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Phosphorus- and fluorine-co-doped carbon nitride: modulated visible light absorption, charge carrier kinetics and
Pinnan Li1, Mingya Wang1, Shushu Huang1,2
1Inner Mongolia Key Laboratory of Chemistry and Physics of Rare Earth Materials, College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot, 010021, China. cesyg@imu.edu.cn.
Abstract:
A phosphorus and fluorine co-doped carbon nitride (PF-CN) photocatalyst was synthesized to modulate the band gap structure, visible light response ability and photocatalytic H2 evolution activity. Experimental results demonstrated that the electronic structure of g-C3N4 was regulated by phosphorus replacing the C site and fluorine substituting the N site in the g-C3N4 framework to form P-N species and C-F bonds, respectively. P- and F-co-doped carbon nitride gave rise to a more negative conduction band potential, larger surface area, efficient separation of photogenerated charge carriers and a faster charge transfer rate, contributing to an enhancement of photocatalytic H2 production activity. PF-CN achieved an optimal H2 evolution activity of 1690.56 μmol g-1 which was 17.83 times higher with respect to that of pristine g-C3N4 (94.81 μmol g-1). Meanwhile, PF-CN achieved the highest apparent quantum efficiency of 3.76% at 435 nm.
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