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
2005-01-01
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
