Structure and adsorption abilities of nanoporous Ti,V-(N, He) coatings.
|Alexsey Guglya 1, Aleksander Goncharov 1, Victor Kolobrodov 1, Ruslan Vasilenko 1, Yuriy Nikitenko 2|
1. Kharkov Institute of Physics and Technology (KIPT), Akademiskaja 1, Kharkov 61108, Ukraine
The basic idea of this work is to create nanocrystalline composite materials with high level of porosity and good adsorption properties. It was investigated structure and adsorption characteristics Ti,V-(N, He) coatings deposited onto Ti substrate using the ion-beam assisted deposition technology. The results of the research show that the ion beam assisted deposition can be used to obtain nanoporous structures. It was shown that Ti and V deposition during high energy N2 and He ions bombardment leads to nanocrystalline fcc structures formation with equiaxed and fine-dispersed pores. The average size of grains in V-(N2, He) and Ti-(N2, He) coatings is equal 20 nm, porous – 15 nm. Beside equiaxed pores there are many long, presumably gas-vacancy, 100-200 nm length formations. These formations create the system of inner cannels in coatings. The average size of grains in Ti,V-(N2, He) coatings is equal
The results of adsorption studies showed that the obtained structures have a rather developed inner specific surface: Ti-(N2, He) – 20.3 m2/g, V-(N2, He) – 38.3 m2/g, Ti,V-(N2, He) - 69 m2/g. From studying of isotherm of adsorption it has been established that the main contribution to the process of hydrogen storage at low temperatures is made by the created porous structure. For all coatings took place the increasing of hydrogen adsorption from the pressure ~ 0.15 MPa. The largest specific quantity hydrogen was adsorbed by Ti,V – (N2, He) structure - ~ 350 cm2/g. At elevated temperatures the absorption capacity of the intermetallide and nitride phases may increase.
Presentation: Invited oral at E-MRS Fall Meeting 2009, Symposium I, by Alexsey Guglya
See On-line Journal of E-MRS Fall Meeting 2009
Submitted: 2009-05-08 09:32 Revised: 2009-06-07 00:48
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