Conversion of Z-Scheme to type-II in dual-defective V2O5/C3N4 heterostructure for durable hydrogen evolution
Next Materials(2024)
Abstract
The carbon nitride (C3N4) materials and hybrids have been acknowledged as promising photocatalysts for decades. The precise design and modulation of C3N4-based photocatalyst in defects and energy bands for further promotion is of importance but less investigated. In this work, a type of defective V2O5/C3N4 heterojunction with dual oxygen and carbon vacancy on interface is designed through simple annealing and plasma etching. The incorporation of V2O5 enables to promote the separation efficiency for photo-induced carriers and enhance built-in electric field (BIEF) at junction boundary to accelerate charge transport. The designed double defects in V2O5/C3N4 further results in a type-II heterojunction and switch of redox reaction sites, preventing photocatalytic corrosion of unstable V2O5. As a result, owing to the integrated advantages of such composite photocatalyst, the defective V2O5/C3N4 heterojunction exhibits a comparable hydrogen evolution rate of 0.90 mmol·g−1·h−1 to V2O5/C3N4, and dramatically improved regeneration with a continuous hydrogen evolution rate of 0.83 mmol·g−1·h−1 for 5 cycles. Our study is envisaged to provide a toolbox for rationally designing compositive nanomaterials toward high-efficiency photocatalytic systems.
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Key words
Photocatalysis,Hydrogen evolution,Heterojunction,Carbon nitride,V2O5
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