Glass, D;
Quesada-Cabrera, R;
Bardey, S;
Promdet, P;
Sapienza, R;
Keller, V;
Maier, SA;
... Cortés, E; + view all
(2021)
Probing the Role of Atomic Defects in Photocatalytic Systems through Photoinduced Enhanced Raman Scattering.
ACS Energy Letters
, 6
pp. 4273-4281.
10.1021/acsenergylett.1c01772.
(In press).
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Abstract
Even in ultralow quantities, oxygen vacancies (VO) drastically impact key properties of metal oxide semiconductors, such as charge transport, surface adsorption, and reactivity, playing central roles in functional materials performance. Current methods used to investigate VO often rely on specialized instrumentation under far from ideal reaction conditions. Hence, the influence of VO generated in situ during catalytic processes has yet to be probed. In this work, we assess in situ extrinsic surface VO formation and lifetime under photocatalytic conditions which we compare to photocatalytic performance. We show for the first time that lifetimes of in situ generated atomic VO play more significant roles in catalysis than their concentration, with strong correlations between longer-lived VO and higher photocatalytic activity. Our results indicate that enhanced photocatalytic efficiency correlates with goldilocks VO concentrations, where VO densities must be just right to encourage carrier transport while avoiding charge carrier trapping.
| Type: | Article |
|---|---|
| Title: | Probing the Role of Atomic Defects in Photocatalytic Systems through Photoinduced Enhanced Raman Scattering |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1021/acsenergylett.1c01772 |
| Publisher version: | https://doi.org/10.1021/acsenergylett.1c01772 |
| Language: | English |
| Additional information: | This is an Open Access article published under a Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) Licence (https://creativecommons.org/licenses/by-nc-nd/4.0/). |
| Keywords: | Photocatalysis, Oxides, Raman spectroscopy, Catalytic activity, Defects |
| 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 UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10138998 |
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