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

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 mu mol.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%.

Automated summary

g-C3N4/K0.5Na0.5NbO3 nanofibers heterojunctions were synthesized through electrospinning and facile heat-treat method, showing excellent performance in photocatalytic hydrogen evolution. Analysis revealed that 20 wt% g-C3N4/K0.5Na0.5NbO3 exhibited the best interfacial charge transfer and carrier separation efficiency.