Citation: Qi-Feng Liu, Qian Zhang, Bing-Rui Liu, Shiyou Li, Jing-Jun Ma. Building surface defects by doping with transition metal on ultrafine TiO₂ to enhance the photocatalytic H₂ production activity[J]. Chinese Journal of Catalysis, ;2018, 39(3): 542-548. doi: 10.1016/S1872-2067(18)63044-X shu

Building surface defects by doping with transition metal on ultrafine TiO₂ to enhance the photocatalytic H₂ production activity

a College of Science and Technology, Agricultural University of Hebei, Huanghua 061100, Hebei, China;
b Hunan Provincial Key Laboratory of Pollution Control and Resources Technology, University of South China, Hengyang 421001, Hunan, China;
c Hebei Agricultural Products Processing Engineering Technology Research Center, Baoding 071001, Hebei, China

Received Date: 23 January 2018
Revised Date: 5 February 2018

Fund Project: This work was supported by the Double First-rate Subject-Food Science and Engineering Program of Hebei Province (2018SPGCA18), Young Tip-top Talents Plan of Universities and Colleges in Hebei Province of China (BJ2017026), and the Specific Foundation for Doctor in Hebei Agriculture University of China (ZD201709).

Inefficient charge separation and limited light absorption are two critical issues associated with high-efficiency photocatalytic H₂ production using TiO₂. Surface defects within a certain concentration range in photocatalyst materials are beneficial for photocatalytic activity. In this study, surface defects (oxygen vacancies and metal cation replacement defects) were induced with a facile and effective approach by surface doping with low-cost transition metals (Co, Ni, Cu, and Mn) on ultrafine TiO₂. The obtained surface-defective TiO₂ exhibited a 3-4-fold improved activity compared to that of the original ultrafine TiO_2. In addition, a H₂ production rate of 3.4 μmol/h was obtained using visible light (λ > 420 nm) irradiation. The apparent quantum yield (AQY) at 365 nm reached 36.9% over TiO₂-Cu, significantly more than the commercial P25 TiO₂. The enhancement of photocatalytic H₂ production activity can be attributed to improved rapid charge separation efficiency and expanded light absorption window. This hydrothermal treatment with transition metal was proven to be a very facile and effective method for obtaining surface defects.
- Construction of surface defects,
- Ultrafine TiO₂,
- Low-cost transition metal,
- Surface doping,
- Photocatalytic H₂ production
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Building surface defects by doping with transition metal on ultrafine TiO2 to enhance the photocatalytic H2 production activity

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Building surface defects by doping with transition metal on ultrafine TiO₂ to enhance the photocatalytic H₂ production activity