Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 7, Issue 35, Pages 20223-20228Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ta05135j
Keywords
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Funding
- National Natural Science Foundation of China [51872003, 51572003]
- Anhui Provincial Natural Science Foundation [1908085J21, 1908085QB83]
- Research Start-up Fund of Anhui University [S020118002/011, Y040433002]
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Graphitic carbon nitride (g-C3N4) with pronounced excitation of lone pairs benefits from extended visible light absorption, which thus enhances its photocatalytic hydrogen (H-2) generation activity. However, achieving such lone pair excitation in g-C3N4 remains a grand challenge. Here we report on the synthesis of g-C3N4 with remarkable lone pair excitation through thermolysis of protonated melamine via a facile microwave-assisted heating. The g-C3N4 photocatalyst after optimizing the proton concentration offers a highest H-2 generation rate of 21.4 mmol h(-1), which is nearly 7 times higher than that of g-C3N4 created from unprotonated melamine under identical conditions (3.2 mmol h(-1)). Furthermore, active H-2 generation at 490 nm light irradiation (2.3 mmol h(-1)) is realized owing to the lone pair excitation. This work shows the great potential of protonation combined with microwave-assisted heating for activating the lone pair excitation in g-C3N4 for increased photocatalytic performance.
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