Abstract
The induced built-in electric field by piezoelectric materials has proven to be one of the most effective strategies for modulating the charge-transfer pathway and inhibiting carrier recombination. In this work, a series of core-shell structured BaTiO3@TiO2 nanowires (BT@TiO2 NWs) heterojunctions were synthesized and the significant coupling effects between BaTiO3 (BT) and TiO2 resulted in surperior piezo-photocatalytic performance, which was demonstrated by three typical types of dyes with high concentrations. The degradation efficiency of 30 mg/L Rhodamine B (RhB), Methylene blue (MB) and Indigo Carmine (IC) solutions by 0.5 g/L BT@TiO2 NWs reached 99.5% in 75 min, 99.8% in 105 min and 99.7% in 45 min, respectively, which are much higher than piezo-photocatalysis systems reported before. To reveal the coupling mechanisms, photoelectrochemical measurements and band diagram analysis were carried out. The carrier concentration was increased from 2.28 × 1017 cm−3 to 4.91 × 1018 cm−3 and the lifetime of charges was improved from 50.37 ms to 60.98 ms due to the construction of a heterojunction between TiO2 and BT. It was proposed that the tilting and bending of the energy band caused by the introduction of a piezoelectric polarization can facilitate carrier separation both in the bulk phase and at the surfaces of semiconductors, resulting in outstanding piezo-photocatalytic properties for highly concentrated dye degradation. This work provides a universal catalyzer for highly concentrated dye degradation.
Original language | English |
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Article number | 106702 |
Journal | Nano Energy |
Volume | 92 |
Early online date | 11 Nov 2021 |
DOIs | |
Publication status | Published - 28 Feb 2022 |
Funding
This work was financially supported by National Key Research & Development Program of China (No. 2020YFA0711700 ), the National Natural Science Foundation of China ( 52002404 , U19A2087 ), Hunan Province Natural Science Foundation ( 2019JJ40349 ), and the State Key Laboratory of Powder Metallurgy, Central South University , Changsha, China.
Keywords
- BaTiO@TiO nanowires
- Dye degradation
- Piezo-photocatalysis
- Synergistic principle
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- General Materials Science
- Electrical and Electronic Engineering