AUSTRALIAN JOURNAL OF CHEMISTRY
·
2018
·Vol. 71
·期 12
·965-970
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IF 1.059
Lingfeng Ruan,Rongying Jiang,Jing Liu,Song Liu
BaTiO3/TiO2 and CaTiO3/TiO2 bilayer-type photocatalyst films have been prepared and characterised by X-ray diffraction, Raman, X-ray photoelectron spectroscopy, UV-vis, and scanning electron microscopy techniques. The photodeposition of silver was done to confirm the reduction positions of the titanate/TiO2 films. Silver deposited preferentially on the side of TiO2 for BaTiO3/TiO2 whereas on the side of CaTiO3 for CaTiO3/TiO2. These results imply that the direction of photogenerated electron transfer is coincident with the semiconductor physical principles. Upon exposure to light, electron–hole pairs are generated and subsequently separated by an internal electrostatic field in the titanate–TiO2 heterojunction.
研究领域:
材料科学
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物理化学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Ziwei Zhao,Qi Ling,Ziliang Li,Kui Yan,Chunsheng Ding,Peng Chen,Lei Yang,Zhaoqi Sun,Miao Zhang
The combination of light energy and mechanical energy is thought to be an effective way to manage environmental resources and create sustainable energy. In this study, thin-film catalysts compounded with photocatalytic material TiO 2 and piezoelectric material BaTiO 3 were successfully prepared by a simple hydrothermal method on glass sheets, avoiding the possibility of secondary contamination of powder catalysts. The synergistic effect of light and ultrasound enhanced the degradation of norfloxacin by heterojunction BaTiO 3 /TiO 2 . After 60 min, the norfloxacin degradation was 91.7 % complete, with a rate constant of 43 × 10 −3 min −1 . This rate constant was 2.69 times higher than the rate constant for TiO 2 at 16 × 10 −3 min −1 . The built-in electric field generated by ultrasound is thought to improve the catalytic and optoelectronic properties of the composite by separating photogenerated electrons and holes. In addition, the stability and general usability of the composites were investigated. The effects of norfloxacin concentration, solution pH, and anions on the experiments were also analyzed. Free radical trapping experiments were conducted on the composites to identify the active species. The results showed that h + and ·OH were the main active species. In addition, it was determined that S-Scheme heterojunctions were likely involved in the catalytic process.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Lu Yang,Xi Chen,Jingxiang Zhang,Haoliang Zhang,Qiuying Zhao,Haiyan He,Huajie Huang,Yanjie Wang
High-efficient and recyclable piezo-photocatalysts are garnering substantial attention in line with the advancements in environmental purification. Herein, a novel micropatterned piezo-photocatalytic composite film, wherein BaTiO 3 @TiO 2 core-shell nanoparticles are embedded within porous poly(vinylidene fluoride) matrix, is developed. The impressive synergy between photocatalytic and dual piezocatalytic effects emanating from integrated components contributes to significantly amplified piezo-photocatalysis process. Moreover, by modulating the geometric structure of nanofiller along with topographical pattern design, one can further harness the piezo-photocatalysis effect upon electrical poling. As a result, the newly-developed composite film exhibits distinguished piezophotocatalytic activity, i.e., the degradation efficiency of highly-concentrated Methyl Orange (MO) solution (C 0 = 10 mg/L, 100 mL) reaches 97.3 % within 90 min, implying its viability as high-performance piezo-photocatalysts.
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
Nano Energy
·
2020
·
IF 16.602
Jieru Wu,Wenwei Wang,Yao Tian,Chunxiao Song,Hong Qiu,Hao Xue
The effective separation of photo-generated electrons and holes is an important factor that determines the photocatalytic efficiency of the catalysts. Here, we propose a core/shell BaTiO 3 /TiO 2 nanocomposites that present enhanced photocatalytic performance through a piezotronic effect. The polarization generated by the piezoelectric phase in the BaTiO 3 /TiO 2 nanofibers prepared by the electrospinning method under ultrasonic activation dramatically improves the photocatalytic performance of the catalysts. Under the co-excitation of ultrasonic and ultraviolet irradiation, the oxidation rate constant of the polarized BaTiO 3 /TiO 2 nanofibers on RhB dye can reach 9.67 × 10 −2 min −1 , which is 3.51 times and 3.22 times of the corresponding values of TiO 2 nanofibers and BaTiO 3 /TiO 2 nanofibers under only UV irradiation, respectively. This paper provides a promising strategy for improving photocatalytic performance through mechanical vibration and helps to understand the coupling mechanism between piezoelectric and photocatalytic effects.
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 Materials Chemistry A
·
2017
·Vol. 5
·期 29
·15217-15226
·
IF 8.867
Zhongbin Pan,Jiwei Zhai,Bo Shen
Polymer nanocomposites with high energy density have potential applications in advanced electronics and electric power systems. The inevitable electrical mismatch between nanofillers and the polymer matrix could compromise the energy storage capability and dielectric properties of the polymer nanocomposites. Herein, novel core–double-shell structured BaTiO3@TiO2@Al2O3 nanofibers (BT@TO@AO NFs) were prepared via a one step method, and were incorporated into poly(vinylidene fluoride) (PVDF). The novel design of gradually varying the multilayer hierarchical interface was advantageous to alleviating the local electric field and electric current density intensification in the filler/polymer system. As compared with the nanocomposites loaded with BT NFs and BT@TO NFs, the nanocomposites filled with BT@TO@AO NFs exhibit much decreased dielectric loss, enhanced breakdown strength, and suppressed leakage current densities. Simulations were carried out to verify that the new core–double-shell structure significantly enhances the breakdown strength and energy density. As a result, the nanocomposite films loaded with 3.6 vol% BT@TO@AO NFs show a maximum energy storage density (Ue) of 14.84 J cm−3 at 450 MV m−1, which is about twelve times greater than that of biaxially oriented polypropylene (BOPP) (≈1.2 J cm−3 at 640 MV m−1). Moreover, the nanocomposite exhibits a superior power density of 4.7 MW cm−3 and an ultra-fast discharge speed of 0.37 μs. This research opens up a convenient and effective way for designing high-performance dielectric polymer nanocomposites.
研究领域:
材料科学
·
电气工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Zhaowei Liu,Kang Zhao,Guoxin Xing,Wanxing Zheng,Yufei Tang
Piezo-photocatalysis materials that can effectively utilize mechanical energy of water flow have become one of the research focuses in the field of water pollutant treatment. Herein, the unique thorn-like BaTiO 3 –TiO 2 composite nanofibers were prepared in one step by coaxial electrospinning. The surface TiO 2 nanorods and the core BaTiO 3 nanofiber presented a certain angle when the advancing speed ratio of the shell and core solution was 2:1. The TiO 2 nanorods were tightly bonded to the nanofiber and the thorn-like protrusions on the fiber surface were sensitive to water flow. The BaTiO 3 –TiO 2 composite nanofibers exhibited excellent photocatalytic performance and recyclability with the bandgap value of 3.12 eV. The photocatalytic degradation rate of BaTiO 3 –TiO 2 composite nanofibers was 99.8% under the vibration of tiny water current, while the degradation rate was just 56.1% without vibration. Scavenger study result indicated that superoxide radicals and hydroxyl radicals were the main factors to improve the photodegradation activity of the samples. After five cycles, the degradation rate still reached 98.6%. The obtained thorn-like BaTiO 3 –TiO 2 composite nanofibers can effectively utilize the tiny water vibration energy and have broad application prospects in the field of water treatment. Most importantly, the method of synthesizing a unique thorn-like structure is universal.
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
MATERIALS & DESIGN
·
2020
·
IF 6.289
Yanan Hao,Zunpeng Feng,Zhengda He,Jiameng Zhang,Xiaoming Liu,Jing Qin,Limin Guo,Ke Bi
Dielectric capacitors are key devices in pulsed power systems for their high power density. To improve the energy density, compact nanocomposite films comprising PVDF polymer and core-shell BaTiO 3 @TiO 2 nanoparticles are prepared, in which the BaTiO 3 ( d ~ 8 nm) nanoparticles are encapsulated by the amorphous TiO 2 shell layer. Compared to the conventional BaTiO 3 /PVDF nanocomposite, the BaTiO 3 @TiO 2 /PVDF nanocomposite in this report takes advantage of the small particle size and the gradient dielectric design of the interface, which enhances the electric displacement as high as 65% and the breakdown strength of 20% simultaneously. A maximal discharged energy density of 11.34 J·cm −3 is achieved under an electric field of 420 kV·mm −1 in the nanocomposite film containing 5 vol% BaTiO 3 @10 wt%TiO 2 . Therefore, the gradient design of ultrasmall dielectric nanofillers shows high potential in fabrication of high energy-density nanocomposite.
研究领域:
材料科学
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电气工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2022
·
IF 9.463
Fan Wang,Hang Luo,Di Zhai,Zhida Xiao,Li Zeng,Xueying Wang,Zhitao Hu,Huan Wang,Lihong Liu,Dou Zhang
Dielectric capacitors consisting of ceramic/polymer nanocomposites have been widely used in electrical and electronic fields due to the advantages of high power density, high stability and improved energy density . However, the mismatching of dielectric constant between ceramics and polymers seriously limits the improvement of energy density of dielectric capacitors. In this work, a novel kind of core-double shell structured ceramic filler BaTiO 3 @TiO 2 @SiO 2 (BT@TO@SO) is prepared by a two-step hydrolysis method and introduced into PVDF for high performance dielectrics. This core-double shell structured filler forms multi-layer interface with gradually reduced dielectric constants of BT, TO, and SO, which is beneficial to enhance the interface polarization and reduce the electric field concentration caused by dielectric mismatch. In addition, the high insulating properties of the outer layer of SO can greatly limit the electron migration and reduce the leakage current. The experimental results show that when the loading of BT@TO@SO filler is low, the nanocomposite can achieve an energy density of up to 19.7 J/cm 3 and an efficiency of 57.6% at 620 MV/m, which shows an obvious improvement compared with filling BT or BT@SO. The results of finite element analysis further verify the superiority of this core-double shell structure.
研究领域:
材料科学
·
电气工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Zhikun Li,Shasha Zhang,Ziyuan Li,Zhehao Zong,Hongbo Jiang,Yan Wang,Jingman Pang,Meijuan Tian,Weixing Zhao
Peroxymonosulfate (PMS), a strong oxidant with a redox potential of approximately 1.82 V, exhibits relatively low efficiency in the direct oxidation of pollutants; this has limited its further application in water pollution control. In this study, a plate-like BaTiO 3 /TiO 2 nanocomposite was successfully synthesized through hydrothermal and topochemical reactions. As an environmentally benign PMS activator, this nanocomposite effectively overcomes the limitations of single-component materials. In addition, the synergistic effect of light and ultrasound irradiation significantly enhances the efficiency of methyl orange degradation catalyzed by BaTiO 3 /TiO 2 . Systematic investigations of the influence of the BaTiO 3 /TiO 2 molar ratio show that the enhanced catalytic activity can be attributed to the formation of semiconductor heterojunctions, which not only strengthen the spontaneous polarization of ferroelectric BaTiO 3 but also facilitate the separation of photogenerated carriers and accelerate PMS activation. In summary, this study presents a novel strategy for PMS activation, providing a sustainable and efficient technological approach for wastewater treatment.
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产品关联
DOI
高影响因子
Materials Today Energy
·
2022
·
IF 9.257
Haoran Xie,Hang Luo,Zhantao Pei,Sheng Chen,Dou Zhang
With increased requirements from the miniaturization, lightweight and integration of electronic devices, it is urgent to improve the discharge energy density ( U e ) of commercial polypropylene (PP) film capacitor. In this work, core-shell structure BaTiO 3 @TiO 2 nanoparticles were introduced into polypropylene matrix via melt mixing method. Due to the existence of the transition layer, the addition of BaTiO 3 @TiO 2 nanoparticles can increase the interfacial polarization of the composites without causing obvious local electric field concentration in comparison with bare BaTiO 3 nanoparticles. Moreover, BaTiO 3 @TiO 2 nanoparticles can act as an electron trap to inhibit the movement of carriers and hinder the growth of the electrical tree, thereby promoting the breakdown strength ( E b ) of PP-based nanocomposites. As a result, the U e of the nanocomposite with 6 wt% BaTiO 3 @TiO 2 nanoparticles was improved from 4.28 J/cm 3 of pure PP to 5.58 J/cm 3 , maintaining a high efficiency of more than 95%. This study provides an effective strategy to optimize energy storage density of PP film capacitors.
研究领域:
材料科学
·
电气工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 5
·2667-2676
·
IF 2.779
Chen Jiajian,Deng Wei,Ren Yuanyuan,Qu Kexin,Li Guoan
Dielectric capacitor has been rapidly developed in recent years, and the ceramics nanofibers/polymer nanocomposites with improved dielectric properties have huge potential in exploitation and application. In this article, the barium titanate (BT) nanofibers were synthesized by electrospinning and encapsulated by titanium dioxide (TiO 2 ) via sol–gel method to prepare the core–shell structured BT@TiO 2 nanofibers and then utilized to prepare poly(vinylidene fluoride) (PVDF)-based nanocomposites. The study we have performed shows that the dielectric constant of BT@TiO 2 /PVDF composites with 4 vol% fillers increase to 24 at 1 kHz, accompanied with the low dielectric loss of 0.019. The breakdown strength of BT@TiO 2 /PVDF composites achieves 128 kV/mm at the content of 2 vol% BT@TiO 2 nanofibers, which is 150% of PVDF and 170% of BT/PVDF composites with the same content of fillers. Meanwhile, the tensile stress of BT@TiO 2 /PVDF composites also reaches the highest value of 44.01 MPa with 2 vol% fillers. In addition, the initial thermal decomposition temperature decreases with the increasing of BT@TiO 2 nanofibers.
研究领域:
材料科学
·
电气工程
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产品关联
DOI
高影响因子
IONICS
·
2018
·Vol. 24
·期 12
·3975-3982
·
IF 2.347
Wang Lu,Luo Hang,Zhou Xuefan,Wei Anqi,Zhou Kechao,Chen Zhuo,Zhang Dou
As the electronic industry developed rapidly, greater demands are required on the performance of dielectric composites, such as high permittivity, low dielectric loss, and high-energy density. Improving the compatibility of fillers in polymer matrix and uniform distribution of the electric field could increase the permittivity of such composites. Therefore, BaTiO 3 nanoparticles were coated by TiO 2 sol to fabricate BaTiO 3 @TiO 2 core-shell structured fillers in this paper. BaTiO 3 @TiO 2 fillers with gradient permittivity were firstly modified by dopamine in order to disperse in the composites homogeneously and adhere to poly(vinylidene fluoride- co -hexafluoropropylene) (P(VDF-HFP)) matrix tightly. At 1 kHz, the permittivity of the composite with 20 vol% BaTiO 3 @TiO 2 was 32.15, obviously larger than that of pure P(VDF-HFP) (6.92), and the dielectric loss was just 0.052. Consequently, the discharged energy density of the composite was enhanced to 0.23 J/cm 3 at 40 kV/mm, which was two times higher than that of pure P(VDF-HFP). This work provides a feasible approach to prepare high-performance dielectric composites.
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）