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Issue 17, 2014
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A facile and versatile method for preparation of colored TiO2 with enhanced solar-driven photocatalytic activity

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Abstract

Colored TiO2 has attracted enormous attention due to its visible light absorption and excellent photocatalytic activity. In this report, we develop a simple and facile solid-state chemical reduction approach for a large-scale production of colored TiO2 at mild temperature (300–350 °C). The obtained sample possesses a crystalline core/amorphous shell structure (TiO2@TiO2−x). The oxygen vacancy results in the formation of a disordered TiO2−x shell on the surface of TiO2 nanocrystals. XPS and theoretical calculation results indicate that valence band tail and vacancy band below the conduction band minimum appear for the TiO2−x, which implies that the TiO2@TiO2−x nanocrystal has a narrow band gap and therefore leads to a broad visible light absorption. Oxygen vacancy in a proper concentration promotes the charge separation of photogenerated carriers, which improves the photocatalytic activity of TiO2@TiO2−x nanocrystals. This facile and general method could be potentially used for large scale production of colored TiO2 with remarkable enhancement in the visible light absorption and solar-driven H2 production.

Graphical abstract: A facile and versatile method for preparation of colored TiO2 with enhanced solar-driven photocatalytic activity

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Article information


Submitted
16 May 2014
Accepted
11 Jun 2014
First published
13 Jun 2014

Nanoscale, 2014,6, 10216-10223
Article type
Paper
Author version available

A facile and versatile method for preparation of colored TiO2 with enhanced solar-driven photocatalytic activity

H. Tan, Z. Zhao, M. Niu, C. Mao, D. Cao, D. Cheng, P. Feng and Z. Sun, Nanoscale, 2014, 6, 10216
DOI: 10.1039/C4NR02677B

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