ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Zheng Zhou,Zhao Zhang,Qilong Zhang,Hui Yang,Yulu Zhu,Yuanyu Wang,Lu Chen
Piezoelectric nanogenerators (PENGs), as a promising solution to harvest mechanical energy from ambient environment, have attracted much attention over the past decade. Here, the core–shell structured BaTiO3@Carbon (BT@C) nanoparticles (NPs) were synthesized by a simple surface-modifying method and then used to fabricate the efficient PENGs with poly[(vinylidene fluoride)-co-trifluoroethylene] (P(VDF-TrFE)). The carbon shell with the uniform thickness of 10–15 nm can increase the content of the polar β phase in P(VDF-TrFE) and significantly enhance the interfacial polarization between BT NPs and the polymer matrix during the poling process. Out of all compositions, the 15 wt % BT@C/P(VDF-TrFE) PENG exhibited the optimal piezoelectric performance with an output voltage of ∼17 V and a maximum power of 14.3 μW under bending–releasing mode. More importantly, the PENG can also efficiently harvest other types of mechanical energy from human activities and exhibits stable output after 1500 bending–releasing cycles. When the PENG was bent and beat by bicycle spokes, a peak voltage of 16 V was generated, which can light up 12 white LEDs directly and charge the commercial capacitors. Our research provides a new strategy to fabricate flexible and efficient PENGs from a nanoscale viewpoint; it can be hopefully applied in energy-harvesting systems and wearable electric sensors.
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DOI
PubMed
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2017
·
IF 4.873
Penghao Hu,Shengmin Gao,Yangyang Zhang,Liang Zhang,Chengchen Wang
Dielectric capacitors are promising in micro-electronics, portable equipment and hybrid electric vehicles due to their specific features of flexibility, ultrahigh operating voltage and fast charging-discharging rate. The dielectric properties of polymer-based nanocomposite are much related to the interface binding between fillers and matrix. In this work, a surface modification approach employed newfound titanate coupling agent was developed to improve the compatibility between BT nanoparticles and PVDF matrix. After treated by the modifier TC-2, a coating layer contained with active organic groups was formed on the surface of BT nanoparticles. Benefited from the improved dispersibility and compatibility of modified BT nanoparticles in PVDF matrix, the breakdown strength of the nanocomposites was much enhanced. The monodisperse mBT-2 nanoparticles treated with appropriate amount of modifier dramatically enlarged the breakdown strength from 397 kV/mm for neat PVDF to 517 kV/mm for 4 vol% mBT-2 loading nanocomposite. Compared with BT/PVDF, the improvements on the energy storage performance in mBT-2/PVDF are significant. The maximum discharged energy density of 11.27 J/cm 3 for 4 vol% loading mBT-2/PVDF is nearly double of that for 4 vol% loading BT/PVDF, and the energy efficiency for mBT-2/PVDF is also increased. The modification method originally represented here has great potential in developing high energy density nanocomposites for advanced applications.
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2017
·Vol. 29
·期 2
·1082-1092
·
IF 2.019
Li Yunming,Yang Wenhu,Ding Shanjun,Fu Xian-Zhu,Sun Rong,Liao Wei-Hsin,Wong Ching-Ping
High energy density polymer-based nanocomposites have shown significant potential in modern electronic devices. However, it is still a great challenge to achieve high dielectric permittivity and low dielectric loss without compromising breakdown strength. Here, we report a facile synthesis of core–shell structured BaTiO 3 @graphene oxide (BT@GO) hybrids as fillers for enhanced energy density of dielectric polymer nanocomposites. The as-fabricated BT@GO/PVDF nanocomposites manifest high dielectric permittivity and low dielectric loss, as well as highly enhanced breakdown strength and maximum energy density. The nanocomposites filled with 20 wt% BT@GO display a dielectric permittivity value of 14 and dielectric loss of 0.04 at 1 kHz with high breakdown strength of 210 MV/m. As a result, the maximum energy density up to 3.88 J/cm 3 , which is about 1.6 and 2.1 times higher than that of BT/PVDF nanocomposites with the same mass fraction and neat PVDF, respectively. These well tuned properties are resulted from the novel structure of BT@GO and synergistic effect of the two constituents, which GO shells as buffer layers could effectively mitigate local electric field concentration for enhanced breakdown strength and BT as cores raised the dielectric permittivity. This work provides a potential design strategy based on graphene oxide interface engineering for developing dielectric polymer nanocomposites with high energy density.
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DOI
高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 30
·10257-10265
·
IF 7.059
Liang Sun,Zhicheng Shi,Liang Liang,Shuang Wei,Huanlei Wang,Davoud Dastan,Kai Sun,Runhua Fan
Polymer dielectric composites are of considerable interest for film capacitors that are widely used in modern electric devices and electric power systems. However, the adverse coupling between dielectric permittivity (εr) and breakdown strength (Eb) makes it difficult to obtain high energy densities in natural materials. With the aim of achieving concurrently improved εr and Eb, a class of rationally designed layer-structured composites consisting of pure poly(vinylidene fluoride–hexafluoropropylene) (P(VDF–HFP)) layers and barium titanate/P(VDF–HFP) (BT/P(VDF–HFP)) composite layers were prepared. Interestingly, the layer-structured composites exhibit a concurrent improvement of εr and Eb. The 4-layer composite with 15 vol% BT exhibits substantially enhanced εr and Eb which are nearly ∼186% and ∼248% of those for its 1-layer counterpart, respectively. Consequently, a high energy density of ∼4 J cm−3 along with a satisfactory efficiency of 71% at 240 kV mm−1 is achieved. Meanwhile, a low loss tangent of ∼0.05 at 10 kHz which is comparable to that of pure P(VDF–HFP) is maintained. This work shows that the adverse coupling between εr and Eb in dielectric materials could be well addressed by constructing nanocomposites with layered rather than random distribution of fillers.
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Gang Chen,Xiaodong Peng,Chunlin Fu,Wei Cai,Rongli Gao,Peigeng Fan,Xin Yi,Hongqi Yang,Cong Ji,Hualei Yong
(0.95– x ) BaTiO 3 –0.05 BiYbO 3 – x BiFeO 3 ( x = 0, 0.01, 0.02, and 0.04) (abbreviated as (0.95– x ) BT–0.05 BY– x BFO) ceramics were fabricated by conventional sintering (CS) and microwave sintering (WS) methods. Effects of sintering method and BFO dopant on the microstructure and electric properties of (0.95– x ) BT–0.05 BY– x BFO ceramics were comparatively investigated. X-ray diffraction showed that all CS and WS samples presented a single perovskite phase. It was also found that WS ceramics possessed denser microstructure and finer grains compared to CS samples as indicated by the surface morphology characterization. Dielectric measurements revealed that all samples exhibited the weak relaxation behavior; however, the degree of relaxation behavior of BT–BY based ceramic could be strengthened by addition of BFO and by WS method. Moreover, the temperature and frequency stability could be improved with doped BFO. The density of 0.93BT–0.05BY–0.02BFO ceramic was found to be the largest while that of 0.94BT–0.05BY–0.01BFO ceramic was the smallest, thus, the dielectric constant of 0.93BT–0.05BY–0.02BFO was significantly larger than that of 0.94BT–0.05BY–0.01BFO and 0.94BT–0.05BY–0.04 BFO ceramics. minimum dielectric constant of (0.95– x ) BT–0.05 BY– x BFO ceramic was obtained at x = 0.01. Ferroelectric measurements indicated that all samples showed the slim hysteresis loop. The remnant polarization ( P r ) and coercive field ( E C ) of (0.95– x ) BT–0.05 BY– x BFO ceramics first decreased and then increased with increasing x ，the minimum values were obtained at x = 0.01. Moreover, P r and E C of WS ceramics were slightly larger than those of CS ceramics, indicating that higher density and larger grain sizes contributed to enhancing the ferroelectric characteristic. These findings indicate that addition of moderate amount of BFO and use of WS technique can strengthen the degree of relaxation behavior and improve the ferroelectric properties of BT–BY based ceramics.
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2015
·
IF 6.723
Hang Luo,Dou Zhang,Chao Jiang,Xi Yuan,Chao Chen,Kechao Zhou
Energy storage materials are urgently demanded in modern electric power supply and renewable energy systems. The introduction of inorganic fillers to polymer matrix represents a promising avenue for the development of high energy density storage materials, which combines the high dielectric constant of inorganic fillers with supernal dielectric strength of polymer matrix. However, agglomeration and phase separation of inorganic fillers in the polymer matrix remain the key barriers to promoting the practical applications of the composites for energy storage. Here, we developed a low-cost and environmentally friendly route to modifying BaTiO3 (BT) nanoparticles by a kind of water-soluble hydantoin epoxy resin. The modified BT nanoparticles exhibited homogeneous dispersion in the ferroelectric polymer poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-HFP)) matrix and strong interfacial adhesion with the polymer matrix. The dielectric constants of the nanocomposites increased significantly with the increase of the coated BT loading, while the dielectric loss of the nanocomposites was still as low as that of the pure P(VDF-HFP). The energy storage density of the nanocomposites was largely enhanced with the coated BT loading at the same electric field. The nanocomposite with 20 vol % BT exhibited an estimated maximum energy density of 8.13 J cm–3, which was much higher than that of pure P(VDF-HFP) and other dielectric polymers. The findings of this research could provide a feasible approach to produce high energy density materials for practical application in energy storage.
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Haiyan Wang,Linrui Bai,Shaolong Zhong,Qian Yang,Zhimin Dang
Dielectric capacitor is an important component of power systems , but its low dielectric polarization and undesirable dielectric loss have still held back the development of miniaturized microelectronic devices. Hence, we reported core@shell structured fillers with a conducting material@insulating material double-shell to improve the dielectric performance of the poly (vinylidene fluoride) (PVDF) composites. The hybrid fillers introducing ultra-short carbon nanotube (SSCNT) as an inner layer between BaTiO 3 (BT) as a core and silica (SiO 2 ) as an outer shell were synthesized. As the thickness of the insulating shell is enough thin, the BT@SSCNT@SiO 2 /PVDF composites exhibit an enhanced dielectric constant and a concurrently suppressed dielectric loss with the decreasing thickness. The composite incorporating the filler with the thinnest SiO 2 shell has the highest dielectric constant of 12.27 and the lowest dielectric loss of 0.023 at 20 wt% filler loading where the breakdown strength is about 15 less than the maximum value of 192.5 kV/mm. Furthermore, the hybrid fillers endow the composites with impressively stable dependence on frequency in a wide range of 10 2 ∼10 5 Hz. The achievement can be ascribed to the conducting property of the SSCNT inner layer and the suitable thickness of the insulating outer layer. They can synergetically provide the composites with an optimized polarization effect at a broad frequency resulting from the improved electrical field. This work reveals that a proper structure of the core@conducting material@insulating material core@double-shell filler can be an approach to optimize the overall dielectric performance of the polymer-based composites with high energy storage density .
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DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Zhourui Zhang,Xiong Huang,Jun Yang,Jianwei Zhao,Zhenxiao Fu,Xiuhua Cao,Lei Zhang,Shuhui Yu,Rong Sun
The addition of Mg generally enhances the high-temperature stability and reliability of BaTiO 3 -based multilayer ceramic capacitors (MLCCs). Herein, a series of Mg-doped BaTiO 3 -based ceramics and ultra-thin MLCCs were successfully fabricated, and the coherent and semi-coherent interface has been observed in samples. Based on the density functional theory (DFT) calculations, the improvement in temperature stability is due to changes in the coherent interface and electronic structure that promote the formation of polar nano-regions (PNRs) and induce relaxation behavior. Based on the atomic displacement, it is found that the excess substitution released the coherent stresses in the form of defects and formed semi-coherent interfaces. The reliability degradation of MLCCs is mainly due to the evolution of the semi-coherent interfaces. This work points out an avenue to obtain high-temperature stability and high reliability in BaTiO 3 -based MLCCs.
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·Vol. 50
·期 24
·54557-54565
·
IF 5.1
Minghao Xu,Kaihui Hua,Bo Di,Yu Zheng,Qun Zeng,Pinhai Gao,Xiuan Xi
BaTiO 3 (BT)-based ceramics have recently become one of the most promising lead-free piezoelectric ceramics . However, its overall performance still falls short of meeting the demands for multifunctional applications. Although phase boundary regulation can enhance the piezoelectric properties , BT ceramics have very separate phase transition temperatures for different phases. This leads to the difficulty of achieving multiphase coexistence at room temperature (RT). In this work, based on doping 0.08 mol Zr 4+ , the lead-free Ba 1- x Sr x Ti 0.92 Zr 0.08 O 3 [ x = 0, 0.04, 0.08, 0.12, 0.16, 0.20 (mol), B 1- x S x TZ] piezoelectric ceramics were prepared using the solid-state reaction method, and the effect of the Sr 2+ doping level on the multiphase structural evolution and piezoelectric properties was systematically investigated. The results demonstrated that with the increase in the Sr 2+ doping content, multiphase coexistence within the B 1- x S x TZ ceramics was successfully achieved at RT. Moreover, it showed significant synergistic improvements in piezoelectric, dielectric , and electric-field-induced strain properties. At the doping level of about x = 0.16 mol, the key performance metrics of the piezoelectric ceramics were optimal. The d 33 at room temperature reached ∼447 pC/N, k p ∼0.49, and ε r ∼4649. Under an applied electric field of 10 kV/cm, S pos was ∼0.092 %, and d 33 ∗ was ∼895 p.m./V. Therefore, this study provides new insights into the progress of advanced lead-free piezoelectric materials for multifunctional applications.
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DOI
高影响因子
Surfaces and Interfaces
·
2026
·
IF 6.3
Yue Zhao,Zhaotian Ba,Yu Long,Yuanyi Kang,Tao Zhang,Meng Xin,Guohua Fan,Chuncheng Hao
The performance contradiction between dielectric constant and breakdown strength restricted the significant improvement in energy storage density of common dielectrics. In this work, the ternary BaTiO 3 @Ag/PVDF composites were prepared, in which the fibrous BaTiO 3 fillers were prepared by electrospinning and further modified with silver (Ag) nanoparticles via silver mirror reaction. Dielectric performance of the composites was effectively improved by the hybrid fillers owing to the synergies of the increased polarizations and the Coulomb blockade effect. Dielectric constant and breakdown strength of the composites with only 0.2 wt% filling content reached 14.8 and 421.7 MV/m, which were respectively increased 124.4% and 135.9% compared to that of the pristine PVDF. And the maximum energy storage density was increased to 4.5 J/cm 3 with the ultra-low content of fillers. This work broke the inherent contradictions in single-layer composites and provided novel attempts for dielectric modulation of dielectrics.
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产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Zhihui Yi,Zhuo Wang,Dan Wu,Ying Xue
Electrostatic capacitors have high power density, but how to improve the energy storage density of electrostatic capacitors has always been the key to solving energy problems in the background of the energy crisis. Designing multi-layer core–shell inorganic nanofillers is an effective way to break the contradiction between high dielectric constant and high breakdown strength in nanocomposites to improve the energy storage performance. Herein, polyvinylidene fluoride (PVDF)-based nanocomposites are proposed, which are filled with multi-layer core–shell structured inorganic BaTiO3@BaxSr1–xTiO3@DA nanoparticles (BT@BST@DA NPs). In the optimized 2 wt % PVDF/BaTiO3@BaxSr1–xTiO3@DA nanoparticle (PVDF/BT@BST@DA NPs) nanocomposite material, a high discharge energy density of 13.75 J/cm3 (370 MV/m) can be obtained, as well as excellent discharge efficiency. The dielectric performance and energy storage density of 2 wt % PVDF/BT@BST@DA NPs are proven to be better than 2 wt % PVDF/BaTiO3@DA nanoparticles (PVDF/BT@DA NPs). This work provides a strategy for the development of dielectrics for electrostatic capacitors with high energy storage density.
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Cong Wu,Xinghui Wei,Kang Zhao,Junyi Jiang,Mengzhen Jiao,Junhua Cheng,Zhen Tang,Zheng Guo,Yufei Tang
Nanotube coatings on titanium surfaces have favorable biocompatibility and structures and are widely used in local drug delivery. However, when a drug freely diffuses out of a nanotube, it leads to an explosive release, making the duration of action extremely short. In this study, a high concentration of vancomycin hydrochloride region similar to a dam was formed on a nanotube coating surface by exploiting the attraction of the electric charge generated by the energy conversion of the piezoelectric effect to vancomycin hydrochloride. The “dam” not only reduces the diffusion rate of vancomycin hydrochloride inside the nanotube into the dam and the diffusion rate of the dam to the outside but also forms a high concentration of vancomycin hydrochloride action region. The free diffusion rate of vancomycin hydrochloride loaded on the TiO 2 @ BaTiO 3 coaxial nanotubes was reduced by the piezoelectric effect, and the cumulative release of vancomycin hydrochloride for 7 days is reduced by 54.8%. The polarized vancomycin-containing coaxial nanotube coating has a long-lasting antibacterial effect on Staphylococcus aureus . The TiO 2 @ BaTiO 3 coaxial nanotubes loaded with vancomycin hydrochloride coating with piezoelectric properties has potential application value in controlled drug delivery.
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）