Unravelling site-specific photo-reactions of ethanol on rutile TiO2(110)

Jonas Ørbæk Hansen; Regine Bebensee; Umberto Martinez; Søren Porsgaard; Estephania Lira Salazar; Yinying Wei; Lutz Lammich; Zheshen Li; Hicham Idriss; Flemming Besenbacher; Bjørk Hammer; Stefan Wendt

doi:10.1038/srep21990

Unravelling site-specific photo-reactions of ethanol on rutile TiO2(110)

Jonas Ørbæk Hansen, Regine Bebensee, Umberto Martinez, Søren Porsgaard, Estephania Lira Salazar, Yinying Wei, Lutz Lammich, Zheshen Li, Hicham Idriss, Flemming Besenbacher, Bjørk Hammer, Stefan Wendt

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Abstract

Finding the active sites of catalysts and photo-catalysts is crucial for an improved fundamental understanding and the development of efficient catalytic systems. Here we have studied the photo-activated dehydrogenation of ethanol on reduced and oxidized rutile TiO ₂ (110) in ultrahigh vacuum conditions. Utilizing scanning tunnelling microscopy, various spectroscopic techniques and theoretical calculations we found that the photo-reaction proceeds most efficiently when the reactants are adsorbed on regular Ti surface sites, whereas species that are strongly adsorbed at surface defects such as O vacancies and step edges show little reaction under reducing conditions. We propose that regular Ti surface sites are the most active sites in photo-reactions on TiO ₂.

Original language	English
Article number	21990
Journal	Scientific Reports
Volume	6
ISSN	2045-2322
DOIs	https://doi.org/10.1038/srep21990
Publication status	Published - 2016

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title = "Unravelling site-specific photo-reactions of ethanol on rutile TiO2(110)",

abstract = "Finding the active sites of catalysts and photo-catalysts is crucial for an improved fundamental understanding and the development of efficient catalytic systems. Here we have studied the photo-activated dehydrogenation of ethanol on reduced and oxidized rutile TiO 2 (110) in ultrahigh vacuum conditions. Utilizing scanning tunnelling microscopy, various spectroscopic techniques and theoretical calculations we found that the photo-reaction proceeds most efficiently when the reactants are adsorbed on regular Ti surface sites, whereas species that are strongly adsorbed at surface defects such as O vacancies and step edges show little reaction under reducing conditions. We propose that regular Ti surface sites are the most active sites in photo-reactions on TiO 2. ",

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T1 - Unravelling site-specific photo-reactions of ethanol on rutile TiO2(110)

AU - Hansen, Jonas Ørbæk

AU - Bebensee, Regine

AU - Martinez, Umberto

AU - Porsgaard, Søren

AU - Salazar, Estephania Lira

AU - Wei, Yinying

AU - Lammich, Lutz

AU - Li, Zheshen

AU - Idriss, Hicham

AU - Besenbacher, Flemming

AU - Hammer, Bjørk

AU - Wendt, Stefan

PY - 2016

Y1 - 2016

N2 - Finding the active sites of catalysts and photo-catalysts is crucial for an improved fundamental understanding and the development of efficient catalytic systems. Here we have studied the photo-activated dehydrogenation of ethanol on reduced and oxidized rutile TiO 2 (110) in ultrahigh vacuum conditions. Utilizing scanning tunnelling microscopy, various spectroscopic techniques and theoretical calculations we found that the photo-reaction proceeds most efficiently when the reactants are adsorbed on regular Ti surface sites, whereas species that are strongly adsorbed at surface defects such as O vacancies and step edges show little reaction under reducing conditions. We propose that regular Ti surface sites are the most active sites in photo-reactions on TiO 2.

AB - Finding the active sites of catalysts and photo-catalysts is crucial for an improved fundamental understanding and the development of efficient catalytic systems. Here we have studied the photo-activated dehydrogenation of ethanol on reduced and oxidized rutile TiO 2 (110) in ultrahigh vacuum conditions. Utilizing scanning tunnelling microscopy, various spectroscopic techniques and theoretical calculations we found that the photo-reaction proceeds most efficiently when the reactants are adsorbed on regular Ti surface sites, whereas species that are strongly adsorbed at surface defects such as O vacancies and step edges show little reaction under reducing conditions. We propose that regular Ti surface sites are the most active sites in photo-reactions on TiO 2.

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U2 - 10.1038/srep21990

DO - 10.1038/srep21990

M3 - Journal article

C2 - 26915303

SN - 2045-2322

VL - 6

JO - Scientific Reports

JF - Scientific Reports

M1 - 21990

ER -

Unravelling site-specific photo-reactions of ethanol on rutile TiO2(110)

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