NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 47
·期 7
·3471-3480
·
IF 3.925
Qichang Zhang,Yanmin Jia,Jing Chen,Xiaoxing Wang,Luohong Zhang,Zhi Chen,Zheng Wu
In this work, the construction of heterostructures is considered to be an outstanding method to enhance the decomposition ratio in the piezocatalysis process. Piezoelectric BiFeO3/ZnO heterostructure nanomaterials synthesized via a mixing–calcining method exhibit an enhanced piezocatalysis performance through collecting vibration energy to decompose rhodamine B (RhB) dye. After undergoing 180 min vibration, with the different ZnO contents of 0 wt%, 1 wt%, 2 wt%, 3 wt%, 4 wt% and 5 wt%, the BiFeO3/ZnO heterostructures can respectively decompose 73.4%, 87.0%, 96.9%, 92.9%, 67.9% and 55.1% RhB dye. The kinetic rate constant of the RhB dye decomposition is 21.0 × 10−3 min−1 for the BiFeO3/2%ZnO heterostructures, while it is only 7.37 × 10−3 min−1 for the BiFeO3. The reason for the enhanced piezocatalytic dye decomposition ratio may be that the heterostructure effectively separates the positive and negative charges to reduce the recombination of the positive and negative charges. These main medium active species such as hydroxyl radicals (˙OH) in the process of piezocatalysis are confirmed on the basis of the results of both electron spin resonance and active species capture experiments. The BiFeO3/ZnO heterostructures, with a strongly enhanced piezocatalytic dye decomposition performance, offer a promising option to treat wastewater through collecting environmental vibration energy in the future.
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
CHEMICAL PHYSICS
·
2024
·
IF 2
Xuecheng Ren,Mingxing Xiao,Kaidong Zhan,Fan Wu,Quinn Qiao
Inorganic lead-free perovskite Cs 3 B i2 I 9 has attracted extensive attention due to its enhanced stability and environmental friendliness. However, the photon-to-current conversion of Cs 3 B i2 I 9 perovskites is not efficient, partly due to inefficient electron-hole separation. In this manuscript, BiFeO 3 was deposited at the interface of Cs 3 Bi 2 I 9 /TiO 2 as the interface modifier by sol–gel method, and the photocurrent and responsiveness of the Cs 3 B i2 I 9 /BiFeO 3 /TiO 2 were significantly higher than those of the Cs 3 B i2 I 9 /TiO 2 based device. Kelvin probe force microscope, photoelectrochemical impedance spectroscopy and in-situ surface photovoltage spectra demonstrated that a self-polarized electric field of BiFeO 3 contributed to the separation of photogenerated charge carriers at the Cs 3 B i2 I 9 /TiO 2 interface. By analyzing the surface photovoltage phase spectra via a vector model method, complicated surface photovoltage processes were identified, and a detailed relationship between photocurrent generation and transfer characteristic of the photogenerated charge carriers have been discussed.
研究领域:
材料科学
·
光电化学
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产品关联
DOI
高影响因子
ACS Applied Electronic Materials
·
2025
·
IF 4.7
Jifeng Pan,Yunsong Li,Tian Tian,Zilong Tang,Zichao Lian,Nan Ma
The development of advanced humidity sensors is becoming increasingly essential for the progression of various industries, particularly for integration with IoT devices. Consequently, the creation of high-performance humidity sensors is of paramount importance. In this study, we present a highly sensitive humidity sensor based on the ferroelectric oxide BiFeO3, which is further enhanced by the incorporation of the hydrophilic inorganic salt NaCl. By optimizing the NaCl content and the thickness of the sensing film, the 15 wt % NaCl-BiFeO3 sensor with a film thickness of 68 μm demonstrated an exceptional response of 10,073 as the relative humidity was varied from 13 to 86% RH at room temperature, representing a 46.3-fold enhancement compared to pure BiFeO3-based sensors. The sensor also exhibited rapid response and recovery times of 0.27 and 5.73 s, respectively. The excellent humidity sensing performance can be attributed to the increased electrical conductivity, which results from the generation of free ions due to NaCl dissolution in adsorbed water under high humidity conditions. Furthermore, this highly sensitive sensor is well-suited for noncontact applications, such as human respiratory monitoring and contactless control. This work underscores the potential of NaCl-BiFeO3 as a highly promising material system for high-performance humidity sensors in smart sensing applications.
研究领域:
材料科学
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物联网技术
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传感器技术
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 19
·15520-15532
·
IF 2.779
Zhang Xiaoyan,Yang Xu,Wang Zhaopeng,Pan Qi,Chu Baojin,Zuo Ruzhong
Our previous work proposed that except for ferromagnetic and piezoelectric properties, mechanical quality factor is also an important parameter for high magnetoelectric response of BiFeO 3 -based multiferroic ceramics. In this work, in order to improve the mechanical quality factor of BiFeO 3 -based ceramics and obtain higher magnetoelectric response, we use Mn as a dopant and prepare 0.75BiFe 1− x Mn x O 3 -0.25BaTiO 3 ( x = 0, 0.0025, 0.005, 0.0075, 0.01) ceramics. The dielectric, piezoelectric, magnetic, and magnetoelectric properties of the ceramics with different Mn doping levels and different sintering temperatures are studied comprehensively. We find that the piezoelectric response, mechanical quality factor, ferromagnetic property, and magnetoelectric response can be improved by optimization of the composition and sintering temperature of the ceramics. A large magnetoelectric coefficient α E \(\sim\) 2 V/(cm Oe) is achieved at resonant frequency when doping content of Mn is 0.75 mol% and sintering temperature is 1030 \(\mathrm{^\circ{\rm C} }\) . Such high value of α E is attributed to the combined effect of improved mechanical quality factor, high piezoelectric coefficient, and enhanced ferromagnetism. It is among the largest α E values obtained in single-phase BiFeO 3 -based ceramics. Moreover, our work further verifies the mechanical quality factor is an important parameter to achieve a high magnetoelectric response in BiFeO 3 -based ceramics.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
·
IF 6.2
Jingjing Ning,Zihan Kang,Ni Qin,Mengshi Chen,Jiang Wu,Dinghua Bao
Piezocatalysis, which is capable of directly converting mechanical energy into chemical energy, has been identified as a promising strategy for environmental wastewater remediation and clean energy production. Regrettably, the present piezocatalysis is still in the early stage and the piezocatalytic activity is still far from ideal. Thus, exploring and discovering more efficient catalyst design strategies remains a challenge. In this work, a novel and simple method was employed to synthesize a piezocatalytic BiFeO 3 (BFO) using metal-organic frameworks (MOFs) as precursors, and the MOFs derived BFO (MOF-BFO) has excellent piezocatalytic activity. The maximum reaction rate constant ( k ) for rhodamine B (RhB) can reach 1.70 × 10 −2 min −1 , which is about 4.7 times that of the sample annealed at 700 °C (BFO-700, 0.36 × 10 −2 min −1 ) and about 10.3 times that of the sample annealed at 450 °C (BFO-450, 0.17 × 10 −2 min −1 ) using conventional one pot co-precipitation method. The MOF-BFO catalyst is also suitable for degradation of other typical dyes, including methylene blue (MB) and methyl orange (MO), dramatically increasing its utility against complex wastewater components. What's more, the analysis indicates that the concentration of oxygen vacancy (O V ) may be the primary factor influencing the piezocatalytic performance. Thus, the effect of O V concentration on piezocatalytic activity is further studied, which acts like a double-edged sword, manifesting that creating moderate O V is crucial for regulating piezocatalytic performance. This study not only demonstrates the potential of MOF-BFO as a candidate material for piezocatalytic applications, but also offers insights for the development of efficient piezocatalysts in future.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
ACS Applied Electronic Materials
·
2022
·
IF 4.494
Xinyu He,Tao Wang,Xudong Li,Sujit Das,Xingjun Liu,Zuhuang Chen
Piezoelectric ceramics with combined high piezoelectric performance and excellent thermal stability are important and urgently needed for actuation and sensor applications in harsh environments, such as aerospace, automotive, oil, and gas exploration industries. However, the development of such piezoceramics is still a highly challenging task because an enhanced piezoelectric response is generally accompanied by a decrease in thermal stability. Here, we report that 0.55Bi1–xSmxFeO3–0.45PbTiO3 piezoceramics exhibit a balanced trade-off between piezoelectric response and thermal stability near the morphotropic phase boundary (MPB), where piezoelectric coefficient d33 (275 pC N–1) barely changes even at a temperature as high as 320 °C and the well-squared shape P–E hysteresis loop persists even at a high temperature of 220 °C. Compared with La3+, Sm3+ has a smaller ionic radius than Bi3+ or Pb2+ and thus could be more effectively to induce MPB at a relatively low substitution level (x = 0.16–0.21). In turn, the thermal stability of the piezoceramics does not degrade significantly. Our results further demonstrate that Sm substitution induces a strong relaxor behavior in the ceramics. These results suggest that the Sm3+-doped BiFeO3-PbTiO3 ceramics hold great promise for high temperature piezoelectric applications.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
·
2021
·
IF 2.993
Jinxiang Guo,Zhaofei Tong,Qihua Liang,Fangyu Gan,Lepeng Wei,Qingrong Yao,Jianqiu Deng,Zhao Lu,Huaiying Zhou
Bi 1-x Pr x FeO 3 material with perovskite structure was prepared using organic tartaric acid-assisted sol–gel self-propagating combustion method to obtain high-efficiency microwave absorption materials. The influence of the introduction of Pr on dielectric properties and permeability was further studied. After 15% Pr introduced, the lowest reflection absorption loss reaches –32.34 dB, but the absorption bandwidth is only 2.25 GHz. When Pr is 5%, the lowest reflection absorption loss value of −27.31 dB is obtained, and the effective bandwidth which below −10 dB is 3.41 GHz. The structural changes in the process of Pr replacing Bi were analyzed to explore the properties of BPFO perovskite. The influence of strong interaction force, residual magnetization, and natural resonance of ceramic nanoparticles on microwave absorption performance was explored. This work supplies a reliable candidate material for making up electromagnetic attenuation ceramic materials with excellent properties.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2019
·Vol. 30
·期 6
·1906232
·
IF 15.621
Rudai Zhao,Nan Ma,Kai Song,Ya Yang
BiFeO 3 (BFO) is a potentially important Pb-free ferroelectric with a narrow bandgap and is expected to become a novel photodetector. The photocurrent in BFO 3 strongly depends on the temperature but only a few studies have investigated in detail the relationships between photocurrent and temperature. Here, the temperature-dependent photocurrent and the corresponding photosensing properties of a Ag/BFO/indiumtin oxide (ITO) photodetector based on an optimized planar-structured electrode configuration are investigated. The photocurrent and responsivity of the BFO 3 -based photodetector can first be increased and then be decreased with increasing temperature. The largest photocurrent and responsivity can reach 51.5 µA and 6.56 × 10 −4 A W −1 at 66.1 °C, which is enhanced 126.3% as compared with that at room temperature. This may be caused by the temperature-modulated bandgap and barrier height in Ag/BFO/ITO device. This study clarifies the relationship between photosensing performance and the operating temperature of BFO-based photodetector and will push forward the application of ferroelectric materials in photoelectric field.
研究领域:
材料科学
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光电领域
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 107
·期 1
·205-213
·
IF 3.9
Shenghao Wang,Hongbo Liu,Yuanyuan Wang,Hailan Qin,Jianwei Zhao,Zhilun Lu,Zhu Mao,Dawei Wang
BiFeO 3 –SrTiO 3 (BF–ST) ceramics have been considered a novel class of lead-free dielectric materials exhibiting notable dielectric constants and remarkable thermal stability. In this work, we fabricated a series of (1 − x )BF– x ST (0.32 ≤ x ≤ 0.44) ceramics near the morphotropic phase boundary and comprehensively investigated their microstructure and electrical properties, which seeks to optimize the piezoelectric performance. As the ST content increases, a gradual reduction in the rhombohedral phase fraction is observed alongside a corresponding increase in the cubic phase fraction. Although x = 0.38, the maximum grain size of 5.66 μm is obtained, accompanied by a distinctive heterogeneous core–shell microstructure, which demonstrates a high remanent polarization of 51.2 μC/cm 2 and a maximum d 33 value of 72 pC/N. Furthermore, impedance spectroscopy analysis reveals the formation of a conductive core and a nonconductive shell within the sample. These findings highlight the potential of optimized BF–ST ceramics as promising alternatives to lead-based piezoelectric materials, offering exceptional ferroelectric and piezoelectric properties.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 11
·116513
·
IF 4.316
Yuanyuan Jiang,Rajesh Pathak,Tiansheng Zhang,Haibin Xu,Xiaoyi Li,Ronghua Jian,Fan Wu
The solution-processed TiO2/BiFeO3/BiOI ternary heterojunction with cascade energy level alignments was developed for photoelectrochemical conversion, in which, BiOI was deposited on BiFeO3 sensitized TiO2 mesoporous film by spin-coating method. BiFeO3 as ferroelectric material was served here as a mediator for improvement of charge separation and transfer. The photocurrent generation in TiO2/BiFeO3/BiOI sample are very stable, even measured after 50 light on/off cycles with 2000 s. Moreover, compared with the TiO2/BiOI film, TiO2/BiFeO3/BiOI film showed about twice as high photocurrent density and photocatalytic activity. Kelvin probe force microscope showed that the surface potential of TiO2/BiFeO3/BiOI film was 0.456 V, which was obviously larger than 0.226 V in TiO2/BiOI sample. The increased surface potential should originate from the polarization electric-field Eself by BiFeO3 interlayer, in which the direction of electric-field was directed toward the BiOI. The presence of Eself consequently resulted in the better dissociation of photo-generated electrons and holes. Charge transport dynamics suggested that charge transfer rate increased from 6.813 s−1 of TiO2/BiOI heterojunction to 22.280 s−1 of TiO2/BiFeO3/BiOI heterojunction, and surface charge recombination rate reduced from 10.305 s−1 of the TiO2/BiOI to 7.707 s−1 of TiO2/BiFeO3/BiOI heterojunction, which results in the enhanced photoelectrochemical conversion in TiO2/BiFeO3/BiOI heterojunction.
研究领域:
材料科学
·
光电化学
·
纳米技术
·
能源材料
✓ 已验证
DOI
高影响因子
VACUUM
·
2025
·
IF 3.9
Qian Sun,Zixuan Wang,Hongxing He,Huaying Liu,Huan Li,Xiaoning Tang
Visible-light-driven catalytic antimicrobial technologies have garnered significant attention, and enhancing light harvesting and charge-separation efficiencies in photocatalysts is crucial for designing and applying these catalytic materials. This study reports the fabrication of a ZnO/BiFeO 3 heterojunction composite photocatalyst, where BiFeO 3 (BFO) was synthesised using a facile hydrothermal method and ZnO nanoflakes were grown in situ on the BFO surface. The resulting multilayer structure enhances the photoluminescence and provides abundant active sites, while an S-type heterojunction is formed due to the rational valence band matching of the two materials, which establishes a unique channel and contributes to the photocatalytic efficiency. Consequently, the fabricated ZnO/BFO heterostructures exhibited excellent solar-driven photocatalytic antimicrobial activity. This work innovatively constructs an S-scheme ZnO/BiFeO 3 heterojunction through in situ growth, which achieves exceptional antibacterial efficiency (99.9% within 30 min) and enables facile magnetic recovery, providing a novel strategy for sustainable water treatment. This study presents a promising strategy for developing advanced photocatalytic antimicrobial materials and contributes to advancements in water-treatment technology.
研究领域:
材料科学
·
环境科学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Dan Xu,Wenjie Zhao,Wenping Cao,Weili Li,Weidong Fei
The lead-free BiFe 1- x (Li 0·5 Nb 0.5 ) x O 3 ceramics with x = 0.00, 0.01, 0.02, 0.04, 0.06, and 0.08 were modified by Li/Nb co-doping. X-ray diffraction measurements indicated that all the ceramics had a rhombohedral distorted perovskite structure and secondary phases appeared when x = 0.00, 0.04, and 0.06. The BiFeO 3 ceramics with a small amount of Li/Nb co-doping exhibited improvements in the remnant polarization (2 P r ) and ferroelectric P - E loop shape compared with the results of pure BiFeO 3 (BFO). The decreased dielectric loss and leakage current indicated that proper Li/Nb co-doping for the Fe-site in BFO was a promising route to improve the leakage behavior and enhance the resistivity. These improved electrical properties were related to the reduction of oxygen vacancies and suppression of the formation of Fe 2+ . The leakage mechanism was also discussed and analyzed.
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）