NANO
·
2016
·
IF 0.951
Guoliang Fan,Liu Zhao,Cairong Gong,Jia Ma,Gang Xue
Copper catalysts prepared using two kinds of supports (BaTiO 3 and Fe 2 O 3 @BaTiO 3 ) have been tested for soot combustion. Perovskite-type oxide BaTiO 3 shows excellent properties as support but has small specific surface area. Fe 2 O 3 @BaTiO 3 core/shell microspheres, as improved support of BaTiO 3 support, were fabricated by a hydrothermal-annealing approach. Fe 2 O 3 @BaTiO 3 support has large specific surface area, which optimizes the contact condition of the gas-soot-catalyst three-phase reaction. Due to the Cu-Fe 2 O 3 @BaTiO 3 interaction, the redox properties of copper are improved. Soot combustion is tested under O 2 gas flow and NO x /O 2 gas flow, and Fe 2 O 3 @BaTiO 3 supported copper catalyst (Cu/Fe 2 O 3 @BaTiO 3 ) all shows higher catalytic activity and CO 2 selectivity than BaTiO 3 supported copper catalyst (Cu/BaTiO 3 ) .
研究领域:
催化化学
·
环境科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yongjin Chen,Yuanmin Zhu,Abbas Nasir,Renhong Liang,Ping Liao,Liwen Zhu,Songbai Hu,Shusheng Pan,Shanming Ke,Ren-Kui Zheng,Mao Ye
Piezocatalysis has emerged as a green and efficient technology to address widespread environmental challenges and public health concerns. However, scalable fabrication of high-performance, cost-effective piezocatalysts remains challenging. Herein, we propose a facile strategy utilizing rare-earth element doping to significantly enhance the piezocatalytic performance of BaTiO 3 ceramic powder synthesized via solid-state sintering. The Er-doped BaTiO 3 demonstrates exceptional RhB dye degradation with a rate constant of 257 × 10 −3 min −1 , representing a 4.9-fold improvement over pristine BaTiO 3 and surpassing reported lead-free perovskite piezocatalysts. Remarkably, even at ultralow piezocatalyst loading (2.5 mg 1 mol% Er-BaTiO 3 in 5 mg/L RhB), the system maintains a high reaction rate constant of 241 × 10 −3 min −1 . This performance enhancement originates from Er 3+ -induced polarization intensification, oxygen vacancy proliferation, and charge carrier density elevation. Our work establishes an effective strategy for developing high-efficiency piezocatalytic materials with promising applications in wastewater remediation.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2021
·
IF 4.126
Joshua Adedeji Bolarin,Zhao Zhang,Hujun Cao,Zhi Li,Teng He,Ping Chen
This paper seeks to present notable insights into the catalytic behavior of a ferroelectric BaTiO3 nanomaterial at the boundary plane in the separation of MgH2 starting from 185 °C. The synergy between mechanical milling and enhanced electronic distribution at the surface of BaTiO3 aided magnesium to a remarkable absorption of 4.5 wt % H2 at room temperature under 30 bar within 20 h. The composite released H2 ∼ 5.7 wt % in 15 min at 310 °C and ∼5.1 wt % in 90 min at 250 °C. The lowered activation energy of decomposition was calculated to be ∼60 kJ/mol with a decomposition enthalpy of 72.3 kJ/mol-H2. The composite reversibly produced ∼5.7 wt % H2 across 20 cycles in less than 120 h at 300 °C. As revealed by detailed experimental results, the interplay between +4 and +3 states of titanium at “111” twin boundaries of BaTiO3, and the formation of oxygen vacancies, play an important role in improving the sorption kinetics and the reversibility of Mg/MgH2. Meanwhile, the anomalous ferroelectric character of the +2 state of barium around Ti–O and Mg after milling of BaTiO3 is also believed to slightly enhance MgH2 desorption enthalpy via a chemisorption process. Our findings have brought MgH2 a few steps closer to practical applications.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2015
·Vol. 17
·期 9
·1944-1951
·
IF 4.034
Mingkai Han,Yangchun Rong,Qiang Li,Xianran Xing,Longtian Kang
BaTiO3 (BTO) nanoparticles (NPs) with various sizes from 6 to 210 nm were synthesized by a one-step hydrothermal method. The powder X-ray diffraction (XRD) patterns, scanning electron microscopy (SEM) and high resolution transmission electron microscopy (HRTEM) display the formation of highly crystalline BTO NPs with a narrow size distribution. The size effect of BTO NPs on crystal structures and thermal expansion was investigated according to refined high-temperature XRD data obtained through a full-profile Rietveld method. These results show that unit cell volume (UCV) drastically increases and tetragonality (the c/a ratio) decreases as the size of BTO NPs is reduced. The coefficients of thermal expansion (CTE) of different BTO NPs reveal that the size dependence of positive thermal expansion of BTO mainly results from the ferroelectrostriction of the tetragonal phase. Through further analysis, we find that the mixed phase of tetragonal and cubic BTO may be a core/diffused shell structure which changes with decreasing NP size. Furthermore, it is speculated that the core/shell structure or tetragonality disappears when the size of BTO NPs is reduced to about 12 nm. The value is in accordance with the obtained results through the study of the change of Raman spectra and the ratio of c/a with the size of BTO NPs as well as with the reported reasonable results in the range of 5–16 nm.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
RARE METALS
·
2023
·Vol. 42
·期 4
·1261-1273
·
IF 8.8
Li Yang,Tang Ming-Yang,Zhang Zhong-Gang,Li Qi,Li Jing-Lei,Xu Zhuo,Liu Gang,Li Fei
BaTiO 3 ceramics are difficult to withstand high electric fields, so the energy storage density is relatively low, inhabiting their applications for miniaturized and lightweight power electronic devices. To address this issue, we added Sr 0.7 Bi 0.2 TiO 3 (SBT) into BaTiO 3 (BT) to destroy the long-range ferroelectric domains. Ca 2+ was introduced into BT-SBT in the form of CaTiO 3 (CT), which has the effect of inhibiting the movement of A-site defects to reduce dielectric loss and refining the grains to increase the breakdown field strength. In addition, we have increased the density and grain uniformity of ceramics by repeated rolling of the green samples through the viscous polymer processing (VPP), to further increase the breakdown electric field. The BT-SBT-CT ceramics exhibit the high recoverable energy storage density of 4.0 J·cm −3 under electric field of 480 kV·cm −1 . Its recoverable energy storage density varies by less than 8% in the temperature range of 30–150 °C, indicating good temperature stability of the energy storage performance. In this work, the energy storage performance of barium titanate-based ceramics was greatly improved by transforming ferroelectrics into relaxor ferroelectrics and VPP method, which can bring new inspiration for the research of energy storage ceramics. Graphical abstract
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
Environmental Science-Water Research & Technology
·
2022
·Vol. 8
·期 12
·3007-3018
·
IF 5.819
Yanning Lv,Minghao Sui,Xinyuan Lv,Jingni Xie
Antibiotics, as emerging trace organic pollutants in water sources, pose a potential threat to drinking water safety. Piezoelectric catalysis is an innovative and green advanced oxidation technology in which mechanical energy can be converted into electrical energy or chemical energy, even without the addition of chemical reagents. Thus, piezoelectric catalysis can be used to degrade trace organic pollutants in water. However, such studies have seldom been reported. In this work, the performance of a typical piezoelectric catalyst, i.e., BaTiO3 (BTO), with mechanical energy from ultrasound (US) for the piezoelectric degradation of sulfamethoxazole (SMX) in water was studied systematically. The results showed that the BTO/US piezoelectric catalytic system exhibited the efficient degradation of SMX. The operating parameters in the BTO/US system were optimized for the effective degradation of SMX, and the influencing factors (initial concentration of SMX, pH, and the coexisting constituents in water) affecting the degradation of SMX by BTO/US were investigated. In addition, the reaction mechanism of the piezoelectric system was investigated via identifying the active species generated in BTO/US through quenching tests and electron paramagnetic resonance analysis. It was found that US could activate BTO to generate hydroxyl radicals (˙OH), superoxide radicals (˙O2−), and singlet oxygen (1O2), thus greatly enhancing the SMX degradation efficiency. Overall, the present study demonstrates that the BTO/US system is a promising form of technology for the green degradation of trace organic pollutants in water.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Xianhong Zhang,Sidi Zhao,Fang Wang,Yuhong Ma,Li Wang,Dong Chen,Changwen Zhao,Wantai Yang
Polymer based dielectric composites were fabricated through incorporation of core-shell structured BaTiO 3 (BT) nanoparticles into PVDF matrix by means of solution blending. Core-shell structured BT nanoparticles with different shell composition and shell thickness were prepared by grafting methacrylate monomer (MMA or TFEMA) onto the surface of BT nanoparticles via surface initiated atom transfer radical polymerization (SI-ATRP). The content of the grafted polymer and the micro-morphology of the core-shell structured BT nanoparticles were investigated by thermo gravimetric analyses (TGA) and transmission electron microscopy (TEM), respectively. The dielectric properties were measured by broadband dielectric spectroscopy. The results showed that high dielectric constant and low dielectric loss are successfully realized in the polymer based composites. Moreover, the type of the grafted polymer and its content had different effect on the dielectric constant. In detail, the attenuation of dielectric constant was 16.6% for BT@PMMA1/PVDF and 10.7% for BT@PMMA2/PVDF composite in the range of 10 Hz to 100 kHz, in which the grafted content of PMMA was 5.5% and 8.0%, respectively. However, the attenuation of dielectric constant was 5.5% for BT@PTFEMA1/PVDF and 4.0% for BT@PTFEMA2/PVDF composite, in which the grafted content of PTFEMA was 1.5% and 2.0%, respectively. These attractive features of BT@PTFEMA/PVDF composites suggested that dielectric ceramic fillers modified with fluorinated polymer can be used to prepare high performance composites, especially those with low dielectric loss and high dielectric constant.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2021
·
IF 17.881
Xiaoting Liu,Xiaofang Shen,Baisheng Sa,Yinggan Zhang,Xin Li,Hao Xue
The piezoelectric effect can effectively modulate the energy band structure of the optoelectronic semiconductor and the transport behavior of carriers. Here, we propose a BaTiO 3 /SrTiO 3 nanocomposite , and effectively enhance its photocatalytic performance through piezoelectric effect. The heterostructured BaTiO 3 /SrTiO 3 nanofibers were prepared by electrospinning, and they were polarized by a high-voltage electric field. Under the co-excitation of ultrasonic and UV irradiation, the BaTiO 3 /SrTiO 3 nanofibers presented excellent degradation ability of pollutants in water. The BaTiO 3 /SrTiO 3 nanofibers can degrade Rhodamine B (RhB) dye by ~97.4% within 30 min under the combined action of ultrasonic and ultraviolet irradiation, which was 2.2 times that of pure SrTiO 3 nanofibers. The piezoelectric effect provides a built-in polarization field to improve the separation efficiency of photo-generated carriers. Moreover, DFT calculation results showed that piezoelectric potential can reduce the band gap width of the SrTiO 3 . This article provides a promising strategy for improving photocatalytic performance of nanocomposites through the use of mechanical energy.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2019
·
IF 3.973
Cijun Shuai,Guofeng Liu,Youwen Yang,Wenjing Yang,Chongxian He,Guoyong Wang,Zheng Liu,Fangwei Qi,Shuping Peng
Piezoelectric effect of polyvinylidene fluoride (PVDF) plays a crucial role in restoring the endogenous electrical microenvironment of bone tissue, whereas more β phase in PVDF leads to higher piezoelectric performance. Nanoparticles can induce the nucleation of the β phase. However, they are prone to aggregate in PVDF matrix, resulting in weakened nucleation ability of β phase. In this work, the hydroxylated BaTiO 3 nanoparticles were functionalized with polydopamine to promote their dispersion in PVDF scaffolds fabricated via selective laser sintering. On one hand, the catechol groups of polydopamine could form hydrogen bonding with the hydroxyl groups of the BaTiO 3 . On the other hand, the amino groups of polydopamine were able to bond with C F group of PVDF. As a result, the functionalized BaTiO 3 nanoparticles homogeneously distributed in PVDF matrix, which significantly increased the β phase fraction from 46% to 59% with an enhanced output voltage by 356%. Cell testing confirmed the enhanced surface electric cues significantly promoted cell adhesion, proliferation and differentiation. Furthermore, the scaffolds exhibited enhanced tensile strength and modulus, which was ascribed to the rigid particle strengthening effect and the improved interfacial adhesion. This study suggested that the piezoelectric scaffolds shown a potential application in bone repair.
研究领域:
生物医学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SOLID STATE PHENOMENA
·
2018
·
IF 0
Ping Ping Zhang,Jing Man,Hong Sheng Wang,Qi Hong Wei,Ying Gai,Bao Xin Zhu,Ling Li
Si3N4-BaTiO3 composite ceramics, a type of high dielectric materials applied in the multifunction radome, were prepared by gas pressure-sintering method. The influences of BaTiO3 power content on the mechanical performances, dielectric properties and microstructure of Si3N4-BaTiO3 composite ceramics were investigated. The results showed that the sintering density, the elastic modulus and the flexural strength of Si3N4-BaTiO3 composite ceramics all firstly increased and then decreased along with the increase of BaTiO3 power in sample. Meanwhile, Relationship between BaTiO3 power content and dielectric properties of Si3N4-BaTiO3 composite ceramics within the frequency range of 8.2–12.4 GHz (X-band) was studied. The average of dielectric constant e of Si3N4-BaTiO3 composite ceramics increased from 7.33 to 9.98 and the average of dielectric loss tand increased from 2.8 ´ 10-3 to 0.0168 when the content of BaTiO3 power increased from 0 to 25 wt.%. The increase of the dielectric properties of Si3N4–BaTiO3 composite ceramics were attributed to the electronic and molecular polarization at interface between Si3N4 and BaTiO3, compared with the pure matrix Si3N4.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Yu Liu,Jian Zheng,Zhijia Zhu,Zhangmi Huang,Chunyan Hu,Baojiang Liu
Although the presence of the built-in electric field will solve the problem of carrier complexation in photocatalytic systems to some extent. However, free carriers will quickly shield the stabilized electric field and lose its effect. Therefore, how to introduce the dynamic piezoelectric field into the photocatalytic system has become an imminent problem. Herein, we developed an overcoated, visible light responsive, piezoelectric-assisted photocatalytic system by depositing Bi 2 S 3 photocatalysts with a narrow-band system onto the surface of highly piezo-responsive BaTiO 3 nanorods (BTO NRs). The heterojunction structure, bound by Bi-O chemical bonding, enhances carrier transport efficiency under the influence of the piezoelectric field. In the degradation experiments, the first-order rate constant for the degradation of chlortetracycline hydrochloride (CTC) in the BTO NRs/Bi 2 S 3 system with the optimal complex ratio was 0.0276 min −1 , which was 3.1 and 7.8 times higher than that of BTO NRs and Bi 2 S 3 , respectively. Additionally, we deduced the degradation pathways of CTC through a combination of Density functional theory (DFT) calculations and Liquid Chromatograph Mass Spectrometer (LC-MS), evaluating the toxicity of the intermediates. This complex system, featuring a highly photo-responsive semiconductor as a photo-acceptor deposited on a piezoelectric semiconductor surface providing a dynamic built-in electric field, enhances carrier separation efficiency under optimal light energy utilization conditions. These findings present novel and effective strategies for addressing two primary challenges in photocatalytic systems: low spectral utilization and significant photogenerated carrier complexation.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Wenchao Lin,Pengrong Ren,Yuhui Wan,Shu Yang
BaTiO 3 , Ba(Ti 0.2 Zr 0.2 Sn 0.2 Hf 0.2 Nb 0.2 )O 3 , SrTiO 3 , Sr(Ti 0.2 Zr 0.2 Sn 0.2 Hf 0.2 Nb 0.2 )O 3 , (Sr 0.5 Ba 0.5 )TiO 3 and (Sr 0.5 Ba 0.5 )(Ti 0.2 Zr 0.2 Sn 0.2 Hf 0.2 Nb 0.2 )O 3 ceramic samples were prepared using a traditional solid-state reaction method. XRD analysis shows that all the samples are a single-phase perovskite structure. After the addition of B-site high-entropy components Sn 4+ , Zr 4+ , Hf 4+ , and Nb 5+ in BaTiO 3 , the permittivity and dielectric loss decrease significantly, and the temperature stability of the permittivity is remarkably improved. Compared with the undoped sample, the insulation resistance of the high-entropy ceramic sample increases exponentially. The incorporation of high entropy components changes the conduction mechanism, improves the insulation performance, and significantly decreases thermal conductivity, which improves the adiabatic performance of ceramics. These results demonstrate that the high entropy strategy can significantly influence the electrical and thermal properties of BaTiO 3 and SrTiO 3 -based ceramics. Our work provides a new idea for the modification of functional ceramic materials and offers new promising candidates of dielectrics applied for Class-I type ceramic capacitors.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）