Isochronal hydrogenation of textured Mg/Pd thin films

Ozgit, Cagla; Akyıldız, Hasan; Őztürk, Tayfur

doi:10.1016/j.tsf.2010.01.023

Cited by 8 publications

(11 citation statements)

References 22 publications

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“…The deposition temperature plays a significant role in the degree of epitaxy and higher temperature improves the crystal quality of the as-grown film. A similar observation was reported on epitaxial and textured Mg-thin films, deposited on sapphire and glass substrates [19,20].…”

Section: Resultssupporting

confidence: 85%

The influence of films thickness on hydrogenation behavior of titanium thin films

Tal-Gutelmacher¹,

Pundt²,

Kirchheim³

2010

J Mater Sci

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Titanium films of different thicknesses were prepared on sapphire substrates in an UHV chamber, by means of ion beam sputter deposition at room temperature, under Ar-atmosphere at the pressure of 1.5Á10 E -4 mbar. For electrochemical hydrogen loading, the films were covered by a 30-nm thick layer of Pd in order to prevent oxidation and facilitate hydrogen absorption. In situ stress measurements were conducted during step-by-step electrochemical hydrogen charging of the films. XRD measurements using a Phillips X-Pert diffractometer with a Co-Ka radiation were performed before and after hydrogenation in order to investigate the effect of hydrogen loading on the microstructure. The phase boundaries, as well as the stress and strain development during hydrogen absorption, depend strongly on the thickness of the films. The main characteristics of absorption behavior of hydrogen, as well as the thermodynamics and phase boundaries of titanium-hydrogen thin films are discussed in detail with specific emphasis on the influence of films thickness. The obtained results are also compared to literature data on the widely studied titanium-hydrogen bulk system. Shifted phase boundaries and narrowed two-phase field appear in Ti-H film system, which are mainly attributed to the microstructural contribution, as well as to the large stresses in the GPa-range that built up between the films and their substrate.

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Section: Resultssupporting

confidence: 85%

The influence of films thickness on hydrogenation behavior of titanium thin films

Tal-Gutelmacher¹,

Pundt²,

Kirchheim³

2010

J Mater Sci

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“…Hydrogenation is also much faster compared to pure Mg during the first cycle, due to a delay in the nucleation of MgD 2 as long as phase segregation is still in progress and the fact that hydrogen diffusion through Mg metal is much faster than through MgD 2 . 49 The XRD results show that phase segregation is almost completed after the first cycle although multiple cycles are usually needed before the properties of the film reach a steady state. 30 In view of the above, NR measurements during the second and later deuteration cycles of a Mg-10%Cr-10%V film could prove very interesting.…”

Section: −17mentioning

confidence: 99%

Probing the Room Temperature Deuterium Absorption Kinetics in Nanoscale Magnesium Based Hydrogen Storage Multilayers Using Neutron Reflectometry, X-ray Diffraction, and Atomic Force Microscopy

et al. 2012

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Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Questions? Contact the NRC Publications Archive team atPublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information. NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://doi.org/10.1021/jp209296bAccess and use of this website and the material on it are subject to the Terms and Conditions set forth at Probing the room temperature deuterium absorption kinetics in nanoscale magnesium based hydrogen storage multilayers using neutron reflectometry, X-ray diffraction, and atomic force microscopy Kalisvaart, W. P.; Luber, E. J.; Poirier, E.; Harrower, C. T.; Teichert, A.; Wallacher, D.; Grimm, N.; Steitz, R.; Fritzsche, H.; Mitlin, D.http://nparc.cisti-icist.nrc-cnrc.gc.ca/fra/droits L'accès à ce site Web et l'utilisation de son contenu sont assujettis aux conditions présentées dans le site LISEZ CES CONDITIONS ATTENTIVEMENT AVANT D'UTILISER CE SITE WEB. NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.cisti-icist.nrc-cnrc.gc.ca/eng/view/object/?id=2fc7cda8-89e6-4fe8-98bd-8e67c8cab317 http://nparc.cisti-icist.nrc-cnrc.gc.ca/fra/voir/objet/?id=2fc7cda8-89e6-4fe8-98bd-8e67c8cab317 ABSTRACT: Magnesium hydride has high storage capacity (7.6 wt % H) but very slow sorption kinetics. Addition of catalytic phases on the surface as well as alloying with transition metals is known to improve the properties. In this study, the sorption kinetics of a 50-nm Mg layer and Mg-10%Cr-10%V layer, capped with a CrV/Pd bilayer catalyst, are compared using a combination of neutron reflectometry (NR), X-ray diffraction (XRD), and atomic force microscopy to elucidate the effects of alloying on the hydrogen storage properties of Mg at room temperature. From NR it is found that the Cr−V alloyed layer shows both a delay in expansion in the first absorption cycle and a delay in contraction in the first desorption, which indicates a delay in nucleation of MgD 2 and formation of substoichiometric MgD 2-δ , respectively. Compared to pure Mg, the kinetics are strongly improved as no blocking MgD 2 layer is formed. XRD showed a strong reduction in the Mg grain size for the Cr−V alloyed layer after one cycle. For pure Mg, the grain size is almost unchanged although t...

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“…To what extent this value is applicable to powders is not known since the film behavior is not necessarily the same as the powder behavior. The behavior in the films could well be affected by their two dimensional nature as in-plane accommodation of stresses are rather difficult in this geometry [16]. The behavior may also be affected by the fact that the films may couple with their substrate [17] and/or with their overlayer [18], which may also alter the stability of their hydride.…”

Section: Resultsmentioning

confidence: 99%

“…Hydrogenation-dehydrogenation experiments were carried out in a purposebuilt set-up described in reference [16]. This was a two-part demountable cell, housing the thin film on a base firmly supported on two electrodes, 12 mm apart, used for electrical resistance measurements.…”

Section: Methodsmentioning

confidence: 99%