Temperature programmed desorption study of pre-irradiated TiO2 anatase in the presence of ethanol. Effect of conduction band electrons on reaction selectivity
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Autor:
Nadeem, M. A. / Idriss, H. (2025)
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Quelle:
Chemical Physics Letters, 2025, 866, 141965
- Datum: Februar 2025
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Abstract
The work addresses one of the fundamentals of photocatalytic reactions, the fate of conduction-band (CB) electrons of a photo-excited TiO2-anatase. Some of these CB-electrons are self-trapped as large-polarons. We have studied by Infrared-spectroscopy these polarons upon UV-excitation in the presence and absence of O2. Moreover, the effect of CB-electrons on chemical reactions was investigated by temperature-programmed-desorption. Over the non-irradiated TiO2, the dehydration and oxidation products dominated, while over that prior UV-irradiated in the presence of ethanol the dehydrogenation product increased and the oxidation pathway was partly suppressed. These changes are attributed to CB-electrons that made the near-surface more metallic.
