Journal
APPLIED SURFACE SCIENCE
Volume 440, Issue -, Pages 258-265Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2018.01.091
Keywords
g-C3N4; Photocatalytic hydrogen evolution; K-doped; pi-conjugated system
Categories
Funding
- National Natural Science Foundation of China [21676056, 21376051, 51673040]
- Six Talents Pinnacle Program of Jiangsu Province of China [JNHB-006]
- Qing Lan Project of Jiangsu Province [1107040167]
- Graduate Student Scientific Research Innovation Program of Jiangsu Province [KYCX17_0134, KYCX17_0136]
- Scientific Research Foundation of Graduate School of Southeast University [YBJJ1731, YBJJ1732, YBJJ1733]
- Fund Project for Transformation of Scientific and Technological Achievements of Jiangsu Province of China [BA2014100]
- Fundamental Research Funds for the Central Universities [2242015k30001, 3207047402, 3207046409]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) [1107047002]
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Graphite carbon nitride (g-C3N4), as a promising low cost, visible light driven conjugated polymer semiconductor photocatalyst, has attracted wide attentions from researchers. However, low light absorption efficiency and inadequate charge separation limit the potential applications of g-C3N4. This paper exhibits K-doped g-C3N4 prepared by a facile thermal polymerization with KBr as the K source. The experiments of photocatalytic hydrogen evolution demonstrate that KBr content strongly affects the activity of the catalyst. XRD, FT-IR, XPS, SEM, TEM, UV-vis diffuse reflectance spectra, photoluminescence (PL) characterization methods are used to study the effects of potassium on the catalyst performance. The results find that K-modified g-C3N4 has a narrower band gap and enhanced light harvesting properties. Moreover, the photocatalytic hydrogen evolution rate (HER) of the optimized K-doped g-C3N4 nanosheets (10 wt % KBr) reaches 1337.2 mu mol g(-1)h(-1), which is about 5.6 times in comparison with that of pure g-C3N4 (239.8 mu mol g(-1)h(-1)). The doping of the potassium may increase the pi-conjugated systems and accelerate the electron transport rate, then improve the photocatalytic properties. Based on the results of the analysis, a possible mechanism is proposed. (C) 2018 Elsevier B.V. All rights reserved.
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