Doping effect of metalloid group in graphitic carbon nitride molecular structure for significantly improved photocatalytic hydrogen production and photoelectric performance

Jiacong Wu, Chunmei Li, Hongjun Dong, Haibo Zhang, Juan Han, Lei Wang, Siyu Yu and Yun Wang

Renewable Energy, 2020, vol. 157, issue C, 660-669

Abstract: It is a considerable research focus to introduce a new conjugate structure into the graphitic carbon nitride (g-C3N4) molecule by polymerization to improve the photocatalytic and photoelectrochemical performance. Herein, the 1,4-cyclohexadiene (CHD) group-doped g-C3N4 (CHD-g-C3N4) nanosheet photocatalyst is prepared by a simple thermal polymerization, which dramatically improves the photocatalytic H2 production and photoelectrochemical performance. Surprisingly, the optimal H2 production rate and the photocurrent density of CHD-g-C3N4 reaches up to 522.0 μmol h−1 g−1 and 31.19 μA cm−2, which is 6.29 and 6.96 times higher than that of pure g-C3N4, respectively. The high-efficiency and stable photocatalytic H2 production and photoelectrochemical performance of CHD-g-C3N4 originate from the doping effect of conjugated groups in g-C3N4 molecule, which extends the π-conjugated system to accelerate electron mobility. This work indicates that the introduction of metalloid groups with conjugation effect is of great significance for improving photocatalytic and photoelectric performance, and provides a new idea for the non-metallic modification of g-C3N4 as a highly active catalyst.

Keywords: Hydrogen production; Conjugated effect; g-C3N4; p-benzoquinone; Photoelectrochemical performance (search for similar items in EconPapers)
Date: 2020
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:157:y:2020:i:c:p:660-669

DOI: 10.1016/j.renene.2020.04.086

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