Energy & Environmental Materials
·
2026
·
IF 13.8
Wentao Yang,Panpan Lv,Guiyun Gao,Shuzhi Zhang,Hang Zhan,Cuncheng Li,Luchao Ren,Jin Qian,Mingwei Zhang
Flexible piezoelectric materials that combine high performance and outstanding flexibility are imperative for advancing next-generation wearable electronics, self-powered sensors, and energy harvesters. The creation of useful piezoelectricity in piezoelectrics requires a poling process via the temporary application of a strong electric field, which introduces risks including electrical breakdown and thermal depolarization. Here, a self-aligned polarization state is realized in compositional graded Ti-doped BiFeO 3 films via the formation of defect dipoles and the spatial modulation of strain distributions. The down-graded film, among those with different configurations, manifests a notable upward initial polarization ( P 0 = −15.7 μC cm −2 ) and a substantial internal bias field ( E bias = 167.2 kV cm −1 ). The prototype piezoelectric harvester based on the flexible down-graded film can deliver a maximum output power of 2.26 μW at a load resistance of 3.52 MΩ, a high sensitivity of 5.92 V N −1 without the need for external poling treatment, and robust mechanical durability of 8000 cycles. These advances in self-poling enable the derived films to offer significant freedom to design flexible piezoelectric devices that are well suited for microscale energy harvesters and sensors.
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2025
·
IF 3.2
Alhalili Zahrah,Shariq Mohammad,Al-Qasmi Noha,Alqahtani Zahrah,Madkhali O.,Alathlawi Hussain J.,Ali Syed Kashif,Sharma Mukul,Hasan K. F.,Elhelali Thoraya M.
This study used a sol-gel method to prepare BiFeO 3 (BFO) and strontium-doped bismuth ferrite Bi 1-x Sr x FeO 3 (x = 0, 0.01, 0.03, 0.05 and 0.09) (Sr-doped BFO) photocatalysts. The microstructural analysis of the Sr-doped BFO photocatalysts revealed a rhombohedral perovskite structure in the samples. The optical study shows that doping with Sr ions reduced the energy band gap of the photocatalyst from 2.12 eV to 1.97 eV. Moreover, the calculated saturation magnetization (Ms) value was increased after doping with Sr ions, and for Sr (x = 0.05), the doped BFO sample exhibits the highest magnetization value of 0.481 emu/g. It was revealed that the Sr (x = 0.05) doped BFO photocatalyst exhibits 91.2% degradation of methylene blue (MB) dye under visible light radiation. In this study, the formation of trap levels due to the Sr ions, as well as the formation of superoxide anions ( \({O}_{2}^{-}\) ) and OH° radicals played a significant role in the degradation of MB. Graphical
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Nanomaterials
·
2025
·Vol. 15
·期 11
·792
·
IF 4.3
Xuan Liu,Jie Chao,Feifei Guo,Liangliang Chang,Xinyang Zhang,Wei Long,Zengzhe Xi
Addressing the limitations of poor piezoelectric photocatalytic activity and insufficient magnetic recovery in pure BiFeO 3 nanoparticles, Gd and Zr co-doped BiFeO 3 nanoparticles were synthesized via the sol-gel method. The structural characterization revealed a rhombohedral-to-orthorhombic phase transition with reduced grain size (~35 nm) and lattice distortion due to dopant incorporation. An XPS analysis confirmed Fe 3+ dominance and oxygen vacancy enrichment, while optimized BGFZ9 exhibited enhanced remanent magnetization (0.1753 emu/g, 14.14 increase) compared to undoped BFO. The synergistic piezo-photocatalytic system achieved 81.08% Ofloxacin degradation within 120 min (rate constant: 0.0136 min −1 , 1.26 higher than BFO) through stress-induced piezoelectric fields that promoted electron transfer for ·O 2 − /·OH radical generation via O 2 reduction. The Ofloxacin degradation efficiency decreased to 24.36% after four cycles, with structural integrity confirmed by XRD phase stability. This work demonstrates a triple-optimization mechanism (crystal phase engineering, defect modulation, and magnetic enhancement) for designing magnetically recoverable multiferroic catalysts in pharmaceutical wastewater treatment.
研究领域:
材料科学
·
环境科学
·
化学工程
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Linxing Zhang,Jun Chen,Longlong Fan,Zhao Pan,Jiaou Wang,Kurash Ibrahim,Jianjun Tian,Xianran Xing
To settle the growing energy crisis, photovoltaic , as the renewable solar energy, based on ferroelectric oxides has recently attracted significant attention for the breakthrough in photovoltaic application. Herein, we deposited the ferroelectric Bi 0.925 Sm 0.075 Fe 0.95 Co 0.05 O 3 (BSFC) thin films on FTO glass substrates along with uniform microstructure and multi-orientation polycrystalline. The BSFC thin films possess good ferroelectric properties with a standard hysteresis loop attributed to Co-substitution. Intriguingly, an enhancement of both photocurrent (90.4%) and photovoltage (40.0%) in BSFC thin films has been observed, indicating that the ferroelectric polarization plays an important role in the bulk effect of ferroelectric photovoltaic. Furthermore, the Co-substitution induced an increasing trend in saturation magnetization of 6.2 emu/cm 3 in BSFC thin films. The enhancement of the multiferroics and photovoltaic properties facilitates its applications of energy conversion and information storage.
研究领域:
材料科学
·
能源科学
·
物理学
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Boying Wang,Hao Wang,Jiantao Wang,Chaolong Li,Feng Wang,Chunli Diao,Haiwu Zheng
Dielectric thin film capacitors are expected to be a promising candidate for high-performance energy storage devices due to their high power density, fast charge/discharge speed, and excellent stability. Nevertheless, it remains a challenging endeavor to develop dielectrics with excellent energy storage density comparable to that of commercial batteries. In this work, lead-free 0.8SrTiO 3 -0.2BiFeO 3 (0.8STO-0.2BFO) thin films with coexisting amorphous and nanocrystalline structure were prepared by a sol-gel method. The heat-treatment temperature was adjusted to form polar-nano regions, thereby modulate the breakdown strength and dielectric polarization, and increase the energy storage density. The electric potential, electric field, and current density of the films with different amorphous/crystalline volume fractions were evaluated by the finite element simulation to further verify that the proper crystallization can result in the improved polarization performance and increased breakdown strength of the films, which are beneficial to the enhancement of energy storage performance. Through structural tailoring, the 0.8STO-0.2BFO film annealed at 550 °C demonstrates the optimal energy storage properties with a giant discharge energy storage density of 65 J/cm 3 and high efficiency of 75% at room temperature. Simultaneously, a broad temperature stability (20–160 °C), superb operating frequency stability (20 Hz-2 kHz), and excellent fatigue endurance (6.3 ×10 5 ) are observed without appreciable degradation of the energy storage performance. The excellent energy storage performance indicates a widespread potential of 0.8STO-0.2BFO films in pulse power applications, such as consumer electronics, microelectronics, and medical devices .
研究领域:
材料科学
·
能源存储技术
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Advanced Materials Interfaces
·
2017
·Vol. 5
·期 3
·1701189
·
IF 4.279
Jia Qi,Nan Ma,Ya Yang
Ferroelectric material BiFeO 3 with narrow bandgap of 2.67 eV can be more suitable to fabricate photodetectors instead of solar energy harvesters because of low energy conversion efficiency. Herein, a BiFeO 3 film-based self-powered photodetector is reported by using the photovoltaic–pyroelectric coupled effect to enable a fast sensing of 450 nm light illumination. Compared with photovoltaic effect, the photosensitivity parameters including photoconductive gain, responsivity, and specific detectivity can be enhanced by more than 9.7 times at light intensity of 0.86 mW cm −2 by utilizing light-induced photovoltaic–pyroelectric coupled effect. Moreover, a self-powered photodetector array system is achieved to detect 450 nm light by analyzing the real-time recorded output voltage signals as a mapping figure. In this work a new route to realize the performance enhancement of photodetector via photovoltaic–pyroelectric coupled effect on ferroelectric materials, which has great significance in extending the field of self-powered photodetectors is described.
研究领域:
材料科学
·
光电探测技术
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高影响因子
PHYSICA B-CONDENSED MATTER
·
2025
·
IF 2.8
Dongxue Luo,Ronghua Qin,Minghang Song,Lingfang Xu,Tian Liang,Yalong Ge,Changping Yang
BiFeO 3 has profuse physical properties in multiferroics. However, significant leakage current constrains its utility in practical applications. In this paper, we synergistically embed BiFeO 3 nanoparticles in a ferroelectric crystal P(VDF-TrFE) base and use barrier layers to reduce the leakage current and promote the ferroelectric performance. Our finding indicate that the multilayer BiFeO 3 /P(VDF-TrFE) composite films equipped with barrier layers exhibit a leakage current below the magnitude of microampere level, a 99 % reduction compared to single-layer films. Additionally, the effective remnant ferroelectric polarization reaches 16 μC/cm 2 , a 66 % improvement. We combined the conductive mechanism analysis by fitting I - V curves and constructing energy band structures, uncovering that the essence of the optimization characteristics is related to a Space-Charge-Limited Conduction (SCLC) mechanism in the multilayer composite films. This research offers potential film solutions for a variety of electrical devices, supported by both experimental and theoretical perspectives.
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JOURNAL OF MATERIALS SCIENCE
·
2025
·Vol. 60
·期 47
·24439-24453
·
IF 3.9
Wang Yabo,Duan Xiaohui,Wei Yiguo,Du Gangfeng,Tian Zhengshan,Bai Suzhen,Pan Zihong,Bai Ruibing
An efficient Ag 2 WO 4 /BiFeO 3 heterojunction was successfully synthesized using a facile hydrothermal and in situ precipitation method. A comprehensive investigation was conducted into the morphological, structural, and optical properties of the Ag 2 WO 4 /BiFeO 3 heterojunction. The optimally synthesized Ag 2 WO 4 /BiFeO 3 heterojunction demonstrated an impressive removal efficiency toward Lanasol Red 5B (95.62%) within 100 min under simulated solar irradiation, which was 5.18-fold higher than pristine BiFeO 3 . The engineered heterojunction effectively optimized the electron transfer pathway, significantly enhancing the separation efficiency of photogenerated electrons and holes. A notable selectivity of the Ag₂WO₄/BiFeO₃ heterostructure was observed in the photocatalytic degradation of organic dyes under simulated solar irradiation. The removal efficiencies followed the order: Lanasol Red 5B (95.62%) > Congo red (50.47%) > Methyl red (47.16%) > Safranin T (22.22%) > Rhodamine B (8.07%) > Methyl orange (3.04%). Furthermore, active species trapping experiments confirmed that holes and superoxide radicals were the predominant reactive species driving the photocatalytic process. This simple synthesis method opens up new possibilities for developing efficient BiFeO 3 -based photocatalysts for environmental remediation purposes.
研究领域:
材料科学
·
环境修复
·
光催化
·
纳米材料
·
化学工程
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高影响因子
JOURNAL OF APPLIED PHYSICS
·
2016
·Vol. 119
·期 6
·
IF 2.101
Shi Xin Xin,Liu Xiao Qiang,Chen Xiang Ming
The evolution of structure, ferroelectric, and piezoelectric properties in Bi 1−x Sm x Fe 0.99 Ti 0.01 O 3 ceramics was extensively investigated within the entire morphotropic phase boundary region with 0 ≤ x ≤ 0.20. A sequential phase transition of R3c-Pna2 1 -Pbnm with increasing Sm content was revealed by Rietveld refinement of the X-ray diffraction data together with the macroscopic ferroelectric measurements. Both ferroelectric and piezoelectric properties showed a great enhancement in the vicinity of the R3c/Pna2 1 (polar-to-polar) phase boundary, which should be caused by the field-induced phase transition between these two phases. Such field-induced phase transition might be essentially accompanied by a change of magnetic state, which indicated a way of controlling magnetism by means of electric field.
研究领域:
材料科学
·
物理学
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Zengpeng Li,Jianfeng Dai,Danqiang Huang,XinChao Wen
BiFeO 3 –(Co/Ni)Fe 2 O 4 (BFO–(C/N)FO) multiferroic nanofibers were synthesized using a self-assembly coaxial electrospinning technique . The structure, exchange bias effect, ferromagnetic, and ferroelectric properties were investigated using various physical and chemical characterization approaches. The coexistence of a spinel–perovskite mixed structure was verified in (BFO–(C/N)FO) nanofibers by X-ray diffraction and X-ray photoelectron spectroscopy . Raman spectra revealed a distorted crystal structure or more complex phase configurations with overlapping features. Compared to the pure BFO nanofibers, the magnetic properties showed a significantly increase after recombination. BFO–NFO nanofibers exhibited higher exchange coupling through switching field distribution analysis. The ferroelectric properties of the composite nanofibers were considerably changed compared to pure BFO nanofibers, which can be attributed to the presence of impurities (Bi 2 Fe 4 O 9 ) and the asymmetrical spin in spinel ferrites. The BFO–CFO nanofibers exhibited larger leakage current and coercive electric field than the other two types of nanofibers. Hence, coupling of the structural distortion and crystal phases are important approaches in altering the ferroelectric and ferromagnetic properties. These results suggest that the BFO–(C/N)FO nanofibers have potential applications in multifunctional nanodevices .
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Yu Sun,Juan Liu,Tulai Sun,Zilong Yu,Ziyang Zheng,Mengru Ge,Lihong Bai
In this study, multiple rare earth elements were introduced to modify the multiferroic properties of BiFeO 3 . The effects of co-substitution on the structural evolution and properties were thoroughly investigated. With increasing substitution content, the ceramics underwent a symmetry transition from R 3 c to Pna 2 1 and finally to Pbnm . Co-substitution significantly enhanced the ferroelectric properties, with the highest remanent polarization of 33.14 μC/cm² observed at x = 0.10. Due to the symmetry evolution, ferromagnetism was released from the cycloidal spin structure, and the hysteresis loop gradually saturated, with the highest remanent magnetization ( M r ) of 0.25 emu/g observed at x = 0.16. The concurrent improvement in ferroelectricity and ferromagnetism resulted in substantial magnetoelectric coupling performance, with α ME = 3.50 mV/(cm·Oe). Moreover, direct current poling significantly induced the reverse transition from R 3 c to Pna 2 1 , indicating the potential for electrically controlled magnetism. This study provides a new perspective for modifying the magnetoelectric properties of BiFeO 3 .
研究领域:
材料科学
·
物理学
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高影响因子
LANGMUIR
·
2026
·Vol. 42
·期 30
·22067-22077
·
IF 4.4
He Fu,Zhou Jiahong,Guan Hongwei,Chen Yuejia,Li Zhuo,Xu Tiefu
Heterogeneous photo-Fenton technology is an efficient
advanced
oxidation process for the removal of organic pollutants in water.
This process accelerates the reduction of Fe 3+ to form
Fe 2+ by photoelectrons (e – ), thereby
enabling the sustained generation of reactive oxygen species (ROS)
for pollutant removal. In this study, a BiVO 4 /BiFeO 3 (BVO/BFO) n-p heterojunction catalyst was obtained via calcination
and wet chemical methods for tetracycline (TC) photo-Fenton removal.
The optimal ratio of BVO:BFO was 0.7:1, which can achieve 70.08% TC
degradation in 30 min ( k = 0.0147 min –1 ), markedly surpassing bare BFO and BVO, and retaining >70% efficiency
after ten cycles. The remarkable improvement of TC removal resulted
from efficient electron–hole (e – /h + ) pair separation by heterojunction in space to regenerate Fe 2+ for H 2 O 2 activation. Furthermore,
two distinct TC degradation pathways induced by h + and • OH were proposed, including dehydroxylation, demethylation,
deamidation, ring opening, and hydroxylation. This study provides
an insight into the acceleration of the Fe 3+ /Fe 2+ cycle and broadens the application of Fenton technology in the field
of environmental remediation.
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