Journal
NANOTECHNOLOGY
Volume 25, Issue 16, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/25/16/165402
Keywords
Cu2O/TiO2 junction; nanocomposite; charge separation; CO2 adsorption; CO2 photoreduction
Funding
- National Basic Research Program of China [2014CB239301]
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Ministry of Education of China
- World Premier International Research Center Initiative (WPI), MEXT, Japan
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Porous-structured Cu2O/TiO2 nanojunction material is successfully fabricated by a facile method via loading Cu2O nanoparticles on the network of a porous TiO2 substrate. The developed Cu2O/TiO2 nanojunction material has a size of several nanometers, in which the p-type Cu2O and n-type TiO2 nanoparticles are closely contacted with each other. The well designed nanojunction structure is beneficial for the charge separation in the photocatalytic reaction. Meanwhile, the porous structure of the Cu2O/TiO2 nanojunction can facilitate the CO2 adsorption and offer more reaction active sites. Most importantly, the gas-phase CO2 photoreduction tests reveal that our developed porous-structured Cu2O/TiO2 nanojunction material exhibits marked photocatalytic activity in the CH4 evolution, about 12, 9, and 7.5 times higher than the pure TiO2, Pt-TiO2, and commercial Degussa P25 TiO2 powders, respectively. The greatly enhanced activity can be attributed to the well designed nanojunction structure combined with the porous structure, which can simultaneously enhance the charge separation efficiency and facilitate the CO2 adsorption.
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