Porous-structured Cu_2O/TiO_2 nanojunction material toward efficient CO_2 photoreduction

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作   者：

Hua Xu;  Shuxin Ouyang;  Lequan Liu;  Defa Wang;  Tetsuya Kako;  Jinhua Ye; 

作者机构：

Tianjin 300072;  Tsukuba 305-0044;  Environmental Remediation Materials Unit;  National Institute for Materials Science (NIMS);  School of Materials Science and Engineering;  Japan;  and Tianjin Key Laboratory of Composite and Functional Materials;  People’s Republic of China;  Nankai District;  1-1 Namiki;  92 Weijin Road;  Tianjin University;  TU-NIMS Joint Research Center; 

关键词：

CO_2 photoreduction;  charge separation;  Cu_2O/TiO_2 junction;  nanocomposite;  CO_2 adsorption; 

期刊名称：

Nanotechnology

i s s n：

0957-4484

年卷期：

2014 年 25 卷 16 期

页   码：

165402-1-165402-8

页   码：

摘   要：

Porous-structured Cu_2O/TiO_2 nanojunction material is successfully fabricated by a facile method via loading Cu_2O nanoparticles on the network of a porous TiO_2 substrate. The developed Cu_2O/TiO_2 nanojunction material has a size of several nanometers, in which the p-type Cu_2O and n-type TiO_2 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 Cu_2O/TiO_2 nanojunction can facilitate the CO_2 adsorption and offer more reaction active sites. Most importantly, the gas-phase CO_2 photoreduction tests reveal that our developed porous-structured Cu_2O/TiO_2 nanojunction material exhibits marked photocatalytic activity in the CH_4 evolution, about 12, 9, and 7.5 times higher than the pure TiO_2, Pt–TiO_2, and commercial Degussa P25 TiO_2 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 CO_2 adsorption.