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, NaNbO /Nb O F 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 H production. Interestingly, the band realignment and good interfacial contact endow the NaNbO /Nb O F heterojunctions with a high HER activity (43.3 mmol g h ), which is about 2.4 times that of pure Nb O F and 1.36 times that of pure NaNbO . The results may provide some new insights into the corrosion technique and HER activity of novel heterostructured catalysts.
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