VACUUM
·
2021
·
IF 3.627
Dayi Jiao,Fuming Chen,Shaofeng Wang,Yinzhen Wang,Wei Li,Qinyu He
SnS 2 was hybridized with BaTiO 3 to form an efficient and cheap Z-scheme heterojuncted SnS 2 /BaTiO 3 photocatalyst by depositing nanosized SnS 2 on the surface of commercial micro-sized BaTiO 3 . Multiple characterization techniques have been employed to study the as-prepared samples. Scanning electron microscopy (SEM), transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM) results reveal that SnS 2 partly covers BaTiO 3 . The photoluminescence (PL) spectra and the electrochemical impedance spectroscopy (EIS) investigation exhibit that the heterojunction SnS 2 /BaTiO 3 has improved the separation and transfer of the photogenerated electron-hole pairs. UV–Vis-DRS and Mott-Schottky measurement give the estimated E g , E CB , and corresponding calculated E VB , which meet the requirements of Z-scheme. The photocatalytic efficiency (degradation is 98% within 20 min) has been greatly enhanced much higher than pure SnS 2 . Free radical trapping experiments indicates that superoxide (•O 2 − ) is the dominant active species of the reaction system. The improved photocatalytic performance, as well as the free radical trapping experiments support the Z-scheme mechanism for composite photocatalyst SnS 2 /BaTiO 3 . This work reveals that Z-scheme composite SnS 2 /BaTiO 3 has prospect in treating organic pollution in waste water.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 5
·5886-5897
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IF 2.478
Pu Linyu,Tang Jingyuan,Gu Xiaochun,Jin Tingting,Zeng Benlan,Liu Jingsong,Huang Xu
In this work, PI was chosen as polymer matrix, PI composite films embedded with BaTiO 3 were prepared by in-situ polymerization. BaTiO 3 nanofillers were modified with paraffin to form a core–shell structure in order to improve the dispersion and compatibility with PI matrix. The permittivity of paraffin@BT/PI composite films with 40 wt% filler loading increase to 8.0 (1 kHz), which is about 2.4 times higher than that of pristine PI. The composites show stable capacitance in the range of 80 to180 °C. The energy storage density of composites with 40 wt% filler loading is as high as 3.31 J cm −3 under 180 MV m −1 , which is 2.4 times higher than that of pristine PI (0.97 J cm −3 at 180 MV m −1 ). However, the charge–discharge efficiency is 29.03%, and the discharge energy density is only 0.96 J cm −3 at 180 MV m −1 . To weigh the pros and cons, the composites with 30 wt% filler loading exhibit a better energy storage property, with a η of 70.45% (180 MV m −1 ) and discharge energy density of 1.03 J cm −3 at 180 MV m −1 .
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CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Yanan Yin,Chenggang Zhang,Jisi Chen,Wenchao Yu,Zhuqun Shi,Chuanxi Xiong,Quanling Yang
Flexible electrostatic capacitors have many potential applications in modern electric power systems. In this study, flexible cellulose-based dielectric films were prepared by compositing regenerated cellulose (RC) and one-dimensional BaTiO 3 nanofiber (BTNF) via a simple and environmentally friendly process. To improve compatibility and distributional homogeneity of the fillers/matrix, BTNF was surface modified by dopamine to prepare the poly(dopamine) modified BTNF (PDA@BTNF). The obtained RC/PDA@BTNF composite films (RC-PDA@BTNF) possessed higher dielectric constant and breakdown strength than those of the RC and RC/BTNF composite films. In particular, RC/PDA@BTNF composite films with 2 vol% PDA@BTNF (RC-2PDA@BTNF) exhibited a high discharged energy density of 17.1 J/cm 3 at 520 MV/m, which exceeded 40 % compared with that of RC-2BTNF at 460 MV/m. Meanwhile, RC-2PDA@BTNF could continuously work for more than 10,000 times with a high efficiency of 91 %. Furthermore, the composite films could maintain good dielectric properties for a long time when stored in vacuum condition (under 0.3 atm). Therefore, these flexible cellulose-based dielectric materials are promising in the field of novel high-performance film dielectric capacitors.
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PubMed
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2020
·
IF 2.904
Jingjing Zeng,Jingyuan Tang,Tingting Jin,Linyu Pu,Xianhua Wei,Xu Huang,Jingsong Liu
The introduction of nano-sized BaTiO 3 (BT) into polymer host matrices brings about promising dielectric and energy storage properties. However, pristine BT tends to aggregate and is difficult to be compatible with polymer matrices, thus requiring surface modification of BT nanoparticles. In this work, γ -aminopropyl triethoxysilane (KH550) was grafted onto the surface of BT as a shell and amino-functionalized core-shell KH550@BT nanoparticles have been successfully prepared. Thereafter, poly(arylene ether nitrile) (PEN) has been chosen as polymer matrix due to its excellent thermal properties, and x KH550@BT/(1- x )PEN composite films were prepared by solution casting film formation method. The energy density of KH550@BT/PEN composites with 30 wt.% filler loading is 1.30 J cm −3 ( η = 61.32 %) at 150 MV m −1 , more than 36.84 % increase when compared with pristine PEN polymer (0.95 J cm −3 at 170 MV m −1 ). Temperature-dependent and frequency-dependent D–E loops confirmed that KH550@BT/PEN composites possess good temperature and frequency stability.
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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.
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CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Mengna Feng,Chunting Li,Meng He,Yumin Huang,Juhua Luo
Flexible, high- k and thermostability polymer-based dielectric composites are the core components in electrostatic capacitors and embedded devices. Herein, the dielectric polymer matrix composites are developed by embedding polydopamine (PDA)-encapsulated hydroxylated barium titanate (BTH) and molybdenum disulfide (MoS 2 ) into poly(arylene ether nitrile) (PEN) matrix. The MoS 2 /PDA@BTH-1 particles served as fillers are prepared by polydopamine deposition technology assisted with hydrogen bonding interactions. The introduction of PDA intermediate layer contributes to the construction of multiple interfaces and nanocapacitor networks, enhancing interfacial polarization. Based on this, the resulted dielectric composite with 15 wt% MoS 2 /PDA@BTH-1 loading exhibits the dielectric constant of 17.3 at 1 kHz, higher than that of 4.2 of PEN, while can maintain relatively low dielectric loss simultaneously. The possible mechanisms and synergistic enhancement effect of MoS 2 /PDA@BTH-1 particles on the dielectric properties of composites are also proposed. The results of permittivity-temperature stability show that the dielectric constant of PEN-based dielectric composites is stable when reaches 158 °C, indicating that the film can be used in capacitor at temperatures up to 150 °C, higher than that of most polymer capacitors. All in all, a feasible pathway is provided to design PEN-based dielectric composites with high- k to adopt the high-temperature environment in electrostatic capacitors and embedded devices.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
·
IF 10.9
Yuhua Ma,Xiadiye Aihemaiti,Kezhen Qi,Shiyin Wang,Yanjie Shi,Zhuanhu Wang,Minghe Gao,Fuhe Gai,Yulian Qiu
The S-scheme heterojunctions can effectively separate photogenerated electrons and holes, retain their high redox capacity, and provide great prospects for enhancing the photocatalytic activity of the composites in different fields. Herein, S-scheme heterojunction photocatalytic materials were rationally designed and prepared by a simple hydrothermal method between narrow-bandgap red phosphorus (HRP) and wide-bandgap BaTiO 3 (BTO) photocatalysts. Owing to the effective charge separation and redox ability from the S-scheme mechanism and oxygen vacancies, BTO/HRP exhibited good photoelectrochemical and photocatalytic degradation ability. Systematic photoreaction tests demonstrated that BTO/HRP had high practicality in the removal of pollutants from wastewater; its photodegradation rate of Rhodamine B reached 3.029 × 10 −1 min −1 in 12 min; and it could inactivate 1.8 × 10 9 CFU/mL of Escherichia. coli in 1 h, with an antibacterial rate of 99.8%. This paper provided a promising photocatalyst for pollutant removal and a new strategy for the fabrication of efficient RP-based photocatalytic materials.
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IET Nanodielectrics
·
2023
·Vol. 6
·期 3
·159-164
·
IF 2.7
Ming-Sheng Zheng,Wei-Wei Lu,Xing Yang,Zhi-Min Dang
The significant progresses of polymer-based nanocomposites with improved dielectric performances are urgently calling for an effect way to realise commercial production. Up to now, the biaxial stretching technology is still a powerful method to produce the high-performance dielectric films applied in the film capacitors due to its full-blown applications. In this work, a classical composite system of BaTiO 3 /polypropylene was applied to reveal the connection between the microstructure changes and dielectric properties of the corresponding nanocomposite films in the biaxial stretching process. The permittivity of BT-30 wt% nanocomposite reached 2.8 at 10 3 Hz after stretching, and its breakdown strength reached 340 MV/m. In addition, the breakdown strength of BT-10 wt% nanocomposite could even be promoted to 452 MV/m, which was 1.3 times higher than that before stretching. The microstructure test demonstrated that the rearrangement of nanofillers, high crystallinity and the oriented polypropylene crystals were advantageous to the improvement of breakdown strength for the stretched nanocomposite films. Therefore, the application of biaxial stretching technology into the preparation of nanocomposite dielectric film is an enormous potential way for the energy storage film capacitors.
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CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2023
·
IF 3.9
Huiqi Zheng,Xiaorong Meng,Yingzi Yang,Jin Chen,Shanshan Huo
The influence of surface charge density of nanofiltration (NF) membranes could due to enhanced electrostatic interaction through electrically assisted. In this study, the hydroxylated BaTiO 3 /Ti 3 C 2 T x (HBT)@polyvinyl alcohol (PVA) (HBTA) composite NF membranes were prepared by crosslinking HBT on the surfaces of NF membranes. The optimized HBTA-0.06 sample exhibited a water contact angle of 43.7°, zeta potential of −13.73 mV (pH = 6.5), average effective pore size of 0.319 nm, and pure water permeance of 55.1 L·m –2 ·h –1 . At an applied electric field of 3 V, the rejection rates of LiCl, NaCl, KCl, RbCl, and MgCl 2 determined for HBTA-0.06 reached 73.3%, 60.1%, 53.6%, 49.4%, and 59.8%, respectively. HBTA-0.06 has good stabilization properties that are especially advantageous for water purification , indicating good long-term filtration stability within 168 h. Furthermore, HBT doping significantly increased the charge density of the HBTA membranes and the rejection efficiency of chloride salts, both chlorine radicals (·Cl) and hydroxyl radicals (·OH) generation pathways were proposed under electrochemical assistance. Hence, electrical assistance represents a novel and effective technique for enhancing the salt rejection properties of multifunctional composite NF membranes.
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Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 14
·4614-4622
·
IF 6.4
Xingmin Liu,Jinling Tong,Jijie Wang,Shaowei Lu,Dongxu Yang,Hongmei Li,Chunzhong Liu,Yutong Song
Flexible piezoelectric pressure sensors have a great application prospect in wearable electronic products due to the advantages of low cost, fast response speed and a self-powered system. However, traditional films based on piezoelectric ceramic/polymer materials face problems such as poor dispersion and insufficient polarization, which hinder the piezoelectric performance of pressure sensors. In this work, MXene was introduced to modify the surface of barium titanate (BaTiO3), which was blended with poly(vinylidene fluoride-trifluoroethylene) (PVDF-TrFE) matrix. An electrospinning method was adapted to fabricate BaTiO3/MXene/PVDF-TrFE composite films. This work proposed a new microscopic sensing mechanism. In addition, this MXene-modification strategy could improve the dispersion of BaTiO3 into the PVDF-TrFE matrix, increase the polarization efficiency and enhance the piezoelectric performance of the sensors. The results showed that the composite film with 0.15 wt% MXene could achieve a remarkable output voltage of 7.6 V. In addition, the tensile strength of the composite film with 0.15 wt% MXene (20.8 MPa) was 77.8% higher than that without MXene (11.7 MPa). Meanwhile, the β phase content of the composite film could reach 81.04%, and the crystallinity increased from 39.49% to 50.31%. The fabricated piezoelectric pressure sensor had a wide detection range (0.2–400 kPa) and a short response time (56 ms). Besides, even after undergoing over 5000 compression cycles, it maintained a stable piezoelectric response. This pressure sensor could quickly respond to joint movements and strenuous exercises in humans. Therefore, this pressure sensor showed great advantages and potential in the application of human motion monitoring.
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RSC Advances
·
2019
·Vol. 9
·期 20
·11377-11384
·
IF 3.049
Kaili Wei,Baolai Wang,Jiamin Hu,Fuming Chen,Qing Hao,Guannan He,Yinzhen Wang,Wei Li,Junming Liu,Qinyu He
It's highly desired to design and fabricate an effective Z-scheme photo-catalyst with excellent charge transfer and separation, and a more negative conduction band edge (ECB) than O2/·O2− (−0.33 eV) and a more positive valence band edge (EVB) than ·OH/OH− (+2.27 eV) which provides high-energy redox radicals. Herein, we firstly designed and synthesized a core–shell-heterojunction-structured Z-scheme system BaTiO3@In2S3 (BT@IS, labelled as BTIS) through a hydrothermal method, where commercial BT was used as the core and In(NO3)3·xH2O together with thioacetamide as the precursor of IS was utilized as the shell material. In this system, the shell IS possesses a ECB of −0.76 eV and visible-light-response Eg of 1.92 eV, while the core BT possesses a EVB of 3.38 eV, which is well suited for a Z-scheme. It was found that the as-prepared BTIS possesses a higher photocatalytic degradation ability for methyl orange (MO) than commercial BT and the as-prepared IS fabricated by the same processing parameters as those of BTIS. Holes (h+) and superoxide radicals (·O2−) were found to be the dominant active species for BTIS. In this work, the core–shell structure has inhibited the production of ·OH because the shell IS has shielded the OH− from h+. It is assumed that if the structure of BTIS is a composite, not a core–shell structure, ·OH could be produced during photocatalysis, and therefore a higher photocatalytic efficiency would be obtained. This current work opens a new pathway for designing Z-scheme photocatalysts and offers new insight into the Z-scheme mechanism for applications in the field of photocatalysis.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 30
·期 3
·2501-2511
·
IF 2.324
Zhang Zhao,Yang Hui,Wang Hao,Ding Xingeng,Zhang Qilong,Zhu Zhicai
In this work, KTa 0.2 Nb 0.8 O 3 –BaTiO 3 (KTN–BT) hybrid nanoparticles were synthesized via a facile one-pot hydrothermal method. Flexible nanocomposite films comprised of poly (vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene) P(VDF-TrFE-CTFE) matrix and KTN–BT hybrid fillers of different molar ratio were prepared by solution-casting. It is revealed that the introduction of BT to the KTN causes decreased grain size and homogenous morphology, improving the dielectric constant, breakdown strengthen and energy density of nanocomposite films. Typically, the nanocomposite film containing 40 vol% KTN–BT possesses a dielectric constant of 322 at 100 Hz, which is 8.7 times than that of pure polymer. Also, nanocomposite film with < 10 vol% of filler could achieve high breakdown strength of over 300 MV m −1 . The energy density of the film containing 2 vol% KTN–BT filler is 61.4% higher than that of pure P(VDF-TrFE-CTFE) polymer. (7.1 J cm −3 compared to 4.4 J cm −3 .) In addition, the nanocomposites also displayed good flexibility and kept excellent dielectric properties after bending and folding. All the improved performance enables these composites to meet the requirements of many flexible electronic devices and energy storage devices.
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