Journal
CHEMICAL ENGINEERING JOURNAL
Volume 400, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.125931
Keywords
Bi2O2Se; Co-catalyst; TiO2; Photocatalytic hydrogen evolution reaction; DFT
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Funding
- Natural Science Foundation of Jiangsu Province [BK20151248]
- Creative Research Groups of Hubei Province [2014CFA007]
- Large-scale Instrument Equipment Sharing Foundation of Wuhan University, Analytical and Testing Center of Wuhan University
- Hydrogen Energy Innovation Technology Development Program of the National Research Foundation of Korea (NRF-K) - Korean government (Ministry of Science and ICT (MSIT)) [NRF-2019M3E6A1064020]
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To enhance the photocatalytic activity, co-catalysts are often utilized to accelerate rate-limited surface reactions. Herein, various amounts of bismuth oxyselenide (Bi2O2Se) (i.e., 5 to 25 wt%) as a novel co-catalyst were deposited on TiO2 nanoparticles for photocatalytic hydrogen evolution reaction. The 15% Bi2O2Se/TiO2 showed the best enhanced hydrogen production rate of 1240.7 mu mol h(-1)g(-1), which was about 50 times greater than that of pure TiO2. The SEM, EDX-Mapping and TEM revealed the mechanism of in-growth of Bi2O2Se on the TiO2. Trapping experiment of superoxide free radical (O-2(-)) and transient photocurrent decay measurement also revealed that the recombination of the photogenerated electron-hole was remarkably suppressed in Bi2O2Se/TiO2 compared to pure TiO2. Detailed analysis of XPS, transient photocurrent responses, electrochemical impedance spectroscopy (EIS) and DFT calculations indicated that there is a strong interaction between Bi2O2Se and TiO2, and the electrons of TiO2 can be injected into Bi2O2Se. These findings show the potential of Bi2O2Se as cocatalytic materials and open a new avenue for solar water splitting.
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