Structure modification of Mg–Nb films under hydrogen sorption cycles

Mengucci, P.; Barucca, G.; Majni, G.; Bazzanella, Nicola; Checchetto, R.; Miotello, A.

doi:10.1016/j.jallcom.2010.11.062

Cited by 11 publications

(4 citation statements)

References 13 publications

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“…MgH 2 /Mg and channels for H diffusion. The role of Nb and small clusters as nucleation sites has also been reported by Checchetto et al [135] and Mengucci et al [136] The Mg-A1 hydrogen storage alloy has the advantages of high hydrogen storage capacity and low cost, which determines the possibility of its use in the form of thin film to improve its hydrogen storage properties. Pranevicus et al [137] synthesized a MgAl film with a thickness of about 3 µm to 5 µm using PVD method.…”

Section: Mg Alloy Filmsmentioning

confidence: 54%

An overview of progress in Mg-based hydrogen storage films*

2019

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Mg-based hydrogen storage materials are considered to be one of the most promising solid-state hydrogen storage materials due to their large hydrogen storage capacity and low cost. However, slow hydrogen absorption/desorption rate and excessive hydrogen absorption/desorption temperature limit the application of Mg-based hydrogen storage materials. The present paper reviews the advances in the research of Mg-based hydrogen storage film in recent years, including the advantage of the film, the function theory of fabricating method and its functional theory, and the influencing factors in the technological process. The research status worldwide is introduced in detail. By comparing pure Mg, Pd-caped Mg, non-palladium capped Mg, and Mg alloy hydrogen storage films, an ideal tendency for producing Mg-based film is pointed out, for example, looking for a cheap metal element to replace the high-priced Pd, compositing Mg film with other hydrogen storage alloy of catalytic elements, and so on.

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Section: Mg Alloy Filmsmentioning

confidence: 54%

An overview of progress in Mg-based hydrogen storage films*

2019

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“…Besides, binary Mg-TM alloys may exist as thin films, e.g., Mg-Ti [80] or Mg-Nb [81]. DFT calculations suggest that in thin films Mg may adopt the bcc structure of Nb layers [82][83][84] resulting to an hcp-to-bcc phase transformation of Mg [85].…”

Section: Mg/tm Thin Films and Bcc Mg Phase Stabilitymentioning

confidence: 99%

“…DFT calculations of the hydrogen site solubility in various MgH x structures reveal that for all the studied systems [85,106] except bcc MgH x [85] hydrogen atoms occupy adjacent interstitial sites forming a hydride layer that prevents hydrogen propagation into the Mg bulk. This so-called blocking layer effect is absent in bcc-Mg, in which hydrogen is spread over the lattice without forming clusters, that may explain acceleration of hydrogen sorption kinetics in Mg/Nb multilayers [81,108,109] and Mg@Nb (or Mg@V) composites [6,14,110,111].…”

Section: Modelling Of Hydrogen Diffusion In Bulk Mghxmentioning

confidence: 99%

Hydrogen Diffusion on, into and in Magnesium Probed by DFT: A Review

Shelyapina

2022

Hydrogen

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Hydrogen is an energy carrier that can be a sustainable solution for alternative energy with zero greenhouse gas emissions. Hydrogen storage is a key point for hydrogen energy. Metals provide an access for safe, controlled and reversible hydrogen storage and release. Magnesium, due to its outstanding hydrogen storage capacity, high natural abundance, low cost and non-toxicity is one of the most attractive materials for hydrogen storage. The economic efficiency of Mg as a hydrogen accumulator is limited by its sluggish hydrogen sorption kinetics and high stability of its hydride MgH2. Many attempts have been made to overcome these shortcomings. On a microscopic level, hydrogen absorption by metal is a complex multistep process that is impossible to survey experimentally. Theoretical studies help to elucidate this process and focus experimental efforts on the design of new effective Mg-based materials for hydrogen storage. This review reports on the results obtained within a density functional theory approach to studying hydrogen interactions with magnesium surfaces, diffusion on Mg surfaces, into and in bulk Mg, as well as hydrogen induced phase transformations in MgHx and hydrogen desorption from MgH2 surfaces.

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“…An alloying opportunity provides physical vapour deposition (PVD), which makes it possible to co-deposit Mg with another metal. Thin film compositions can be obtained by PVD, which are of interest for protective purposes of magnesium as well as such subjects as cardiovascular stents, optically switchable mirrors [19,20] or hydrogen storage devices [21][22][23][24][25]. We deposited thin films of Mg-Nb alloys by co-sputtering of individual targets of both components.…”

Section: Introductionmentioning

confidence: 99%

Early stages of Mg–Nb alloy corrosion in a balanced salt solution – STEM-HAADF and EIS study

Leinartas¹,

Juzeliūnas²,

Staišiūnas³

et al. 2020

chemija

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Thin Mg–Nb alloy films having a thickness below 1 µm were deposited by magnetron sputtering on glass substrates with Nb concentrations of 4, 26 and 32 at.%. Distribution of the elements within the deposits was identified by a scanning transmission electron microscope (STEM) equipped with a high angle annular dark field (HAADF) detector, which showed on a nanometer scale fine Nb-enriched structures. XRD identified nano-crystallinity of the deposits with grain sizes of the order of tens of nanometers. The corrosion behaviour of the films has been studied in a balanced salt solution, whose pH and ion concentrations were close to those of the human blood plasma. The electrochemical impedance spectroscopy implied a localized corrosion with diffusion limitations within a layer of corrosion products. The corrosion rates were determined in situ by Tafel extrapolation and EIS-derived polarization resistance; both methods provided reliable results for corrosion resistant alloy with ca. one third of Nb. Alloying of Mg with Nb makes it possible to adjust the corrosion activity of the alloy according to biomedical requirements for in vivo applications.

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Structure modification of Mg–Nb films under hydrogen sorption cycles

Cited by 11 publications

References 13 publications

An overview of progress in Mg-based hydrogen storage films*

An overview of progress in Mg-based hydrogen storage films*

Hydrogen Diffusion on, into and in Magnesium Probed by DFT: A Review

Early stages of Mg–Nb alloy corrosion in a balanced salt solution – STEM-HAADF and EIS study

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