Low Temperature Physics: 41, 287 (2015); https://doi.org/10.1063/1.4918898
Fizika Nizkikh Temperatur: Volume 41, Number 4 (April 2015), p. 373-380    ( to contents , go back )

The effect of γ-rays irradiation on hydrogen sorption by nanoporous carbon materials

A.V. Dolbin, V.G. Manzhelii, V.B. Esel’son, V.G. Gavrilko, N.A. Vinnikov, R.M. Basnukaeva, M.V. Khlistyuck, V.P. Maletskii

B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
E-mail: dolbin@ilt.kharkov.ua

V.G. Nikolaev, O.V. Kudriachenko

Институт экспериментальной патологии, онкологии, радиобиологии им. Р.Е. Кавецкого НАН Украины ул. Васильковская, 45, г. Киев, 03025, Украина

I.Yu. Uvarova, N.A. Tripachko

Institute of Physics of the National Academy of Sciences 46 Nauki Ave., Kiev 03028, Ukraine

V.Yu. Koda

G.V. Kurdyumov Institute for Metal Physics, Kyiv UA-03680, Ukraine
pos Анотація:

Received Jule 2, 2014

Abstract

The effect of radioactive irradiation in the atmos-phere of hydrogen upon the H2 sorption with a synthetic porous SCN (spherical carbonite saturated) carbon nanosorbent has been investigated. The irradiation was performed by applying γ-quanta of cobalt-60 (quantum energy of 1.2 MeV and dose of 4,8·107 rad) in the medium of normal hydrogen at P = 1 atm and T = 300 K. The processes of H2 sorption–desorption in the SCN samples before and after the irradiation were investigated at temperatures ranged from 15 to 1173 K. It is found that the irradiation of the SCN samples in the H2 atmosphere increases considerably the quantity of H2 sorbed in the sample. The results obtained are compared with the previous data on the irradiation effect on H2 sorption in single-walled carbon nanotubes. The quantity of hydrogen physically sorbed in the synthetic SCN sorbent irradiated in the H2 atmosphere is four times larger than the quantity of hydrogen physically sorbed in the single-walled carbon nanotubes irradiated under similar conditions. Below 25 K the diffusion of hydrogen in the porous SCN subsystem with the highest diffusion coefficients is practically independent of temperature, which is typical of the case where the tunnel mechanism of diffusion dominates over the thermally activated one.

PACS: 65.80.–g Thermal properties of small particles, nanocrystals, nanotubes, and other related systems.

Key words: carbon nanosorbent, hydrogen sorption, quantum diffusion, γ-rays irradiation.

Published online: February 23, 2015

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