1. Plasma synthesis of K-doped amorphous carbon nitride with passivated trap states for enhanced photocatalytic H2O2 production.
- Author
-
Xu, Qiang, Zheng, Yanmei, Wang, Shaohua, Fu, Qiuping, Guo, Xinli, Li, Yuying, Ren, Jingxuan, Cao, Zhen, Li, Ruiting, Zhao, Li, and Huang, Ying
- Subjects
- *
AMORPHOUS carbon , *PHOTOCATALYSTS , *NITRIDES , *CONJUGATED systems , *ELECTRONIC structure , *CHARGE carriers , *PLASMA chemistry , *PHOTOCATALYTIC oxidation - Abstract
Amorphous carbon nitride (ACN) is a promising semiconductor photocatalyst for photocatalytic H 2 O 2 production. However, its actual activity is hindered by a high recombination rate of photoexcited charge carriers. Herein we report a K-doped ACN (K-ACN) photocatalyst synthesized via Ar plasma treatment to the modified melamine and KCl powder mixture at a moderate temperature. The as-synthesized K-ACN exhibits significantly enhanced photocatalytic properties for H 2 O 2 production with a yield of 6.21 mM h−1, which is 6 times higher than that of bulk CN. Moreover, the H 2 O 2 yield can be further increased to 13.95 mM h−1 by adjusting the pH value. The significantly enhanced photocatalytic property is mainly attributed to the introduction of K+, which is conducive to tuning the electronic structure, extending π conjugated system, passivating trap states and enhancing photocatalytic activity. The result has provided a facile and effective strategy for the modification of ACN to significantly boost its photocatalytic activity. [Display omitted] • K-ACN photocatalyst was synthesized via Ar plasma treatment to the modified melamine and KCl powder mixture. • The as-synthesized K-ACN exhibits 6-fold photocatalytic H 2 O 2 production relative to pristine carbon nitride. • The passivated trap states were observed in K-ACN and result in faster transport of light-induced active electrons. • K doping is conducive to tuning the electronic structure and enhanceing photocatalytic activity of ACN. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF