Issue 32, 2017

The origin of enhanced photocatalytic activities of hydrogenated TiO2 nanoparticles

Abstract

The photocatalytic activity of semiconductors is largely governed by their light absorption, separation of photoinduced charge carriers and surface catalytically active sites, which are primarily controlled by the morphology, crystalline size, structure, and especially the electronic structure of photocatalysts. Black TiO2 is recognized as one of the most promising visible-light photocatalysts, due to its significantly enhanced visible-light photocatalytic performance in comparison to intrinsic TiO2. In this work, black TiO2 is synthesized through the hydrogenation process. The sample shows a TiO2@TiO2−x core/shell structure which is attributed to hydrogenation. By using X-ray photoelectron spectroscopy (XPS), X-ray absorption spectroscopy (XAS), and nuclear magnetic resonance (NMR) spectroscopy, we identified the featured midgap electronic states in black TiO2, which gave rise to the TiO2−x shell layer. These states lead to the improvement of visible-light absorption and the separation of photoinduced charge carriers, which consequently result in remarkable enhanced photocatalytic activities in black TiO2.

Graphical abstract: The origin of enhanced photocatalytic activities of hydrogenated TiO2 nanoparticles

Supplementary files

Article information

Article type
Paper
Submitted
08 Mac 2017
Accepted
08 Mei 2017
First published
08 Mei 2017

Dalton Trans., 2017,46, 10694-10699

The origin of enhanced photocatalytic activities of hydrogenated TiO2 nanoparticles

Y. Liu, H. Feng, X. Yan, J. Wang, H. Yang, Y. Du and W. Hao, Dalton Trans., 2017, 46, 10694 DOI: 10.1039/C7DT00827A

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