Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 266, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2020.118590
Keywords
Carboxyl groups; Electron-withdrawing effects; Charge carrier dynamics; g-C3N4; photocatalytic H-2 evolution
Funding
- National Natural Science Funds for Distinguished Young Scholar [51725201]
- International (Regional) Cooperation and Exchange Projects of the National Natural Science Foundation of China [51920105003]
- Innovation Program of Shanghai Municipal Education Commission [E00014]
- National Natural Science Foundation of China [21573068, 21603073]
- Shanghai Engineering Research Center of Hierarchical Nanomaterials [18DZ2252400]
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Graphitic carbon nitride (g-C3N4) has recently emerged as a promising candidate for photocatalytic hydrogen evolution, but only showed limited activity owing to its sluggish photogenerated carriers separation and migration. Herein, the carboxyl-functionalized g-C3N4 (OCN) was synthesized by a grafting post-treatment method to alleviate the negative influences from this intrinsic drawback. As a result, the surface carboxyl groups greatly improve charge carrier dynamics to suppress carriers recombination via the driving force originated from its electron-withdrawing effects. The resultant O-CN exhibits 52 times higher hydrogen evolution rate than the pristine, and possesses a high apparent quantum yield (AQY) of 15.7 % at 420 +/- 15 nm. This work deepens the understanding of the surface group related modifications for photocatalytic materials, further providing a promising approach for rational design of photocatalysts with highly efficient solar energy conversion.
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