Complex doping chemistry owing to Mn incorporation in nanocrystalline anatase TiO2 powders

Guo, Meilan ORCID: 0000-0001-6550-1699, Gao, Yun and Shao, Guosheng (2016) Complex doping chemistry owing to Mn incorporation in nanocrystalline anatase TiO2 powders. Physical Chemistry Chemical Physics, 18 (4). pp. 2818-2829. ISSN 1463-9084

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Official URL: http://pubs.rsc.org/en/content/articlepdf/2016/CP/...

Abstract

Mn-doped TiO2 powders with a wide range of nominal doping levels were fabricated using a one-step hydrothermal method followed by 400 °C annealing. Anatase powders with a uniform size distribution below 10 nm were obtained. The maximum solubility of Mn in the TiO2 lattice was around 30%, beyond which the Mn3O4 compound appeared as a secondary phase. The optical absorption edges for Mn-doped anatase TiO2 were red-shifted effectively through increasing Mn content. Alloying chemistry and associated elemental valences were elaborated through combining X-ray photoelectron spectroscopy (XPS), X-ray absorption spectroscopy (XAS), and theoretical simulation in the framework of density functional theory (DFT). The results showed that the Mn species exhibited mixed valence states of 3+ and 4+ in anatase TiO2, with the latter being the key to remarkable photocatalytic performance.

Item Type: Article
Uncontrolled Keywords: Physical and Theoretical Chemistry, General Physics and Astronomy
Subjects: T Technology > TP Chemical technology
Divisions: University of Bolton Research Centres > Institute for Renewable Energy and Environmental Technologies
SWORD Depositor: JISC Publications Router
Depositing User: JISC Publications Router
Date Deposited: 07 Dec 2017 13:38
Last Modified: 07 Mar 2018 15:03
Identification Number: 10.1039/c5cp05318h
Funders: Technology Strategy Board; FundRef: 10.13039/501100000396, National Natural Science Foundation of China; Grant num: 91233101; FundRef: 10.13039/501100001809, National Natural Science Foundation of China; Grant num: 111174256; FundRef: 10.13039/501100001809, National Natural Science Foundation of China; Grant num: 51001091; FundRef: 10.13039/501100001809
URI: http://ubir.bolton.ac.uk/id/eprint/1225

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