UCL Discovery
UCL home » Library Services » Electronic resources » UCL Discovery

Ultraviolet Radiation Induced Dopant Loss in a TiO2 Photocatalyst

Chadwick, NP; Kafizas, A; Quesada-Cabrera, R; Sotelo-Vazquez, C; Bawaked, SM; Mokhtar, M; Al Thabaiti, SA; ... Parkin, IP; + view all (2017) Ultraviolet Radiation Induced Dopant Loss in a TiO2 Photocatalyst. ACS Catalysis , 7 (2) pp. 1485-1490. 10.1021/acscatal.6b03170. Green open access

[thumbnail of Chadwick_Ultraviolet_Radiation_Induced.pdf]
Preview
Text
Chadwick_Ultraviolet_Radiation_Induced.pdf - Accepted Version

Download (1MB) | Preview

Abstract

Doped TiO2 has been studied with intense interest in recent decades because of its ability to utilize visible wavelengths and enhance the efficiency of photocatalytic processes. Thus, as a class of materials, it is of significant interest for use in environmental ambient energy utilization applications. Using a popular and well-studied form of doped TiO2 (nitrogen doped) as an example, we show how 28 days of UVA irradiation which is identical in intensity with solar conditions is sufficient to cause the UV induced surface segregation and eventual loss of nitrogen dopant species in TiO2. This is evidenced by X-ray photoelectron spectroscopy and transient absorption spectroscopy. The loss of interstitial nitrogen dopants correlates with the eventual permanent loss of photocatalytic activity and visible light absorption. The UV induced loss of dopants in a metal oxide is unprecedented and represents a potential problem where the environmental use of doped metal oxides in applications is concerned.

Type: Article
Title: Ultraviolet Radiation Induced Dopant Loss in a TiO2 Photocatalyst
Open access status: An open access version is available from UCL Discovery
DOI: 10.1021/acscatal.6b03170
Publisher version: http://doi.org/10.1021/acscatal.6b03170
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.
Keywords: dopant loss, doped titanium dioxide, environment, interstitial nitrogen, nitrogen doping, photocatalysis, TiO2, ultraviolet
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.ucl.ac.uk/id/eprint/1547403
Downloads since deposit
175Downloads
Download activity - last month
Download activity - last 12 months
Downloads by country - last 12 months

Archive Staff Only

View Item View Item