title: Synthesis, characterization and enhanced photocatalytic CO2 reduction activity of graphene supported TiO2 nanocrystals with coexposed {001} and {101} facets.
abstract: It is known that the combination of TiO2 and graphene and the control of TiO2 crystal facets are both effective routes to improve the photocatalytic performance of TiO2. Here, we report the synthesis and the photocatalytic CO2 reduction performance of graphene supported TiO2 nanocrystals with coexposed {001} and {101} facets (G/TiO2-001/101). The combination of TiO2 and graphene enhanced the crystallinity of TiO2 single nanocrystals and obviously improved their dispersion on graphene. The "surface heterojunction" formed by the coexposed {001} and {101} facets can promote the spatial separation of photogenerated electrons and holes toward different facets and the supports of graphene can further enhance the separation through accelerated electron migration from TiO2 to graphene. The G/TiO2-001/101 exhibited high photocatalytic CO2-reduction activity with a maximum CO yield reaching 70.8 μmol g(-1) h(-1). The enhanced photocatalytic activity of the composites can be attributed to their high surface area, good dispersion of TiO2 nanoparticles, and effective separation of excited charges due to the synergy of graphene supports and the co-exposure of {001} and {101} facets.
authors: State Key Laboratory of Coal Combustion, Huazhong University of Science & Technology, 1037 Luoyu Road, Wuhan 430074, China. yczhao@hust.edu.cn jyzhang@hust.edu.cn.
authors: Zhuo
authors: Z
authors: Xiong
authors: State Key Laboratory of Coal Combustion, Huazhong University of Science & Technology, 1037 Luoyu Road, Wuhan 430074, China. yczhao@hust.edu.cn jyzhang@hust.edu.cn.
authors: Ying
authors: Y
authors: Luo
authors: State Key Laboratory of Coal Combustion, Huazhong University of Science & Technology, 1037 Luoyu Road, Wuhan 430074, China. yczhao@hust.edu.cn jyzhang@hust.edu.cn.
authors: Yongchun
authors: Y
authors: Zhao
authors: State Key Laboratory of Coal Combustion, Huazhong University of Science & Technology, 1037 Luoyu Road, Wuhan 430074, China. yczhao@hust.edu.cn jyzhang@hust.edu.cn.
authors: Junying
authors: J
authors: Zhang
authors: State Key Laboratory of Coal Combustion, Huazhong University of Science & Technology, 1037 Luoyu Road, Wuhan 430074, China. yczhao@hust.edu.cn jyzhang@hust.edu.cn.
authors: Chuguang
authors: C
authors: Zheng
authors: Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan.
authors: Jeffrey C S
authors: JC
authors: Wu