardian et al, 2018 ; Hui et al, 2020 ; Ali and Ismail, 2021 ), nanoengineering ( Zhang et al, 2020a ; Zhang et al, 2021c ; Thi Thu et al, 2021 ), and catalyst addition ( Zhong et al, 2018 ; Li et al, 2019b ; Liu et al, 2020b ; Zhang et al, 2020b ; Ding et al, 2020 ; Singh et al, 2020 ; Sun et al, 2020 ; Wang and Deng, 2020 ; Yao et al, 2020 ; Zeng et al, 2020 ; Zhu et al, 2020 ; Lu et al, 2021a ; Lu et al, 2021b ; Liu et al, 2021c ; Liu et al, 2021 ), etc. Li is also a H-absorbing metal and has a hydrogen capacity of 11.5 wt.%.…”

Section: Introductionmentioning

confidence: 99%

Co-Addition of Mg2Si and Graphene for Synergistically Improving the Hydrogen Storage Properties of Mg−Li Alloy

et al. 2021

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Mg−Li alloy possesses a high hydrogen capacity. However, the hydrogenation and dehydrogenation performances are still far from practical application. In this work, Mg2Si (MS) and graphene (G) were employed together to synergistically improve the hydrogen storage properties of Mg−Li alloy. The structures of the samples were studied by XRD and SEM methods. The hydrogen storage performances of the samples were studied by nonisothermal and isothermal hydrogenation and dehydrogenation, thermal analysis, respectively. It is shown that the onset dehydrogenation temperature of Mg−Li alloy was synergistically reduced from 360°C to 310°C after co-addition of Mg2Si and graphene. At a constant temperature of 325°C, the Mg−Li−MS−G composite can release 2.7 wt.% of hydrogen within 2 h, while only 0.2 wt.% of hydrogen is released for the undoped Mg−Li alloy. The hydrogenation activation energy of the Mg−Li−MS−G composite was calculated to be 86.5 kJ mol−1. Microstructure and hydrogen storage properties studies show that graphene can act as a grinding aid during the ball milling process, which leads to a smaller particle size for the composites. This work demonstrates that coaddition of Mg2Si and graphene can synergistically improve the hydrogen storage properties of Mg−Si alloy and offers an insight into the role of graphene in the Mg−Li−MS−G composite.

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Review on Hydrogen Storage Performance of MgH₂: Development and Trends

2021

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Hydrogen storage technology is related to the process of hydrogen energy market. Efficient and safe hydrogen storage materials have always been the goal pursued by people. In the past few years, oceans of materials for hydrogen storage have been researched, MgH2 is considered to be one of the most potential hydrogen storage materials due to its high hydrogen storage capacity, good reversibility and price advantage. However, its development has been limited by its good thermodynamic stability and slow dehydrogenation kinetics. In this paper, the improvement of hydrogen storage performance of MgH2 is summarized from catalyst doping, MgH2 nanosizing, alloying and the construction of composite system. In particular, catalyst doping and MgH2 nanosizing will be more effective modification strategies. With the development of nanotechnology, monatomic catalyst will also become a research hotspot. In view of the changes in thermodynamic properties caused by the nanofabrication of MgH2, the loadless freestanding nano MgH2 will undoubtedly receive more attention.

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Enhanced Hydrogen Storage Properties of MgH2 Using a Ni and TiO2 Co-Doped Reduced Graphene Oxide Nanocomposite as a Catalyst

Cited by 19 publications

References 29 publications

Hydrogen storage kinetics and thermodynamics of Mg‐based alloys by rare earth doping and Ni substitution

Hydrogen storage kinetics and thermodynamics of Mg‐based alloys by rare earth doping and Ni substitution

Co-Addition of Mg2Si and Graphene for Synergistically Improving the Hydrogen Storage Properties of Mg−Li Alloy

Review on Hydrogen Storage Performance of MgH₂: Development and Trends

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Enhanced Hydrogen Storage Properties of MgH2 Using a Ni and TiO2 Co-Doped Reduced Graphene Oxide Nanocomposite as a Catalyst

Cited by 19 publications

References 29 publications

Hydrogen storage kinetics and thermodynamics of Mg‐based alloys by rare earth doping and Ni substitution

Hydrogen storage kinetics and thermodynamics of Mg‐based alloys by rare earth doping and Ni substitution

Co-Addition of Mg2Si and Graphene for Synergistically Improving the Hydrogen Storage Properties of Mg−Li Alloy

Review on Hydrogen Storage Performance of MgH2: Development and Trends

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Review on Hydrogen Storage Performance of MgH₂: Development and Trends