We made use of the Raman spectroscopy to investigate the mechanism of hydrogen adsorption on carbon materials. We have recorded the Raman active roto-vibrational Q branch of adsorbed hydrogen at various temperatures and pressures and we have developed a qualitatively theoretical model for the interpretation of the spectra. Because of the small Raman shifts observed for the Q branch we conclude that no charge transfer phenomena are involved in the interaction with the adsorbing material, but only a simple physisorption takes place; moreover, no C-H stretching signals in the region of (2800–3300) were detected, thus indicating that chemisorption, if any, should be negligible.

Absortion of H2 on Carbon Based Materials: a Study by Raman Spectroscopy

CENTRONE, ANDREA;BRAMBILLA, LUIGI;ZERBI, GIUSEPPE
2005

Abstract

We made use of the Raman spectroscopy to investigate the mechanism of hydrogen adsorption on carbon materials. We have recorded the Raman active roto-vibrational Q branch of adsorbed hydrogen at various temperatures and pressures and we have developed a qualitatively theoretical model for the interpretation of the spectra. Because of the small Raman shifts observed for the Q branch we conclude that no charge transfer phenomena are involved in the interaction with the adsorbing material, but only a simple physisorption takes place; moreover, no C-H stretching signals in the region of (2800–3300) were detected, thus indicating that chemisorption, if any, should be negligible.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/513614
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