Materials Today Energy
·
2021
·
IF 7.311
J. Wu,N. Qin,E.Z. Lin,Z.H. Kang,D.H. Bao
Nanocrystalline Ba 1- x Sr x TiO 3 ( x = 0–0.3) powders were investigated with special interest in their piezocatalytic performance for degradation of organic pollutants. A great improvement of piezocatalytic activity was obtained for the compositions x = 0.2, in which the polarization shows a large change under external stress. Furthermore, with the increase of working environment temperature, the piezocatalytic performance of Ba 0.8 Sr 0.2 TiO 3 increases firstly and then decreases, giving the best piezocatalytic performance near its Curie temperature . For a better understanding of the piezocatalytic mechanism, the dynamics of charge carriers transfer on solid/liquid interface was discussed with respect to activation energy and overpotential of catalyst. It was suggested that the enhanced piezocatalytic activity of Ba 1- x Sr x TiO 3 comes from two aspects: (1) the overpotential provided by the piezoelectric effect decreases with the increasing Sr content, (2) the activation energy for the piezocatalytic reaction is greatly reduced at ferro-paraelectric phase transition. Combination of these two aspects gives rise to the nonlinear dependence of piezocatalytic activity on Sr content.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Wanwan Cheng,Xiaoli Xu,Huan Zhai,Ying Wang,Lingbo Xiao,Laishun Qin,Hamideh Khanbareh,Chris Bowen,Yanmin Jia,Da Chen
Piezocatalysis is an innovative, clean catalytic technology. The efficiency requires enhancement due to the low level of piezoelectricity, low carrier concentration, and rapid recombination rates of the materials. Composition modulation is a critical strategy for enhancing the piezoelectric activity of ferroelectric materials. In this work, the influence of composition changes on the piezocatalytic performance of barium strontium titanate (Ba 1- x Sr x TiO 3 (0 ≤ x ≤ 0.3)) with varying Ba/Sr molar ratios is investigated. As the Sr content ( x ) increases from x = 0 to x = 0.3, the effective piezoelectric coefficient exhibits a significant enhancement from d eff = 46.8 pm·V −1 to d eff = 205.6 pm·V −1 , leading to an increase in the carrier concentration increase ( ΔN d ), due to the application of vibrations from ΔN d = 0.11 × 10 20 cm −3 (for x = 0) to ΔN d = 1.69 × 10 20 cm −3 (for x = 0.3). The optimal hydrogen production for each composition occurs near, but not exceeding, its Curie point ( T C） . The optimized piezocatalytic hydrogen production (per unit power) of Ba 0.7 Sr 0.3 TiO 3 at room temperature is 53.4 µmol·g −1 ·h −1 ·W −1 , which is one of the highest reported values to date. This work investigates the fundamental reasons behind composition modulation of piezocatalysis, providing constructive guidance for designing optimized piezocatalysts.
研究领域:
材料科学
·
催化
·
铁电材料
·
能量转换
·
纳米技术
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产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2026
·Vol. 156
·期 4
·108
·
IF 2.5
Xu Tingting,Yang Xiaofeng,Chen Jin,Ma Yuzhao,Li Yanjun
Tetracycline persists extensively in aquatic environments due to its refractory nature, posing a significant threat to ecosystem integrity and human health. However, the practical application of pure BaTiO 3 is limited by low carrier mobility and insufficient active sites. Herein, we synthesized rod-shaped Ba 1−x Sr x TiO 3 /Co 3 O 4 (x = 0.1–0.5) heterojunction catalysts to investigate their degradation performance of tetracycline (TC). Specifically, electron modulation was achieved through Sr doping-induced lattice distortion and oxygen vacancies, which optimized the surface charge state and generated defect dipoles to enhance local polarization. Moreover, the anisotropic rod-like morphology enhanced the flexoelectric effect under ultrasonic stimulation to promote the separation of charge carriers. Furthermore, the construction of low-resistance electronic channels at the Ba 1−x Sr x TiO 3 /Co 3 O 4 heterojunction interface accelerates the Co 2+ /Co 3+ redox cycle. Consequently, TC is effectively degraded with an efficiency of 99.39% by the BST-4/Co 3 O 4 /PMS systems. Furthermore, O 2 ·− was confirmed as the primary reactive oxygen species by free radical capture experiments. This study adopts a strategy that integrates lattice distortion, morphological design and heterostructure construction to effectively enhance the flexoelectric catalytic performance of the material. The approach provides a novel solution for the removal of antibiotics in wastewater. Graphical
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Kefan Liu,Lijie Mi,Haiwang Wang,Xinyu Xiong,Ke Zhang,Bingzhu Wang
To explore the formation mechanism of barium strontium titanate (Ba 1-x Sr x TiO 3 , BST) in a heat treatment process and the effect of the Ba/Sr proportion on the microstructure and photocatalytic activity of Ba 1-x Sr x TiO 3 , a series of Ba 1-x Sr x TiO 3 samples were synthesized by the sol-gel assisted solid phase method. A reaction mechanism model of Ba 0.7 Sr 0.3 TiO 3 was established, and the nucleation and growth processes during the heat treatment process were determined. It was found that the lattice constant of BST linearly increased as the Ba content increased. The crystal size of Ba 1-x Sr x TiO 3 increased with an increasing Ba content, but when Ba:Sr = 7:3, it was observed that the grain size was 250 nm, which was a smaller value than that of Ba 0.6 Sr 0.4 TiO 3 . In terms of photocatalytic performance, it was found that with an increasing Ba content, the carrier recombination rate gradually increased. However, when Ba:Sr = 7:3, the band gap of BST was the smallest (E g = 3.027 eV) and had the largest photocatalytic hydrogen production rate (92.05 μmol/g/h).
研究领域:
材料科学
·
光催化
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DOI
高影响因子
危险品化学品经营许可证（带存储）