Facile
| Autor: | Weisong, Li, Zheng, Guo, Litong, Jiang, Lei, Zhong, Guoning, Li, Jiajun, Zhang, Kai, Fan, Sergio, Gonzalez-Cortes, Kuijuan, Jin, Chunjian, Xu, Tiancun, Xiao, Peter P, Edwards |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Chemical Science |
| ISSN: | 2041-6520 |
| Popis: | A new strategy is reported here to synthesize both nitrogen deficient and protonated graphitic carbon nitride (g-C3N4) nanosheets by the conjoint use of NH4Cl as a dynamic gas template together with hypophosphorous acid (H3PO2) as a doping agent. The NH4Cl treatment allows for the scalable production of protonated g-C3N4 nanosheets. With the corresponding co-addition of H3PO2, nitrogen vacancies, accompanied by both additional protons and interstitially-doped phosphorus, are introduced into the g-C3N4 framework, and the electronic bandgap of g-C3N4 nanosheets as well as their optical properties and hydrogen-production performance can be precisely tuned by careful adjustment of the H3PO2 treatment. This conjoint approach thereby results in improved visible-light absorption, enhanced charge-carrier separation and a high H2 evolution rate of 881.7 μmol h−1 achieved over the H3PO2 doped g-C3N4 nanosheets with a corresponding apparent quantum yield (AQY) of 40.4% (at 420 nm). We illustrate that the synergistic H3PO2 doping modifies the layered g-C3N4 materials by introducing nitrogen vacancies as well as protonating them, leading to significant photocatalytic H2 evolution enhancements, while the g-C3N4 materials doped with phosphoric acid (H3PO4) are simply protonated further, revealing the varied doping effects of phosphorus having different (but accessible) valence states. Nitrogen deficient and protonated g-C3N4 was fabricated by the conjoint protocol utilizing NH4Cl as gas template and H3PO2 as doping agent, leading to enhanced visible-light harvesting and charge carrier separation to achieve efficient H2 evolution. |
| Databáze: | OpenAIRE |
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