Stability of hydrogenated silica glass and desorption kinetics of molecular hydrogen

[Display omitted] •Silica glass was hydrogenated at high hydrogen pressure and temperature.•Hydrogen desorption was studied by tracking time dependence of Raman spectra.•The intensity of hydrogen phonon bands exponentially decreases with annealing time.•The activation energy of desorption 0.16 eV wa...

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Published inChemical physics letters Vol. 793; p. 139477
Main Authors Meletov, K.P., Efimchenko, V.S.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 16.04.2022
Subjects
High pressure
Hydrogen desorption
Hydrogen-storage solids
Raman scattering
Hydrogen desorption
Raman scattering
Hydrogen-storage solids
High pressure
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Summary:[Display omitted] •Silica glass was hydrogenated at high hydrogen pressure and temperature.•Hydrogen desorption was studied by tracking time dependence of Raman spectra.•The intensity of hydrogen phonon bands exponentially decreases with annealing time.•The activation energy of desorption 0.16 eV was determined from Arrhenius plot. The stability of saturated solid solutions of molecular hydrogen in silica glass was examined in the temperature range 85 ÷ 175 K by Raman spectroscopy. The kinetics of hydrogen desorption was studied in-situ by tracking time-dependent changes in the intensities of hydrogen rotational modes at an elevated temperature. The heating results in an exponential decrease in the hydrogen content with a temperature dependent time constant. The data at different temperatures are well described by the Arrhenius formula showing the activation character of desorption with the activation energy EA = (0.16 ± 0.01) eV and time constant A = (0.027 ± 0.003) sec.
ISSN:0009-2614
1873-4448
DOI:10.1016/j.cplett.2022.139477