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Title: Regulating directional transfer of electrons on polymeric g-C₃N₅ for highly efficient photocatalytic H₂O₂ production
Authors: Che, Huinan
Wang, Jian
Gao, Xin
Chen, Juan
Wang, Peifang
Liu, Bin
Ao, Yanhui
Keywords: Engineering::Chemical engineering
Issue Date: 2022
Source: Che, H., Wang, J., Gao, X., Chen, J., Wang, P., Liu, B. & Ao, Y. (2022). Regulating directional transfer of electrons on polymeric g-C₃N₅ for highly efficient photocatalytic H₂O₂ production. Journal of Colloid and Interface Science, 627, 739-748.
Project: RG4/20 
Journal: Journal of Colloid and Interface Science
Abstract: Graphite carbon nitride (g-C3N5) has been widely used in various photocatalytic reactions due to its higher thermodynamic stability and better electronic properties compared to g-C3N4. However, it is still challenging to endow g-C3N5 with high performance on photocatalytic hydrogen peroxide (H2O2) production. Herein, potassium and iodine are co-doped into g-C3N5 (g-C3N5-K, I) for photocatalytic production of H2O2 with high efficiency. As expected, the photocatalytic H2O2 production rate over the g-C3N5-K, I (2933.4 μM h-1) reaches to 84.22 times as that of g-C3N5. The excellent photocatalytic H2O2 production activity is mainly ascribed to the co-doping of K and I, which significantly improves the capacity of oxygen (O2) adsorption, selectivity of two-electrons oxygen reduction reaction (2e- ORR) and separation efficiency of charge carriers. The density functional theory (DFT) calculations reveal that O2 molecules are more conducive to being adsorbed on g-C3N5-K, I. Besides, the result of excited states further indicates that photo-generated electrons can be directionally driven to the adsorbed O2 molecules, which are effectively activated to form H2O2. The findings will contribute to new insights in designing and synthesizing g-C3N5 based photocatalysts for the H2O2 production.
ISSN: 0021-9797
DOI: 10.1016/j.jcis.2022.07.080
Schools: School of Chemical and Biomedical Engineering 
School of Physical and Mathematical Sciences 
Rights: © 2022 Elsevier Inc. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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