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Enhanced Photocatalysis by Synergistic Piezotronic Effect and Exciton–Plasmon Interaction Based on (Ag‐Ag 2 S)/BaTiO 3 Heterostructures
Author(s) -
Lei Yanqiang,
Xu Shuya,
Ding Mei,
Li Linlin,
Sun Qijun,
Wang Zhong Lin
Publication year - 2020
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202005716
Subject(s) - materials science , plasmon , photocatalysis , heterojunction , exciton , surface plasmon resonance , methyl orange , optoelectronics , semiconductor , barium titanate , electronic band structure , nanotechnology , nanoparticle , dielectric , condensed matter physics , catalysis , biochemistry , chemistry , physics
Piezotronic and plasmonic effects are effective strategies to improve photocatalytic performance. Combining these two effects in one photocatalytic heterostructure is intriguing, but has yet to be reported. Here, a hybrid ternary structure ((silver‐silver sulfide)/barium titanate (Ag‐Ag 2 S)/BaTiO 3 ) is introduced, where the synergistic exciton–plasmon interaction in Ag‐Ag 2 S and Ag 2 S/BaTiO 3 heterojunction tuned by piezoelectric polarization can enhance the photon absorption and charge carrier separation to promote photocatalysis efficiency. The exciton–plasmon interaction in Ag‐Ag 2 S can amplify the plasmon resonance to the semiconductor region and enhance the light absorption of Ag 2 S. The piezoelectric polarization can tune the band structure of BaTiO 3 and then change the heterojunction between Ag 2 S/BaTiO 3 from Type I (i.e., straddling energy band alignments between BaTiO 3 and Ag 2 S) to Type II (i.e., Z‐scheme system between BaTiO 3 and Ag 2 S with a staggered energy band alignment), which can accelerate the separation of electron‐hole pairs. Using this hybrid material, a high methyl orange (MO) degradation rate up to 90% within 30 min is obtained, which is 20% higher than that of Ag/BaTiO 3 . The demonstrated hybrid material based on the synergistic piezotronic effect and exciton–plasmon interaction shows great promise in pollutant treatment with high efficiency.