Reaction Kinetics Mechanisms and Catalysis
·
2026
·
IF 2.1
Guo Hengjie,Meng Zeda,Lee Keonha,Oh Won-Chun
This study prepared carbon nanotube-modified BiFeO₃ (CNT‑BiFeO₃) composite photocatalysts for visible‑light‑driven degradation of ammonia nitrogen. The introduction of CNTs promotes the separation of photogenerated carriers and constructs a type‑II heterojunction with an internal built‑in electric field, which effectively suppresses electron‑hole recombination and improves photocatalytic activity. The optimized CNT‑BiFeO₃ catalyst achieves an ammonia degradation efficiency of 87.43% under visible light. With the assistance of 0.2 mmol/L H₂O₂, the degradation efficiency reaches 99.8% within 180 min, and ammonia is selectively converted into N₂ without generating nitrite or nitrate. Kinetic analysis indicates that the degradation process follows pseudo‑first‑order kinetics. The composite shows excellent reusability and stability during cycling tests. This work provides a high‑efficiency photocatalytic strategy for ammonia nitrogen removal from wastewater.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2026
·
IF 9.2
Jinxing Yu,Ri Han,Shu Jin,Xiaoxiang Xu
BiFeO 3 is a narrow-bandgap semiconductor promising for solar water splitting but is generally subject to a low photocatalytic activity due to the poor separation of photocarriers (e − and h + ). In this work, BiFeO 3 has been combined with BaTiO 3 to form the solid solutions (i.e. (BiFeO 3 ) 1-x (BaTiO 3 ) x (0 ≤ x ≤ 1)) which demonstrate a much-improved activity for photocatalytic H 2 production under visible light illumination. The solid solution strategy not only tunes the bandgap but also modifies the dielectric constant that is critical for a high photocatalytic activity. A high dielectric constant contributes to an improved photocarrier separation condition due to the screening of the Coulomb interactions between photocarriers and between photocarriers and charged defects. This work reveals a useful solid solution strategy to modify the photocatalytic performance and justifies the importance of dielectric properties for photocarrier separation.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2026
·Vol. 109
·期 3
·e70683
·
IF 4.2
Yalong Ge,Zusheng Chen,Tian Liang,Ronghua Qin,Haibo Xiao,Shiheng Liang,Ruilong Wang,Lingfang Xu
Electrocaloric cooling offers a more eco-friendly and efficient alternative to conventional vapor-compression refrigeration. Composites, incorporating ceramic nanoparticles within a ferroelectric polymer matrix, exhibit both high dielectric breakdown strength and flexibility. In this study, a sandwich-structured composite film of bismuth ferrite (BiFeO 3 )-filled poly(vinylidene fluoride-co-trifluoroethylene) (P(VDF-TrFE)) was prepared using a doctor-blade method. Distinct from terpolymers possessing relaxor ferroelectric properties, the material facilitates a more convenient indirect assessment of its electrocaloric performance. At 100 MV·m − 1 , the polymer composite containing 10 wt% BiFeO 3 achieved a maximum isothermal entropy change ( ΔS ) and an adiabatic temperature change ( ΔT ) of 113.4 kJ·K − 1 ·m − 3 and 17.2 K near the Curie temperature ( T C ) of 383 K. The ΔT of the composites is twice that of pure P(VDF-TrFE) films under the same electric field. These values significantly exceed those reported for P(VDF-TrFE)-based composites. The enhanced polar beta phase in P(VDF-TrFE) phase and enlarged local electric field caused by BiFeO 3 heterogeneous segment in the polymer matrix should both contribute to the outstanding electrocaloric performance. This research broadens the application scope of eco-friendly, flexible electronic materials that maintain stable electrocaloric refrigeration properties under high electric fields.
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2025
·
IF 4.9
Xiguang Huang,Lingfang Xu,Jinyan Wang,Changping Yang,Haibo Xiao,Shiheng Liang,Ruilong Wang
We designed novel BiFeO 3 /P(VDF-TrFE) gradient structures and spun coating composite films on a fluorine-doped tin oxide (FTO) conductive glass substrate. A large remnant ferroelectric polarization of 29.5 μC/cm 2 , a 210 % improvement over the pure P(VDF-TrFE) film, is achieved by BiFeO 3 nanoparticles embedment, with the coercive electric field E c effectively restrained by 12 %. The structure analysis showed increased polar phase, reduced crystal size, and established long chains after BiFeO 3 gradient incorporation, which are essential to the ferroelectric performances. The finite element simulation by COMSOL software illustrated an apparent potential redistribution up to 342 MV/m at an external electric field of 160 MV/m and large leakage currents around BiFeO 3 , which reflect the heterogeneous regions formed at the interfaces and they are contributive to the micromorphology. These gradient composite films have potential in the low electric field driving flexible electronic devices.
研究领域:
材料科学
·
电子工程
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Journal of Water Process Engineering
·
2024
·
IF 6.3
Jingjing Ning,Zihan Kang,Ni Qin,Mengshi Chen,Jiang Wu,Dinghua Bao
The discharge of toxic pollutants and the abuse of antibiotics present significant risks to both global food safety and public health. The utilization of clean mechanical energy for catalytic degradation has been demonstrated as a promising approach to overcome prevalent obstacles. In this work, we employ the approach of manipulating carrier separation through interface engineering to boost the piezocatalytic performance of BiFeO 3 (BFO). Specifically, a Z -scheme heterojunction is established with BFO by utilizing energy band-matching Bi 2 S 3 (BS). In contrast to the pure BFO (1.49 × 10 −2 min −1 ) and BS (1.64 × 10 −2 min −1 ), the BFO/BS heterojunction demonstrates a notable enhancement in piezocatalytic performance, reaching 3.56 × 10 −2 min −1 . This enhancement is believed to be due to the presence of a polarization field facilitating band tilt and the construction of Z -scheme heterojunction. Following the implementation of light assistance, the piezocatalytic efficiency of BFO/BS is enhanced to a greater extent (6.07 × 10 −2 min −1 ), attributing to the enhanced separation of photogenerated carriers facilitated by the piezoelectric polarization field. This study not only demonstrates the potential of BFO/BS as a catalytic candidate material by multimodal renewable energy harvesting, but also offers insights for the strategy of enhancing catalytic activity through interface engineering.
研究领域:
材料科学
·
环境科学
·
催化化学
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Lihui Yang,Wenjian Yang,Shangtao Liang,Zeqin Lin,Jianxin Pan,Cao Yang,Tingting Zhu,Sihao Lv,Hui Lin
Nitrate electroreduction (NO 3 RR) is a promising alternative route for green synthesis of ammonia, where high-efficient catalysts are desired. Herein, an inexpensive ABO 3 -type perovskite BiFeO 3 was demonstrated as a highly efficient NO 3 RR catalyst compared to most of the reported non-precious catalysts. More interestingly, a surface evolution is observed in conjunction with an enhancement in NH 3 yield rate during the NO 3 RR process. Numerous metallic Bi 0 clusters and oxygen vacancies (OVs) are in-situ generated in the reconstructed BiFeO 3 (RS-BiFeO 3 ), and are proposed to be the genuine active sites. Density functional theory calculations suggest the RS-BiFeO 3 promotes the conversion of *NO 2 to *NO and enhances the *H supply for NO 3 - hydrogenation, thus boosting NO 3 RR. The yield rate of NH 3 by the reconstructed BiFeO 3 electrode reaches 5.3 mg cm −2 h −1 with a Faradaic efficiency of 86.8% at −0.7 V vs . RHE, over 4 times higher than that of the pristine BiFeO 3 electrode. This study establishes a fundamental understanding of BiFeO 3 reconstruction during NO 3 RR, and provides insights for the rational design of perovskite NO 3 RR electrocatalysts.
研究领域:
材料科学
·
电化学
·
催化
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LANGMUIR
·
2026
·
IF 4.4
Ziwei Wu,Xinpeng Chen,Jingqi Cao,Yifeng Wang,Yongxuan Xiang,Yixiao Li,Haoyu Wang,Hongmei Cao,Tieling Xing
Photocatalysis and piezocatalysis rely on light energy and mechanical energy (via the piezoelectric effect) as driving forces, respectively. Both have been successfully applied to pollutant degradation and wastewater treatment as advanced oxidation processes. However, in this study, BiFeO3 nanoparticles derived from MIL-101 were solidified in a flexible polyvinylidene fluoride (PVDF) porous structure, forming a dynamic synergistic effect between the piezoelectrically polarized electric field induced by mechanical agitation and the photogenerated carriers. Additionally, the hydrolytic inactivation of the material was inhibited by the chemical barrier effect of PVDF, while the charge separation at the heterojunction interface was directionally driven by the built-in electric field generated by the piezoelectric effect. The BiFeO3/PVDF composite membrane degraded 97.1% of RhB after 60 min of treatment under the synergistic effect of stirring and light. Free radical trapping and electron spin resonance (ESR) analysis confirmed that •O2– and •OH were the key active species (contributing over 60%). Piezoresponse Force Microscopy (PFM) test revealed the mechanism behind the enhancement of the built-in electric field, and density functional theory (DFT) calculations combined with Fukui’s function elucidated that the N4, N5, and C6 sites in the RhB molecule were the preferred targets for free radical attack. Plant growth experiments verified the environmental safety of the system. The BiFeO3/PVDF porous composites with piezoelectric photocatalytic properties proposed in this study provide a promising solution for developing novel materials for efficient catalysis of organic pollutants in water.
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PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Huanghui Nie,Limei Ruan,Lu Hu,Xinran Wang,Fukang Chen,Shuai Zhou,Yangyang Wang,Taotao Ai,Yan Yan,Gang Liu
(1- x ) (0.98Na 0.5 Bi 0.5 TiO 3 –0.01BaTiO 3 –0.01BiFeO 3 )– x CaTiO 3 (NBB- x CT) ceramics were produced using traditional solid-state synthesis methods. The surface morphology , domain structure, and electrical properties of the ceramic samples were systematically studied. In addition, the temperature and frequency stabilities of the NBB-15CT sample at 200 kV/cm were tested. Generally, NBB- x CT ceramics exhibit a typical single perovskite phase structure. The results indicate that the NBB-15CT ceramics showed a high energy density of 3.14 J/cm 3 at 250 kV/cm. The piezoresponse force microscopy (PFM) results showed that the addition of CT broke the macrodomains of the 0.98Na 0.5 Bi 0.5 TiO 3 -0.01BaTiO 3 -0.01BiFeO 3 ceramic and helped to form nanodomains, leading to an improved energy storage performance. The above performance indicates that the specimens possess very good temperature-and frequency-dependent energy storage performances at 30–150 °C and 1–100 Hz. Moreover, the electric energy storage and release in the NBB-15CT ceramic indicated that the power density could reach 55.30 MV/cm 3 at 180 kV/cm. Therefore, the NBB-15CT ceramic is a promising material for electrical capacitors.
研究领域:
材料科学
·
物理学
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Tengfei Yu,Rongrong Chen,Xiang Ji,Zhijun Fu,Subing Jiang,Meizhen Gao
In this study, we investigated the phase structure, Curie temperature, dielectric properties, piezoelectricity, and energy-storage properties of BiFeO 3 (BFO)-modified (Ba 0.95 Ca 0.05 ) (Ti 0.89 Sn 0.11 )O 3 (BCTSO) ceramics using both experimental and theoretical methods. The results indicated that the lattice distortion and chaotic distribution of the local charge increased with the BFO content, resulting in a phase transition and transformation from a ferroelectric to a relaxing ferroelectric. First-principles calculations revealed that the Curie temperature decreased with increasing BFO content, primarily because of an increase in the ground state energy. The variation in the permittivity of the BCTSO- x BFO ceramics with temperature and frequency is affected by the phase structure and Maxwell-Wagner interface polarisation, respectively. The electrical modulus measurements indicated that BCTSO- x BFO exhibited non-Debye-type dielectric relaxation for x = 0.0, 0.1, and 0.5 %, whereas BCTSO- x BFO showed Debye-type dielectric relaxation for x = 0.9%.
研究领域:
材料科学
·
物理学
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CERAMICS INTERNATIONAL
·
2026
·
IF 6
Xihao Wang,Lihong Bai,Mengru Ge,Pengyu Wang,Juan Liu
To investigate the synergistic effects of multi-element rare-earth doping in BiFeO 3 ceramics, this study prepared a series of co-doped samples. A comparative analysis was conducted, focusing on the differences in crystal structure, microstructure, and multiferroic properties between the co-doped samples and their singly-doped counterparts. Structural analysis confirms that the concentration and ionic radius of the rare-earth dopants are critical factors inducing the transition of the primary phase from rhombohedral R 3 c to orthorhombic Pna 2 1 , a process often accompanied by multi-phase coexistence. Specifically, a smaller rare-earth ionic radius (Sm-doped BiFeO 3 ) leads to a superior magnetic properties, where remanent magnetization M r = 74.5 emu/mol, but poorer ferroelectric performance, with the remanent polarization P r = 4.41 μC/cm 2 . In contrast, a larger ionic radius (La-doped BiFeO 3 ) enhances the ferroelectric properties ( P r = 38.08 μC/cm 2 ), although the magnetic performance remains suboptimal ( M r = 20.45 emu/mol). Specifically, the multi-doped Bi 0.82 (La 1/3 Nd 1/3 Sm 1/3 ) 0.18 FeO 3 (LNS018) ceramic achieved a remarkable remanent polarization ( P r ) of 40.90 μC/cm 2 under 170 kV/cm, which is superior to its single-doped counterparts. Concurrently, its remanent magnetization ( M r ) reached 39.8 emu/mol. This superior performance is attributed to the construction of a morphotropic phase boundary between the R 3 c and Pna 2 1 phases, which was effectively tailored by the multi-substitution strategy. Compared to single rare-earth substitution, co-doping induces greater lattice distortion and more refined domain structures, contributing to the enhanced multiferroic performance.
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CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 23
·40067-40078
·
IF 5.6
Meng Wang,Ting Wang
BiFeO 3 -BaTiO 3 exhibits a high dielectric constant , excellent ferroelectric properties, and mechanical stability , making it a promising material for energy storage applications . However, unmodified BiFeO 3 -BaTiO 3 ceramics typically exhibit high residual polarization and low breakdown strength , resulting in low energy storage density and efficiency. In this study, (1- x )(0.67BiFeO 3 -0.33BaTiO 3 )- x (Sr 0.7 Nd 0.2 )TiO 3 ceramics were prepared and demonstrated a pseudo-cubic perovskite structure at room temperature. As the x value increased, the long-range ordered ferroelectric structure was disrupted, the relaxation characteristics were enhanced, and the grain size decreased significantly. The maximum polarization strength (P max ) of the composition with x = 0.15 reached 38.57 μC/cm 2 at 180 kV/cm. Under low electric fields, this material achieved an excellent recoverable energy storage density (W rec ) of 2.57 J/cm 3 and a high energy storage efficiency (η) of 79 %, while also exhibiting good frequency stability and charge/discharge performance. These characteristics suggest its potential application as a next-generation electrostatic capacitor material.
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Food Analytical Methods
·
2026
·Vol. 19
·期 2
·112
·
IF 3
Tang Tingting,Chen Ziyi,Chen Shu,Zhang Peisheng,Zeng Rongjin,Hao Yuanqiang
This study developed and validated a photoelectrochemical (PEC) platform for hydrogen sulfide (H 2 S) analysis in alcoholic beverages by electrodepositing/annealing dense BiFeO 3 films on FTO and converting them in situ into BiFeO 3 /Bi 2 S 3 heterojunctions. Phase formation and elemental redistribution were verified by XRD, SEM/EDS, and XPS; UV–vis/Tauc and Mott–Schottky supported broadened visible absorption and a direct Z-scheme alignment, while EIS revealed a markedly lowered interfacial charge-transfer resistance. Under optimized conditions, the sensor delivered a linear range of 0.1‒100 μM with an LOD of 36 nM, along with good selectivity against common anions and thiol-bearing interferents and excellent cycling photostability. In real matrices, standard additions achieved recoveries of 99.2%‒103.5% in water; beer and red wine contained 1–2 μmol·L ‒1 H 2 S with 94.5%‒106.5% recoveries. These results demonstrated that in situ chemical conversion coupled with Z-scheme interfacial engineering offers a simple, robust, and general route to rapid, sensitive, and matrix-tolerant PEC monitoring of H 2 S in complex fermented beverages.
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