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Carbon coating stabilized Ti3+-doped TiO2 for photocatalytic hydrogen generation under visible light irradiation.
- Source :
- Dalton Transactions: An International Journal of Inorganic Chemistry; 7/28/2015, Vol. 44 Issue 28, p12812-12817, 6p
- Publication Year :
- 2015
-
Abstract
- Self-doping by Ti<superscript>3+</superscript> is a useful method to expand the light response of TiO<subscript>2</subscript> into the visible light region. However, to obtain a stable Ti<superscript>3+</superscript>-doped TiO<subscript>2</subscript> seems to be a challenge due to the easy oxidation of Ti<superscript>3+</superscript> during the heterogeneous reaction. Here, we propose a simple carbon coating route to stabilize the Ti<superscript>3+</superscript>-doped TiO<subscript>2</subscript>, in which both the Ti<superscript>3+</superscript> and precursor of the carbon coating layer were in situ formed from the hydrothermal hydrolysis of titanium isopropoxide. The carbon coated Ti<superscript>3+</superscript>-doped TiO<subscript>2</subscript> exhibited excellent stability for photocatalytic hydrogen production. Based on electron paramagnetic resonance (EPR) analysis, the proposed stabilizing mechanism is that the conductive carbon coating layer as a barrier layer prevents the H<subscript>2</subscript>O and O<subscript>2</subscript> from diffusing into the surface of the photocatalyst, which can oxidize the surface O vacancies and Ti<superscript>3+</superscript> in TiO<subscript>2</subscript>. Our findings offer a simple route to prepare a highly stable TiO<subscript>2</subscript>-based photocatalyst with visible light response. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14779226
- Volume :
- 44
- Issue :
- 28
- Database :
- Complementary Index
- Journal :
- Dalton Transactions: An International Journal of Inorganic Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 103713168
- Full Text :
- https://doi.org/10.1039/c5dt01204j