Liu, B;
Wang, J;
Parkin, IP;
Zhao, X;
(2021)
The effect of Cu dopants on electron transfer to O-2 and the connection with acetone photocatalytic oxidations over nano-TiO2 dagger.
Physical Chemistry Chemical Physics
, 23
(14)
pp. 8300-8308.
10.1039/d1cp00118c.
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Abstract
Modifying TiO2 with the Cu element has been shown to be useful for photocatalysis. Although it had been known that Cu species could trap electrons from TiO2, whether they can affect the kinetics of electron transfer and how this can contribute to photocatalysis still remain unknown. In the current research, Cu–TiO2 samples were firstly prepared with a hydrothermal reaction and characterized in detail. It was shown that Cu elements were doped in the TiO2 lattice in +1/0 valence states and have a minor effect on the TiO2 structure. By means of photoconductances, it is shown that the Cu dopants could catalyze the electron transfer from TiO2 to O2 by reducing the apparent activation energy (Eapp) by about 2 times. The photocatalytic experiments conducted at different temperatures showed that the Eapp of the acetone photocatalytic oxidations could be decreased by B2 times; this implies that the Cu dopants change the photocatalytic pathway. First-principles computation showed that the surface Cu dopants, along with the compensated oxygen vacancies, can mediate both of the electron and hole transfer. By combining other studies, we proposed that the Cu sites could act as Lewis acid and base pairs that could combine with acetone and O2 molecules under UV light illumination; this allows electron transfer to O2 via the Cu sites that then react with acetone. As compared to pure TiO2 surfaces, the different chemical environment of the Cu sites leads to the decrease in the Eapp of photocatalysis.
| Type: | Article |
|---|---|
| Title: | The effect of Cu dopants on electron transfer to O-2 and the connection with acetone photocatalytic oxidations over nano-TiO2 dagger |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1039/d1cp00118c |
| Publisher version: | http://dx.doi.org/10.1039/d1cp00118c |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10129816 |
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