期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 44, 期 14, 页码 7194-7204出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2019.01.274
关键词
2D materials; g-C3N4 nanosheets; One-step synthesis; Template-free polymerization; Photocatalysis; Solar energy conversion
资金
- Youth Talent Lifting Project of Jilin Province [181907]
- Project of State Forestry Administration of China [201504502]
- Major Science and Technology Tender Special of Jilin Province [20170203001SF]
Two-dimensional (2D) graphitic carbon nitride (g-C3N4) nanosheets, as the promising photocatalyst with fascinating properties, have become a rising star in the field of photocatalysis. Although g-C3N4 nanosheets exfoliated from the bulk g-C3N4 powders are extensively emerged, developing a simple synthetic approach is still full of challenge. To this end, here we report a direct polymerization strategy to fabricate the ultrathin g-C3N4 nanosheets, that is only heating treatment of thiourea in air without addition of any template. The photocatalytic activities of as-prepared samples were evaluated by photoreduction of water to hydrogen (H-2) using triethanolamine as sacrificial agent and Pt as co-catalyst under visible-light irradiation (lambda > 420 nm). As a result, our few-layered g-C3N4 nanosheets with an average thickness of 3.5 nm exhibit a superior visible-light photocatalytic H-2 evolution rate (HER) of 1391 mu mol g(-1) h(-1) and a remarkable apparent quantum efficiency of 6.6% at 420 nm. Eventually, the HER of as-fabricated ultrathin g-C3N4 nanosheets is not only much higher than the dicyandiamide-derived g-C3N4 or melamine-derived g-C3N4, but also greater than the thermal-oxidation etched g-C3N4 nanosheets under the same condition. (C) 2019 Published by Elsevier Ltd on behalf of Hydrogen Energy Publications LLC.
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