The photocatalytic hydrogen evolution of g–C3N4/K0.5Na0.5NbO3 nanofibers heterojunction under visible light

• Published in: Journal of photochemistry and photobiology. A, Chemistry. Chemistry., 2023-02, Vol.435, p.114192, Article 114192
• Main Authors: Zhang, Tianjin, Chen, Lijiao, Yuan, Changlai, Su, Mingwei, Liu, Xiao, Huang, Shuya, Jiang, Mingfang, Su, Kaiyuan, Wang, Dezhi
• Format: Article
• Language: English
• Subjects: Electrospinning; Heterojunction; Nanofibers; Photocatalysis
• ISSN: 1010-6030; 1873-2666
• DOI: 10.1016/j.jphotochem.2022.114192

[Display omitted] •Nanofibres heterojunction were synthesized by electrospinning and heat-treat.•The rate of the optimum heterojunction is 1.7 times than mechanical mixing.•The negative shift of band edge is the reason for the enhancement of activity. In this paper, g–C3N4/K0.5Na0.5NbO3 nanofibers heterojunction were synthesized via electrospinning and facile heat-treat method. According to XRD, Raman, SEM, TEM and XPS analysis, a heterojunction structure was formed in g–C3N4/K0.5Na0.5NbO3 nanofibers. Electrochemical impedance spectroscopy and transient photocurrent analysis indicated that 20 wt% g–C3N4/K0.5Na0.5NbO3 had the best interfacial charge transfer reaction and high separation efficiency of photogenerated carriers. The rate of photocatalytic hydrogen evolution is 96.3 μmol·g−1·h−1, which is 1.7 times that of simple mechanical mixed powders. This is attributed to the fact that the valence band maximum and conduction band minimum of g–C3N4/K0.5Na0.5NbO3 nanofibers heterojunction are more negative than the mechanical mixed powders, and the difference value between them reaches the maximum when the content of g–C3N4 is 20 wt%.