Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 232, Issue -, Pages 306-313Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2018.03.072
Keywords
Graphitic carbon nitrides; Highly crystalline; High-yield synthesis; Hydrogen bonds; Hydrogen evolution
Funding
- National Natural Science Foundation of China [21773062, 21577036, 5171101651, 21677048]
- State Key Research Development Program of China [2016YFA0204200]
- Chenguang Program from Shanghai Education Development Foundation [14CG30]
- Shanghai Municipal Education Commission [14CG30]
- Science and Technology Commission of Shanghai Municipality [16JC1401400, 17520711500]
- Shanghai Pujiang Program [17PJD011]
- Fundamental Research Funds for the Central Universities [22A201514021]
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Highly crystalline graphitic carbon nitride (g-C3N4) possesses the high separation efficiency of photogenerated electron-hole pairs owing to the significantly decreased intralayer hydrogen bonds, which leads to drastic improvement of photocatalytic activity. However, the preparation of such g-C3N4 material remains a challenge by a simple and economic thermal-treatment in a furnace. Herein, we report a novel and effective strategy for high yield synthesis of extremely active crystalline carbon nitride nanosheets (CCNNSs) by two-step calcination without the assistance of any additive or salt intercalation. As expected, the as-prepared CCNNSs exhibit a remarkably high hydrogen evolution rate of 9577.6 pmol h(-1) g(-1) under simulated solar light irradiation, which is 15.5 times than that of bulk g-C3N4, as well as higher than most of the reported crystalline g-C3N4. Moreover, a highly apparent quantum efficiency of 9.01% at 420 nm for hydrogen evolution can be achieved, which is also superior to the reported crystalline g-C3N4. Such two-step calcination approach not only provides an economical way to effectively regulate the crystallinity of bulk g-C3N4, but also achieves the preparation of CCNNSs with high yield. Our research opens up a new window to self-modification and fabrication of highly active metal-free photocatalysts for solar light-driven hydrogen production.
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