Journal of Advanced Dielectrics
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2023
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IF 3.1
Hailan Qin,Jianwei Zhao,Xiaoxin Chen,Hongtian Li,Shenghao Wang,Yuxiao Du,Peifeng Li,Huanfu Zhou,Dawei Wang
BiFeO 3 –BaTiO 3 is a promising lead-free piezoelectric ceramic, exhibiting high Curie temperature and superior electrochemical characteristics. In this work, ( 1 − x ) BiFeO 3 – x BaTiO 3 (BF– x BT, x = 0 . 2 6 , 0.28, 0.30, 0.32, 0.34, 0.36) ceramics were fabricated using the conventional solid-state reaction method through precise composition control. Multiple characterization techniques, including X-ray powder diffraction (XRD), scanning electron microscope (SEM), and electrical property testing systems, were applied to systematically examine the crystallographic structure, microstructure, as well as the dielectric, ferroelectric and piezoelectric properties of the BF– x BT ceramics. The XRD results confirm that all compositions exhibit a typical perovskite structure, transitioning from a single rhombohedral phase to a rhombohedral–cubic phase mixture as the BT content increases. SEM shows apparent core–shell microstructures in the ceramics. Notably, the results demonstrated that the BF–0.30BT ceramic exhibits the maximum piezoelectric constant ( d 3 3 ) ∼ 2 1 7 pC/N, while the BF–0.34BT ceramic displays the maximum converse piezoelectric constant ( d 3 3 ∗ ) ∼ 3 2 3 pm/V, which highlights the suitability of BF–BT ceramics for high-performance piezoelectric applications.
研究领域:
材料科学
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物理学
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DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2023
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IF 4.6
Yinghua Li,Wenyue Yin,Ning Yang,Yuxin Li,Chaoqun Zhu,Lu Liu,Haibo Li,Xi Chen
A kind of easily recyclable and composite photocatalyst based on Ag/AgCl/Bi 2 O 3 /BiFeO 3 (AABB) and modified zeolite (MZ)/activated carbon (AC) were made, and investigated for the degradation of levofloxacin hydrochloride (Lev-HCl) in wastewater. The structures and morphologies of AABB@loading materials were firstly characterized. The results showed that under visible light , the optimal conditions for photodegradation were: mass ratio of MZ to AABB 3:2, AABB@MZ dosage 1–1.2 g/L, initial concentration of Lev-HCl <18 mg/L. Under these conditions, 72.09%∼ Lev-HCl could be degraded within 1.5 h. In addition, AABB@MZ could be easily recovered by gravity settling for 30 min and reused three times with 74.7% recovery rate. Photoluminescence (PL) combined with electron paramagnetic resonance (EPR) showed that photocatalysts mainly produced ·O 2 − and ·OH, which played a major role in the degradation process. Finally, a possible catalytic mechanism for AABB@MZ was suggested.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
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2022
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IF 8.431
Zelin Shan,Fang Ma,Shijie You,Lianbin Shan,Deyong Kong,Haijuan Guo,Chongwei Cui
Efficient photo-Fenton removal of antibiotic effluent is a widely followed and significant attempt to deal with the growing environmental pollution . In this study, BiFeO 3 and lanthanum doped BiFeO 3 catalysts were synthesized via one-step hydrothermal method as hydrogen peroxide activator for mineralization of norfloxacin (NOR). Various characterization measurements were used to verify La was successfully doped into the lattice of perovskite and investigated the effect of La doping molar ratio on BiFeO 3 through the characterization of the morphology and physicochemical properties . The degradation experiment and reaction rate constants showed that the La-doped BiFeO 3 particle exhibited superior photo-Fenton catalytic performance to undoped BiFeO 3 . Especially, the degradation efficiency of 15% La-doped BiFeO 3 could reach up to 84.94%. And the first order kinetic constant of optimized conditions was 0.01638 min −1 , which was about 6.9 times than that of undoped BiFeO 3 .The influence of pH, oxidizer content and catalyst dosage in photo-Fenton reaction were investigated detailedly. Besides, the synthetic catalyst possessed favorable stability and reusability with little metal leaching after many cycles of use. Radical scavenger experiments and electron spin resonance tests were carried out to conclude that the ·OH and holes were regarded as the dominate active species in the catalytic process. The narrow band gap and excellent electron transfer efficiency were the key factors for La-doped BiFeO 3 to have high catalytic efficiency in the photo-Fenton system. Current works demonstrated the great promise of La-doped BiFeO 3 in the elimination of antibiotic organics.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2024
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IF 10.7
Yanmei Wu,Hong Zhang,Yilin Xu,Zhiruo Tang,Zhicheng Li
PVDF-based electrolytes are promising candidates for solid-state lithium batteries (SSLBs) due to their high safety, interface compatibility and electrochemical stability. However, the low ionic conductivity of PVDF and uncontrollable dendrite growth in the related SSLBs restrict their development and application. Herein, ferroelectric BiFeO3 is introduced into PVDF to improve its electrolyte performance. The developed PVDF-based composite electrolytes achieve a high ionic conductivity (1.39 × 10−4 S cm−1) and Li+ transference number (0.35). Benefitting from the introduced BiFeO3, the assembled Li symmetrical batteries exhibit good cycle performance and can steadily cycle for 2500 h at 0.1 mA cm−2, at 25 °C. Matched with LiNi0.8Co0.1Mn0.1O2 cathodes, the assembled batteries show excellent long-term cycling stability with a capacity retention of 94% after 100 cycles at 0.1C and capacity retention of 89% after 400 cycles at 0.3C. The ferroelectric effect of BiFeO3 restrains the inhomogeneous electric field and adjusts the Li+ distribution at the electrolyte/electrode interface, achieving uniform Li deposition. The ferroelectric BiFeO3 powder facilitates the decomposition of lithium salts and regulates the chemical composition of the solid electrolyte interphase (SEI).
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2025
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IF 6.9
Qingqing Zhu,Xiaojuan Zhang,Li Li,Chao Cheng,Jun Zheng,Youmin Guo,Chunchang Wang
This study focuses on enhancing the piezoelectric photocatalytic activity of BiFeO 3 through rare earth ion doping. By doping rare earth ions (La, Sm, Ce), the crystal structure, optical properties, and piezoelectric properties of BiFeO 3 are modified. The results show that the doping alters the rhombic structure, reduces the band gap, and enhances light absorption. A synergistic system combining ultraviolet − visible spectral irradiation and a high − frequency ultrasonic field was used. By monitoring the decomposition kinetics of Rhodamine B (RhB) and the generation pathways of free radicals, the multi-field coupling catalytic efficiency of piezoelectric semiconductor materials was systematically quantified. The doping significantly improves the degradation rate, with Bi 0.8 Sm 0.2 FeO 3 showing the best performance. The roles of different radicals in the degradation process are investigated, and the catalyst shows good stability and sustainability after multiple cycles.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
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2023
·Vol. 106
·期 8
·4785-4793
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IF 3.9
Dafeng Zhang,Ruiqi Zhang,Junchang Liu,Xipeng Pu,Peiqing Cai
Photocatalytic H 2 evolution technique has been proved to be one of the promising approaches to overcome the present energy and environmental issues caused by the combustion of fossil fuel. Constructing heterojunction can realize the efficient separation and migration of charges and thus achieve enhanced H 2 evolution performance. Herein, we designed and prepared a ZnIn 2 S 4 /BiFeO 3 heterojunction photocatalyst with a 3D/2D structure via an ultrasonic self-assembly process. The typical 3D/2D structure with intimate interface was obtained, which not only provided more active sites but also boosted the migration of photogenerated charges. The optimal mass ratio of BiFeO 3 in ZnIn 2 S 4 /BiFeO 3 was determined to be 10%, and a 10.5-fold increase in H 2 evolution rate in comparison with of pure ZnIn 2 S 4 was achieved. Furthermore, the ZnIn 2 S 4 /BiFeO 3 composite exhibited excellent recyclability and structural stability based on cycling experiment. A S-scheme heterojunction mechanism was revealed according to the experimental results of photocatalytic H 2 evolution and electrochemical tests.
研究领域:
材料科学
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能源与环境科学
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2022
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IF 9.221
Min Ma,Li Chen,Lin Peng,Ying Peng,Jian Bi,Daojiang Gao,Jiangtao Wu
Even if the application of semiconducting metal oxide-based gas sensors has flourished over decades, the basic understanding of how sensing characteristics are regulated remains elusive. In particular, the role of oxygen vacancy in sensing properties of p-type semiconductors has not been well investigated thus far. In this work, pristine and aliovalent ion-doped p-type multiferroic BiFeO 3 sensors were prepared by a sol-gel method, and the effect of doping on the carrier type, oxygen vacancy concentration, and gas sensing properties was studied. The gas response of BiFeO 3 increased 48 % upon 1 % Ca doping and decreased 50 % when 1 % Ti was doped in. This is because Ca-doped BiFeO 3 increases the concentration of carriers (hole) and oxygen vacancies, while Ti-doped BiFeO 3 does the opposite. In addition, the conduction characteristics of BiFeO 3 were transformed from p-type to n-type upon further substitution of Fe 3+ by Ti 4+ . This work proves that aliovalent ion doping can regulate the concentration and type of carriers in materials, as well as the control of gas sensing properties, thus shedding a light on the design of high-performance p-type semiconductors.
研究领域:
材料科学
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传感器技术
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DOI
高影响因子
Inorganic Chemistry Frontiers
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2022
·Vol. 10
·期 4
·1215-1224
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IF 7.779
Jiaqi Ding,Hangren Li,Guoqiang Xi,Jie Tu,Jianjun Tian,Linxing Zhang
The wide band gap of bismuth ferrate-based materials limits their application in optoelectronic devices, and how to achieve band gap modulation in the simplest manner is the primary requirement for their industrialization. BiFeO3 (BFO) films can achieve narrower bandgaps than those under substrate strain, interphase strain, or chemical strain. In this study, we have achieved simultaneously increased tetragonality and reduced bandgaps in the tetragonal-like phase BFO-based films through chemical strain. Co substitution can be controlled by both stoichiometric ratios and atomic deposition rates. The tetragonality can increase up to a large c/a of 1.239, and the bandgap can decrease to 1.45 eV from 2.21 eV. The oxygen vacancies are closely related to the decrease of the band gap. Density functional theory calculations indicate that the introduction of Co and oxygen vacancies essentially reduced the conduction band bottom, resulting from the hybridization energy levels of Co 3d and O 2p, respectively. This paper provides a new strategy for the regulation of the optical band gap of BFO and further reveals its underlying mechanism.
研究领域:
材料科学
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物理学
·
光学工程
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2024
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IF 8.3
Jimin Lin,Jin Qian,Yunjing Shi,Simin Wang,Jinfeng Lin,Guanglong Ge,Yin Hua,Bo Shen,Jiwei Zhai
The impact of defects on the performance of piezoelectric materials has been a topic of considerable debate, due to the competing actions of the deteriorating effect of the defects themselves on the ceramic resistance and the positive effect on the piezoelectric performance resulting from the defect polarization. In order to probe its combined influence on piezoelectric properties, here, we designed BiFeO3 (BF)-based ceramics with different defect concentrations. It has been demonstrated that the incorporation of an appropriate concentration of defects into ceramics can effectively enhance their piezoelectric properties while maintaining their insulating properties. During the polarization process, both the intrinsic polarization and defect dipoles are oriented along the direction of the electric field. This occurs in the presence of a high temperature environment as well as an applied electric field, which results in a complementary enhancement of the macroscopic ferro- and piezoelectric properties. Consequently, the piezoelectric performance of BF–BT–BKT ceramics is achieved (d33 = 203 ± 5 pC/N, TC = 502 °C, kp = 33.05%). This work provides a framework for understanding the intrinsic structural mechanism of bismuth ferrate.
研究领域:
材料科学
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物理学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
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2012
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IF 1.751
Lei Wang,Jin-Bao Xu,Bo Gao,Liang Bian,Xue-Ying Chen
Pure phase BiFeO 3 powders were successfully synthesized by direct thermal decomposition of metal nitrates at 500 °C. The as-prepared BiFeO 3 had a perovskite structure which was studied using X-ray diffraction. The porous structures were investigated through scanning electron microscopy. Morphology of BiFeO 3 changed from micron-sized porous structures to nano-sized particles as NH 3 HCO 3 was added. Furthermore, the mechanism of formation of BiFeO 3 was also discussed through X-ray diffraction, thermogravimetry and differential scanning calorimetry . The optical absorption band gap of the micro-sized porous structure BiFeO 3 is 1.8 eV.
研究领域:
材料科学
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物理学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 18
·2545
·
IF 5.3
Lin Li,Qi Li,Dongqing Wang,Yubo Zhang,Fei Li,Yaru Zhang,Tifeng Jiao
The catalytic treatment of wastewater serves as an effective way to solve the problem of water pollution, in which non-homogeneous Fenton catalysts are widely used. However, the activity enhancement of non-homogeneous Fenton catalysts still remains a great challenge. Herein, self-assembled BiFeO3/CeO2nanocatalytic materials with different molar ratios were successfully fabricated by a suspension blending method, following which the structure evolution was determined by various characterizations. The catalytic degradation of methylene blue (MB), rhodamine B (RhB), and saffron T (ST) were performed over the BiFeO3/CeO2nanocatalytic materials. It was found that the 0.2BiFeO3:0.8CeO2nanocatalytic materials exhibited an 80.8% degradation efficiency for RhB. The 0.6BiFeO3:0.4CeO2nanocatalytic materials reached 81.1% and 48.7% for ST and MB, respectively. The BiFeO3/CeO2nanocatalytic materials also showed a good stability during several cycles. The combination of CeO2with BiFeO3led to an enhanced activity for dye degradation, probably due to the electron transfer from ≡Fe2+to ≡Ce4+. This study provides a new approach to dye degradation by using Fenton catalytic systems.Keywords:CeO2;BiFeO3;nanocatalytic materials;non-homogeneous Fenton catalysts;dye degradation
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·
IF 3.9
Lu Liu,Xiao Li Zhu,Xiang Ming Chen
In the present work, the strategy of multielements co-substitution for BiFeO 3 ceramics was adopted to enhance the ferroelectricity and magnetoelectric coupling effect where the effective radius of rare-earth ions was equivalent to that of Sm 3+ . Differing from the case of Sm-substituted BiFeO 3 ceramics, the symmetry of the present ceramics changed from R3c to Pbnm directly without the formation of Pna 2 1 with increasing RE-substitution content. The ferroelectricity was significantly improved, and the saturated polarization−electric field ( P - E ) hysteresis loop with P r = 37.63 μC/cm 2 was obtained in Bi 0.95 (La 0.20 Nd 0.20 Sm 0.20 Gd 0.20 Lu 0.20 ) 0.05 FeO 3 ceramics. The leakage current was reduced by almost six orders of magnitude in multielements co-substituted BiFeO 3 ceramics, which was much lower than that of BiFeO 3 end-member. Moreover, the magnetoelectric coupling coefficient α ME of 0.96 mV/cm Oe was achieved in Bi 0.86 (La 0.20 Nd 0.20 Sm 0.20 Gd 0.20 Lu 0.20 ) 0.14 FeO 3 ceramics, which was larger than that of Sm-substituted BiFeO 3 ceramics. The strategy of multielements co-substitution might provide a new approach to improving ferroelectricity and magnetoelectric coupling effect in BiFeO 3 ceramics, which could be physically interpreted as the results of the reduced leakage current and increased local polarization configuration caused by the multiple elements substitution.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
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