POLYMER COMPOSITES
·
2023
·Vol. 44
·期 5
·2757-2765
·
IF 5.2
Linyu Pu,Yu Li,Jingyuan Tang,Yiting Long,Wei Wang,Yatang Dai,Xu Huang
Firstly, the BaTiO 3 nanoparticles were coated with a layer of paraffin, forming a core shell structure. Then, as-prepared paraffin@BaTiO 3 nanofillers were directly blended with polyimide (PI) prepolymer to fabricate paraffin@BaTiO 3 /PI composite films. The microstructure, thermal, and dielectric properties were investigated in detail. The surface-modified paraffin@BaTiO 3 nanoparticles exhibited a typical core shell structure with uniform and complete coverage. The char yield of the composite film with 10 wt% paraffin@BaTiO 3 increased from 56.40% to 70.73%. It is obvious that the paraffin@BaTiO 3 nanofillers have a positive effect on ablative performance of the composite film. Compared with pure PI, the ε r of paraffin@BaTiO 3 /PI composites with 40% mass fraction increased from 3.41 to 9.35 (1 kHz). The tanδ of paraffin@BaTiO 3 /PI composites was just 0.0065 (1 kHz) when the filler loading was 40 wt%. Temperature dependency of the permittivity of the composites reveals a zero-temperature-coefficient from 80°C to 180°C.
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
Journal of Energy Chemistry
·
2025
·
IF 14.9
Kanghou Ma,Caiyue Sun,Yitao He,Xinyue Zhao,Sunfa Wang,Ge Zhang,Chen Wang,Fangshuo Zhou,Zhiguo Liu,Zhe Lü,Xiqiang Huang,Ningning Wu,Yaohui Zhang
This study presents a novel approach to enhance silicon anode performance through barium titanate (BTO) incorporation, with the establishment of a force-electric coupling model. By introducing piezoelectric BTO into silicon matrices, we successfully improved both the mechanical stability and electrochemical kinetics of the anode. The developed force-electric coupling model explains how BTO mitigates stress accumulation during lithiation while optimizing the kinetics of Li + and electron transfer. Experimental verification and multiphysical simulation indicate that Si@BTO effectively eliminates structural degradation during the cycling process and significantly reduces the charge transfer resistance. The force-electric coupling mechanism further facilitates stable solid electrolyte interphase (SEI) formation. When paired with LiFePO 4 cathodes, Si@BTO maintains 76% capacity retention after 500 cycles at a 10 C rate. This work establishes a basic force-electric coupling model framework and offers insights into the development of advanced silicon anode batteries with exceptional performance.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Junyu Wang,Jiangnan Guo,Qinggang Zhou,Yuejin Zhu,Qizhi Liu,Shuozhen Hu,Xinsheng Zhang
Formic acid is a desirable liquid hydrogen storage compound for solving transport and storage problems of hydrogen for onboard fuel cells. Optimizing adsorption/desorption energy of intermediates can directly modulate the performance of Pd catalysts in formic acid dehydrogenation (FAD). Herein, we introduce internal electric field with controllable strength to regulate the adsorption/desorption of intermediates on Pd. Non-ferroelectric cubic-phase barium titanate (CBT) is heat-treated at high temperature to obtain ferroelectric tetragonal-phase barium titanate (TBT(C)), which exhibits internal electric field. The strength of the internal electric field is successfully adjusted by heat treatment at different temperatures. The size of Pd nanoparticles is restricted between 2.2 and 2.7 nm, and the electronic effect of Pd is effectively eliminated by coating TBT(C) with mesoporous carbon shell (TBT(C)@SC). Experimental results prove that the internal electric field promotes the desorption of hydrogen on Pd. Pd/TBT(C)@SC-800 obtained by heat treatment at 800 °C, with the optimal internal electric field strength, exhibits high activity and hydrogen selectivity for FAD. This work provides a new strategy for designing FAD catalysts.
研究领域:
化学
·
材料科学
·
催化反应
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Penghao Hu,Zhuye Jia,Zhonghui Shen,Peng Wang,Xiaoru Liu
To realize application in high-capacity capacitors and portable electric devices, large energy density is eagerly desired for polymer-based nanocomposite. The core–shell structured nanofillers with inorganic buffer layer are recently supposed to be promising in improving the dielectric property of polymer nanocomposite. In this work, core–shell structured TO@BT nanoparticles with crystalline TiO 2 buffer layer coated on BaTiO 3 nanoparticle were fabricated via solution method and heat treatment. The thickness of the TO buffer layer can be tailored by modulating the additive amount of the titanate coupling agent in preparation process, and the apparent dielectric properties of nanocomposite are much related to the thickness of the TO layer. The relatively thin TO layer prefer to generate high polarization to increase dielectric constant while the relatively thick TO layer would rather to homogenize field to maintain breakdown strength. Simulation of electric field distribution in the interfacial region reveals the improving effect of the TO buffer layer on the dielectric properties of nanocomposite which accords with the experimental results well. The optimized nanoparticle TO@BT-2 with a mean thickness of 3–5 nm buffer layer of TO is effective in increasing both the ε and E b in the PVDF composite film. The maximal discharged energy density of 8.78 J/cm 3 with high energy efficiency above 0.6 is obtained in TO@BT-2/PVDF nanocomposite with 2.5 vol% loading close to the breakdown strength of 380 kV/mm. The present study demonstrates the approach to optimize the structure of core–shell nanoparticles by modulating buffer layer and provides a new way to further enlarge energy density in polymer nanocomposite.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 37
·50943
·
IF 3.125
Rui Wang,Congzhen Xie,Bin Gou,Huasong Xu,Shoukang Luo,Yan Du,Jiangang Zhou,Hao Yang
Flexible nanocomposite dielectrics with high dielectric constant and discharge energy density have broad application prospects in the field of energy storage. However, dielectrics with high dielectric constant tend to have a high dielectric loss. Herein, we prepared a dielectric composite material with ultra-high discharge energy density by modifying the interface between nanoparticles and poly(vinylidene fluoride-co-hexafluoropropylene) (P[VDF-HFP]). After coating a shell of insulating amorphous SiO 2 (~7 nm) outside the barium titanate (BT), the electric field concentration and current density inside BT particles can be significantly reduced. In addition, coating the SiO 2 shell with a polydopamine (PDA) shell (~7 nm) not only enhances the interface interaction between the nanoparticles and the polymer matrix, but also can form lots of microcapacitors in the composite. As a result, an ultra-high discharge energy density of 13.78 J/cm 3 at the expense of relatively inconspicuous efficiency (~59.8%) in the BT@SiO 2 @PDA/P (VDF-HFP) with 2.5 wt% loading has been achieved under 460 kV/mm. This is mainly attributed to the increases of dielectric constant from 12.1 to 14.2 and the relatively low dielectric loss (0.086) at 100 Hz. Moreover, compared with the pure P (VDF-HFP) (400 kV/mm), the breakdown voltage of the composite with 2.5 wt% loading is surged to 460 kV/mm, which benefited from the hindrance of nanoparticles on carrier migration at low content. This work has realized a thin-film dielectric with ultra-high discharge energy density through a novel design of the nanoparticle structure, providing a theoretical direction for the development of polymer dielectric capacitors.
研究领域:
材料科学
·
能源存储
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Jing-hui Yang,Xu Xie,Zhen-zhen He,Yu Lu,Xiao-dong Qi,Yong Wang
Dielectric composites with low dielectric loss recently attract increasing concerns of researchers due to the great potential applications in microelectronic devices. In this work, novel hybrid particles, which were composed of barium titanate (BaTiO 3 ), polypyrrole (PPy) and graphene oxide (GO), were prepared through the in situ polymerization of PPy on the surface of BaTiO 3 particles and the deposition of BaTiO 3 @PPy particles on the surface of the GO platelets. Morphology and microstructure characterizations showed that the ‘core–shell’-like BaTiO 3 @PPy particles were prepared and these particles exhibited homogeneous dispersion on the GO platelets. Then, two kinds of poly(vinylidene fluoride) (PVDF)-based composites, including PVDF/BaTiO 3 @PPy and PVDF/BaTiO 3 @PPy-GO, were fabricated. Different from the relatively homogenous dispersion of BaTiO 3 @PPy particles in the whole PVDF/BaTiO 3 @PPy composites, the BaTiO 3 @PPy-GO particles exhibited slight aggregation in the PVDF/BaTiO 3 @PPy-GO composites due to the GO-induced local aggregation of BaTiO 3 @PPy particles. The two kinds of particles exhibited good nucleation effect and mainly promoted the crystallization of α-form PVDF. Electrical conductivity and dielectric property measurements showed that the PVDF/BaTiO 3 @PPy-GO composites had lower electrical conductivity, smaller dielectric loss but higher breakdown strength compared with the PVDF/BaTiO 3 @PPy composites. The mechanism was mainly attributed to the presence of GO platelets, which restricted the formation of the conductive path in the 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
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Yufei Tang,Cong Wu,Ping Zhang,Kang Zhao,Zixiang Wu
A sintering-free magnesium phosphate cement (MPC) with an arbitrary shape is potentially used as a bone implant material , especially with complex shapes. However, the high degradation rate of MPC may lead to the degradation of mechanical properties . In this study, graphene (G)/barium titanate (BT)/MPC composites were fabricated by introducing the piezoelectric phase BT and conductive phase G into MPC, which exhibited the piezoelectric effect after polarisation. The negative surface of the composite may attract Ca 2+ and Mg 2+ to mineralise rapidly, thereby reducing and improving its degradation rate and mechanical properties, respectively. The contents of additional G and BT were optimised. When BT and G contents were 50 mol% and 0.5 wt%, respectively, the piezoelectric coefficient of the composites increased to 6.31 pC/N, which is an increase of 421% without the addition of G. The results of in vitro degradation and mineralisation in simulated body fluids (SBF) showed that introducing BT and G could effectively slow down the degradation rate, promote mineralisation on the composite surface, and enhance the impact on bone integration.
研究领域:
生物材料学
·
医学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Licheng Wan,Jun Han,Wenrou Tian,Najun Li,Dongyun Chen,Jianmei Lu
Both large adsorption capacity and high catalytic activity play a key role in water purification via effective degradation of organic pollutants. Herein, a well-defined core–shell heterostructure (BTO@TD-COF) was fabricated by polycondensation of 1,3,5-tris(4-aminophenyl)benzene and 2,5-dimethoxyterephaldehyde on barium titanate (BTO) for effective adsorption that is followed by the piezo-photocatalytic degradation of bisphenol A in water. Under simultaneous ultrasound and visible-light irradiation, the separation of carriers is boosted by the built-in electric field generated in BTO, which endows BTO@TD-COF with outstanding piezo-photocatalytic activity. With the advantages of favorable catalytic and adsorption performance, Bisphenol A (5 ppm, 1000 mL) can be completely degraded within 75 min by BTO-3@TD-COF (25 mg), and the degradation rate is 31.9 and 2.5 times that of BTO and TD-COF, respectively. It provides an efficient strategy for cleaning of organic wastewater by piezo-photocatalysts combined with excellent adsorption capacity.
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
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Jingfeng Liu,Jintao Liu,Xuan Zhang,Xingang Liu,Chuhong Zhang
Piezoelectric energy harvesters (PEHs) with porous structures, such as piezoelectric elastic sponges, exhibit high force-to-electricity conversion efficiencies owing to their excellent compression recovery properties. However, conventional preparation methods are limited to producing bulk-form sponge-like PEHs and fail to create more elaborate three-dimensional (3D) structures that could enhance conversion efficiency. Herein, we invent a composite ink consisting of waterborne polyurethane (WPU), barium titanate (BTO), and cellulose nanofibers (CNFs) that is suitable for direct ink writing (DIW) 3D printing. This ink, when coupled with freeze-drying, allows the customization of piezoelectric sponges with functional 3D structures. The printed lattice sponge exhibits remarkable compression recovery of 70% and a notably high relative sensitivity of 9.83 mV/kPa*wt % (where *wt % denotes the BTO content) across a wide pressure range of 2.98–37 kPa, which is approximately three times broader than those of other composite piezoelectric pressure sensors based on BTO or piezoceramic (PZT) materials. Furthermore, a customized 3D piezoelectric sponge with a “boomerang” configuration is utilized as an anisotropic bending sensor on the wrist for intelligently monitoring the stroke posture and programming scientific training for table tennis players. This study highlights a versatile strategy for constructing elastic sponges with high piezoelectricity and designing 3D PEH functional structures that can be applied to flexible self-powered intelligent sensing systems.
研究领域:
材料科学
·
智能系统
·
传感器技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 10
·5758-5765
·
IF 3.119
Jie Tao,Shun-an Cao,Rui Feng,Yulin Deng
A series of composite films based on tetragonal barium titanate (BTO) and cellulose nanofibrils (CNF) with high dielectric constant are prepared using a casting method in aqueous solution. No organic solvent is involved during the preparation, which demonstrates the environmental friendliness of the novel material. With less than 30 wt% of filler loading, the excellent distribution of BTO nanoparticles within the CNF matrix is revealed by the FE-SEM images. The dielectric constant of the CNF/BTO (30 wt%) composite film reaches up to 188.03, which is about seven times higher than that of pure CNF (25.24), while the loss tangent only rises slightly from 0.70 to 1.21 (at 1 kHz). The thin films kept their dielectric properties on an acceptable level after repeatedly twisting or rolling 10 times. The improvement of thermal stability is observed with the presence of BTO. The outstanding dielectric properties of the CNF/BTO composite film indicates its great potential to be utilized in energy storage applications.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS & DESIGN
·
2018
·
IF 4.525
Jiachen Ma,Umair Azhar,Chuanyong Zong,Yabin Zhang,Anhou Xu,Congcong Zhai,Luqing Zhang,Shuxiang Zhang
The design of core-shell structure is considered as a facile approach to obtain polymer composites with excellent dielectric properties and high breakdown strength (E b ). In this work, thiol-terminated poly(vinylidene fluoride) (PVDF-SH) and polystyrene (PS-SH) are synthesized by a two-step process. The as-prepared polymers are applied to modify BaTiO 3 (BT) nanoparticles . The subsequent morphologies, dielectric properties, and E b of PVDF-based composites are investigated systematically. PVDF encapsulated BT (PVDF@BT) fillers carries more desirable compatibility with matrix compared with PS encapsulated BT (PS@BT) and raw BT. For instance, the E b of the 30 vol% PVDF@BT composites slightly decreased from 150.6 to 117 kV/mm for PVDF matrix, as compared to the raw and PS@BT composites, for those the values intensively reduced to 58.5 kV/mm and 107 kV/mm, respectively. It is also observed that PVDF polymer shells play a significant role in the improvement of composites dielectric constant (ε r ). Moreover, the design of the polymer shell also contributes to the suppression of dielectric loss. The results are of great importance for understanding the effect of polymer shells and fluorinated filler on composite properties. This study provides a strategy for preparing composites with high ε r while maintaining high E b for the next generation of dielectric capacitors.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 22
·5655
·
IF 3.1
Tianyu Hao,Jing Shen,Qiaochu Peng,Jie Liu,Wenbin Hu,Cheng Zhong
This study successfully synthesized high-tetragonality barium titanate (BaTiO3) particles with a small particle size by implementing ball milling in the solid-state synthesis of BaTiO3and utilizing nanoscale raw materials. This study also addressed the issues of impurities and uneven particle size distribution that could exist in the synthesized BaTiO3particles. The crystal structure, morphology, and particle size of the synthesized BaTiO3particles have been meticulously analyzed and discussed through the use of techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), and the laser particle size analyzer. BaTiO3has been successfully synthesized, exhibiting a uniform particle size with an average diameter of 170 nm and a high tetragonality value of 1.01022. This new solid-state synthesis method provided insights to avoid the impact of “size effects” during the process of electronic device miniaturization.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）