Pressure-composition isotherms of hydrogen and deuterium in vanadium films measured with a vibrating quartz microbalance

Papathanassopoulos, K.; Wenzl, H.

doi:10.1088/0305-4608/12/7/009

Cited by 73 publications

(21 citation statements)

References 17 publications

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“…Apart from the bulk hydride storage systems, three research groups, i.e. Wenzl (1982Wenzl ( , 1983 group in Germany, Eatons (1981) group in USA and Ron (1978) group in Italy, are working in the field of thin film hydrogen storage systems.…”

Section: Hydrogen Absorption Mechanismmentioning

confidence: 99%

“…For thin films, however, an effective clamping is obtained by evaporating them on a massive substrate (Bakker and de Bruin-Hordijk, 1985;Ron and Elemelach, 1978) (f) Protective surface coating could be done on a thin film to stop poisioningby oxygen and other gases (Papathanassopoulos and Wenzl, 1982) .…”

Section: Hydrogen Absorption Mechanismmentioning

confidence: 99%

“…The removal of these layers increases the absorption rate of hydrogen by several orders of magnitude. It was found that vanadium films (Papathanassopoulos and Wenzl, 1982) which are vapour deposited in situ in an ultra high vacuum system show rather large absorption and desorption rates. These rates can also be enhanced by depositing a thin palladium film on top of the vanadium film sample immediately after preparations.…”

Section: Sample Preparationmentioning

confidence: 99%

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Thin Film Hydrogen Storage System

Jain

Vijay

1987

Progress in Hydrogen Energy

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Section: Hydrogen Absorption Mechanismmentioning

confidence: 99%

Section: Hydrogen Absorption Mechanismmentioning

confidence: 99%

Section: Sample Preparationmentioning

confidence: 99%

See 1 more Smart Citation

Thin Film Hydrogen Storage System

Jain

Vijay

1987

Progress in Hydrogen Energy

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“…Figure 1. Pressure-concentration constitution diagram for hydride VH x (summarized data from [13]). Dot line is related to the state when this hydride may be used as hydrogen storage.…”

Section: Introductionmentioning

confidence: 99%

Nanocrystalline Porous Thin Film VNx Hydrogen Absorbents: Method of Production, Structure and Properties

Guglya¹,

Kalchenko²,

Solopikhina³

et al. 2016

JAN

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Abstract. Vanadium and its alloy-based hydrides are extensively studied with regard to their use as hydrogen absorbents. The ion beam-assisted deposition method (IBAD) used for nanocrystalline VN x -H y thin-film hydrogen storages production is analyzed. The data of transmission and scanning electron microscopic studies of all stages of the film formation are considered. The main mechanisms of intergranular pores formation in nanograin structures have been established. The relation between the parameters of the ion beam-assisted deposition and those of film structure has been shown. The obtained data provide the explanation of the mechanisms of hydrogen absorption and desorption by thin films. It was suggested that the availability of branched network of intergranular pores allows accumulating the hydrogen by VN x -H y nano structures in large quantities and release it at the temperatures less than 275°C.Keywords: Nanocrystalline structures; hydrogen; storage; thin films; ion-beam assisted deposition. IntroductionVacuum deposition techniques, such as magnetron sputtering, physical and chemical vapor deposition, have been successfully used for thin films deposition for a long time. A characteristic feature of these techniques is that the resulting structures are formed under less than equilibrium conditions allowing the creation of materials with unique properties. B. Movchan and A.Dymchishin in 1969 [1] have shown the substrate temperature influence on the structure of Ti, Ni, W, ZrO 2 , and Al 2 O 3 films. Evaporation of the substances was carried out by the electron beam heating of the crucible. Three temperature zones with boundary temperatures T 1 and T 2 , that are respectively equal to 0.3 and 0.45 ... 0.5 of T m for metals, 0.22 ...0.26 and 0.45 ... 0.5 of T m for oxides were determined. The films with certain structure and properties have been formed inside each of these zones. These studies marked the beginning of the so-called structure zone model (SZM). Later J. Thornton [2] took into account the effect of the gas environment on the film structure additionally to the influence of the substrate temperature. It was shown that the film formation mechanism during ion bombardment was fundamentally changed not only by substrate temperature but also by pressure of the working gas (argon). Effect of the reactive gas (oxygen) on the formation of the microstructure of thermally evaporated metal (in that case, aluminum) has been studied in detail by P. Barna and M. Adamik [3]. Oxygen adsorbed on the surface during deposition reduces the mobility of grain nucleating centers and inhibits their coalescence. It results in the breaking of the columnar structure and nucleation of the grains with different texture. Eventually, at a high concentration of oxygen molecules, formation of aluminum oxide matrix with metallic inclusions is observed.The substrate temperature and gas concentration influence the formation of the film structure only at the initial stage. At this stage, the density of nucleation centers is determ...

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“…Figure 2 shows the results of hydrogen absorption for VN x and TiN x films. The data on hydrogen absorption by vanadium and titanium taken from [4][5][6] [4] and TiH x [5,6]. DOE requirements are shown for comparisons.…”

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confidence: 99%

Nano Crystalline Porous Thin Film Hydrogen Storages

Guglya¹,

Lyubchenko²

2017

JNMR

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The results of high-resolution transmission electron microscopy revealed that TiNx and VNx films consist of 150-200 nm particles, which boundaries contain nano-pores of 10-15 nm diameters. Particles themselves consist from randomly oriented 10-20 nm nano-grains. Examination of the absorption characteristics of VNx and TiNx films showed that the amount of absorbed hydrogen depends very little on the chemical composition of films, but it is determined by pore structure. The amount of absorbed hydrogen at 0.3 MPa and 20°C is 6-7 wt.%, whereas, the bulk of the hydrogen is accumulated in the grain boundaries and pores.

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Pressure-composition isotherms of hydrogen and deuterium in vanadium films measured with a vibrating quartz microbalance

Cited by 73 publications

References 17 publications

Thin Film Hydrogen Storage System

Thin Film Hydrogen Storage System

Nanocrystalline Porous Thin Film VNx Hydrogen Absorbents: Method of Production, Structure and Properties

Nano Crystalline Porous Thin Film Hydrogen Storages

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