Self-assembled Ag4V2O7/Ag3VO4 Z-scheme heterojunction by pH adjustment with efficient photocatalytic performance

作者：Yan Xing, Xichuan Lu, Yi Li, Bozhi Yang, Yujia Huang, Mengfei Zhang, Jing Cheng, Xin Min, Wei Pan · 发表于：Journal of Advanced Ceramics · 年份：2022 · DOI：10.1007/s40145-022-0648-5 · 被引用次数：45 · 研究领域：Advanced Photocatalysis Techniques、Advanced Nanomaterials in Catalysis、Copper-based nanomaterials and applications

Abstract Semiconductor heterojunction plays a pivotal role in photocatalysis. However, the construction of a heterojunction with a fine microstructure usually requires complex synthetic procedures. Herein, a pH-adjusted one-step method was employed to controllably synthesize Ag 4 V 2 O 7 /Ag 3 VO 4 heterojunction with a well-tuned 0D/1D hierarchical structure for the first time. It is noteworthy that the ordered stacking of vanadium oxide tetrahedron $$(\rm{VO}_3^-)$$ ( V O 3 − ) guided by the pH value wisely realizes the in-situ growth of Ag 4 V 2 O 7 nanoparticles on the surface of Ag 3 VO 4 nanorods. Furthermore, comprehensive characterization and calculation decipher the electronic structures of Ag 4 V 2 O 7 and Ag 3 VO 4 and the formation of Z-scheme heterojunction, benefiting the visible light harvesting and carrier utilization. Such a new Ag 4 V 2 O 7 /Ag 3 VO 4 heterojunction exhibits remarkable photocatalytic activity and excellent stability. Complete degradation of Rhodamine B (RhB) can be achieved in 10 min by the Ag 4 V 2 O 7 /Ag 3 VO 4 heterojunction under visible light irradiation, demonstrating an outstanding reaction rate of 0.35 min −1 that is up to 84-fold higher than those of other silver vanadates. More importantly, this integration of synthesis technology and heterojunction design, based on the intrinsic crystal and electronic structures, could be inspiring for developing novel heterostructured materials with advanced performance.