Citation: Lina Kong, Xintong Zhang, Changhua Wang, Fangxu Wan, Lan Li. Synergic effects of Cu_xO electron transfer co-catalyst and valence band edge control over TiO₂ for efficient visible-light photocatalysis[J]. Chinese Journal of Catalysis, ;2017, 38(12): 2120-2131. doi: 10.1016/S1872-2067(17)62959-0 shu

Synergic effects of Cu_xO electron transfer co-catalyst and valence band edge control over TiO₂ for efficient visible-light photocatalysis

a Institute of Material Physics, Key Laboratory for Optoelectronic Materials and Devices of Tianjin, Key Laboratory of Display Materials and Photoelectric Devices of Ministry of Education, College of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300191, China;
b Center for Advanced Optoelectronic Functional Materials Research, and Key Laboratory of UV-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, Changchun 130024, Jilin, China

Received Date: 10 October 2017
Revised Date: 31 October 2017

Fund Project: This work was supported by the National Natural Science Foundation of China (51072032, 51372036, 51702235).

Bandgap engineering by doping and co-catalyst loading are two primary approaches to designing efficient photocatalysts by promoting visible-light absorption and charge separation, respectively. Shifting of the TiO₂ conduction band edge is frequently applied to increase visible-light absorption but also lowers the reductive properties of photo-excited electrons. Herein, we report a visible-light-driven photocatalyst based on valance band edge control induced by oxygen excess defects and modification with a Cu_xO electron transfer co-catalyst. The Cu_xO grafted oxygen-rich TiO₂ microspheres were prepared by ultrasonic spray pyrolysis of the peroxotitanate precursor followed by a wet chemical impregnated treatment. We found that oxygen excess defects in TiO₂ shifted the valence band maximum upward and improved the visible-light absorption. The Cu_xO grafted onto the surface acted as a co-catalyst that efficiently reduced oxygen molecules to active intermediates (i.e., O₂^·-radial and H₂O₂), thus consuming the photo-generated electrons. Consequently, the Cu_xO grafted oxygen-rich TiO₂ microspheres achieved a photocatalytic activity respectively 8.6, 13.0 and 11.0 as times high as those of oxygen-rich TiO₂, normal TiO₂ and Cu_xO grafted TiO₂, for degradation of gaseous acetaldehyde under visible-light irradiation. Our results suggest that high visible-light photocatalytic efficiency can be achieved by combining oxygen excess defects to improve visible-light absorption together with a Cu_xO electron transfer co-catalyst. These findings provide a new approach to developing efficient heterojunction photocatalysts.
- Visible light photocatalysis,
- TiO₂,
- Cu_xO cocatalyst,
- Oxygen-excess defect,
- Porous microsphere
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Synergic effects of CuxO electron transfer co-catalyst and valence band edge control over TiO2 for efficient visible-light photocatalysis

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通讯作者: 陈斌, bchen63@163.com

Synergic effects of Cu_xO electron transfer co-catalyst and valence band edge control over TiO₂ for efficient visible-light photocatalysis