Regulating directional transfer of electrons on polymeric g-C₃N₅ for highly efficient photocatalytic H₂O₂ production
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) p...
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sg-ntu-dr.10356-1639322023-12-12T02:19:58Z Regulating directional transfer of electrons on polymeric g-C₃N₅ for highly efficient photocatalytic H₂O₂ production Che, Huinan Wang, Jian Gao, Xin Chen, Juan Wang, Peifang Liu, Bin Ao, Yanhui School of Chemical and Biomedical Engineering School of Physical and Mathematical Sciences Engineering::Chemical engineering g-C3N5 Oxygen Reduction Reaction 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. Agency for Science, Technology and Research (A*STAR) Ministry of Education (MOE) We are grateful for the grants from Natural Science Foundation of China (No. 51979081 and No. 52100179), Fundamental Research Funds for the Central Universities (No. B210202052), China Postdoctoral Science Foundation (No. 2020M680063 and No. 2021T140176), Ministry of Education of Singapore (Tier 1: RG4/ 20 and Tier 2: MOET2EP10120-0002), Agency for Science, Technology and Research (AME IRG: A20E5c0080) and PAPD. 2022-12-22T05:40:56Z 2022-12-22T05:40:56Z 2022 Journal Article 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. https://dx.doi.org/10.1016/j.jcis.2022.07.080 0021-9797 https://hdl.handle.net/10356/163932 10.1016/j.jcis.2022.07.080 35878464 2-s2.0-85134599801 627 739 748 en RG4/20 MOET2EP10120-0002 A20E5c0080 Journal of Colloid and Interface Science © 2022 Elsevier Inc. All rights reserved. |
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Engineering::Chemical engineering g-C3N5 Oxygen Reduction Reaction Che, Huinan Wang, Jian Gao, Xin Chen, Juan Wang, Peifang Liu, Bin Ao, Yanhui Regulating directional transfer of electrons on polymeric g-C₃N₅ for highly efficient photocatalytic H₂O₂ production |
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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. |
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School of Chemical and Biomedical Engineering |
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School of Chemical and Biomedical Engineering Che, Huinan Wang, Jian Gao, Xin Chen, Juan Wang, Peifang Liu, Bin Ao, Yanhui |
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Article |
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Che, Huinan Wang, Jian Gao, Xin Chen, Juan Wang, Peifang Liu, Bin Ao, Yanhui |
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Che, Huinan |
title |
Regulating directional transfer of electrons on polymeric g-C₃N₅ for highly efficient photocatalytic H₂O₂ production |
title_short |
Regulating directional transfer of electrons on polymeric g-C₃N₅ for highly efficient photocatalytic H₂O₂ production |
title_full |
Regulating directional transfer of electrons on polymeric g-C₃N₅ for highly efficient photocatalytic H₂O₂ production |
title_fullStr |
Regulating directional transfer of electrons on polymeric g-C₃N₅ for highly efficient photocatalytic H₂O₂ production |
title_full_unstemmed |
Regulating directional transfer of electrons on polymeric g-C₃N₅ for highly efficient photocatalytic H₂O₂ production |
title_sort |
regulating directional transfer of electrons on polymeric g-c₃n₅ for highly efficient photocatalytic h₂o₂ production |
publishDate |
2022 |
url |
https://hdl.handle.net/10356/163932 |
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1787136648775991296 |