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Surface analysis of N-doped TiO2 nanorods and their enhanced photocatalytic oxidation activity

Authors
Hwang, Yun JeongYang, SenaLee, Hangil
Issue Date
May-2017
Publisher
ELSEVIER SCIENCE BV
Keywords
Nitrogen doping; TiO2 nanorods; Photocatalytic oxidation; Defect; HRPES; STXM
Citation
APPLIED CATALYSIS B-ENVIRONMENTAL, v.204, pp 209 - 215
Pages
7
Journal Title
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume
204
Start Page
209
End Page
215
URI
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/8529
DOI
10.1016/j.apcatb.2016.11.038
ISSN
0926-3373
1873-3883
Abstract
We investigated the presence of Ti3+ defect sites on the surfaces of N-doped TiO2 nanorods by using scanning transmission X-ray microscopy (STXM) and high-resolution photoemission spectroscopy (HRPES). The photo-oxidation activities of different types of N-doped TiO2 nanorods were compared with each other and with their undoped nanorods. These nanorods were used to photocatalyze the oxidation of thiol molecules (i.e. 2-mercaptoethanol, benzenethiol, and 2-aminothiophenol) to disulfide and sulfonic (-SO3H) species, and the conversion of CO to CO2, and their photocatalytic activities towards these reactions were assessed using HRPES and a residual gas analyzer, respectively. Conversion to further oxidized sulfonic species was only achieved on the N-doped TiO2 surface compared to the non-doped TiO2 nanorods. In addition, we found that longer N-doped TiO2 nanorods (NTR-150) showed higher photo oxidation activity than NTR-60, which resulted from their increased number of defect sites and narrowed band-gap. (C) 2016 Elsevier B.V. All rights reserved.
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