期刊
NANO ENERGY
卷 92, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2021.106702
关键词
BaTiO3@TiO2 nanowires; Synergistic principle; Piezo-photocatalysis; Dye degradation
类别
资金
- National Key Research & Development Program of China [2020YFA0711700]
- National Natural Science Foundation of China [52002404, U19A2087]
- Hunan Province Natural Science Foundation [2019JJ40349]
- State Key Laboratory of Powder Metallurgy, Central South University, Changsha, China
By synthesizing core-shell structured BaTiO3@TiO2 nanowires heterojunctions, this study achieved superior piezo-photocatalytic degradation performance and revealed the coupling mechanisms through photoelectrochemical measurements and band diagram analysis. The enhanced carrier concentration and improved charge lifetime due to the construction of a heterojunction between TiO2 and BT led to outstanding degradation of highly concentrated dyes.
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 10(5) min and 99.7% in 45 min, respectively, which are much higher than piezo-photocatalysis systems reported before. To reveal the coupling mechanisms, photoelectrochemical measure-ments and band diagram analysis were carried out. The carrier concentration was increased from 2.28 x 10(17) cm(-3) to 4.91 x 10(18) 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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据