Citation: Yanxi Gong, Jianbing Wang, Zikun Cheng, Zhiyuan Han, Xu Zhao, Buyu Chai, Yuanchun Han. Developing high-quality g-C₃N₄ film electrode for the photoelectrocatalytic degradation of methylene blue in water[J]. Chinese Chemical Letters, ;2023, 34(3): 107535. doi: 10.1016/j.cclet.2022.05.049 shu

Developing high-quality g-C₃N₄ film electrode for the photoelectrocatalytic degradation of methylene blue in water

Yanxi Gong ^a ,
Jianbing Wang ^{a, *,} ,
Zikun Cheng ^a ,
Zhiyuan Han ^a ,
Xu Zhao ^b ,
Buyu Chai ^a ,
Yuanchun Han ^a

a.
China University of Mining and Technology-Beijing, Beijing 100083, China
b.
Research Center for Eco-Environment Sciences, Chinese Academy of Sciences, Beijing 100085, China

wangjb@cumtb.edu.cn

Received Date: 17 December 2021
Revised Date: 25 March 2022
Accepted Date: 14 May 2022
Available Online: 19 May 2022

Figures(4)

Developing a high-quality photoelectrode for photoelectrochemical applications is still an ongoing challenge. In this study, we prepared the g-C₃N₄ film on the indium tin oxide (ITO) glass through conventional coating, liquid-based growth, in-situ calcination, and vapor deposition methods, respectively. These electrodes were characterized and used as photoanodes to degrade methylene blue (MB) in water. Among these methods, the in-situ calcination method was most appropriate for preparing the continuous and organized g-C₃N₄ film electrodes with uniform g-C₃N₄ coverage and strong adhesion to the ITO substrate. It also had the highest activity in the photocatalytic (PC), electrochemical (EC), and photoelectrocatalytic (PEC) degradation processes of MB. In the PEC reaction, at an applied potential of 1.0 V and a light intensity of 0.96 W/cm², the removal rate of MB was 62.5%, which was much higher than those in the PC and EC reactions. The high degradation rate was due to the synergistic effect of PEC degradation, wherein the PC and EC reactions promote and optimize each other. In the PC reaction, MB was degraded by −CH₃ elimination, while the EC degradation pathway mainly included the conversion of sulfhydryl into sulfoxide and the opening of the central aromatic ring. Both methyl loss and aromatic ring opening occurred in the PEC reaction. Moreover, some monocyclic compounds were formed, and MB showed more complete degradation in the PEC reaction.
- Graphitic carbon nitride,
- Photoelectrochemical activity,
- Methylene blue,
- Degradation pathway,
- Synergistic effect
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Developing high-quality g-C3N4 film electrode for the photoelectrocatalytic degradation of methylene blue in water

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通讯作者: 陈斌, bchen63@163.com

Developing high-quality g-C₃N₄ film electrode for the photoelectrocatalytic degradation of methylene blue in water