In Situ Corrosion Fabrication of NaNbO₃/Nb₃O₇F Heterojunctions with Optimized Band Realignment for Enhanced Photocatalytic Hydrogen Evolution

Abstract

Heterostructured photocatalysis is a significant issue owing to the unique band alignment, improved spectrum absorption, and enhanced photocatalytic activity. However, the construction of uniform, controllable, and effective heterojunctions is still a huge challenge. Herein, NaNbO3/Nb3O7F heterojunctions are fabricated through an in situ corrosion technique for the first time. The influence of phase transformation on the hydrogen evolution reaction (HER) activity is investigated systematically in terms of photocatalytic water splitting for H2 production. Interestingly, the band realignment and good interfacial contact endow the NaNbO3/Nb3O7F heterojunctions with a high HER activity (43.3 mmol g−1 h−1), which is about 2.4 times that of pure Nb3O7F and 1.36 times that of pure NaNbO3. The results may provide some new insights into the corrosion technique and HER activity of novel heterostructured catalysts.

In Situ Fabrication of an S-Scheme NaNbO3/Bi2O2CO3 Heterojunction for Enhanced Performance in Photocatalytic Nitrogen Fixation

“…The resulting composite catalyst exhibited a type-II heterojunction structure, enabling efficient migration and separation of charge carriers, ultimately demonstrating exceptional performance in photocatalytic hydrogen production. 28 Xu et al fabricated NaNbO 3 /ZnO photocatalysts through a hydrothermal method. The formed heterostructure effectively suppressed the recombination of charge carriers on the semiconductor surface, greatly promoting and enhancing the photocatalytic activity.…”

“…For instance, Li et al introduced NaNbO 3 nanoparticles on the surface of Nb 3 O 7 F via an etching process. The resulting composite catalyst exhibited a type-II heterojunction structure, enabling efficient migration and separation of charge carriers, ultimately demonstrating exceptional performance in photocatalytic hydrogen production . Xu et al fabricated NaNbO 3 /ZnO photocatalysts through a hydrothermal method.…”