The Experts below are selected from a list of 219 Experts worldwide ranked by ideXlab platform
Pingkai Jiang - One of the best experts on this subject based on the ideXlab platform.
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enhancing Discharged Energy density and suppressing dielectric loss of poly vinylidene fluoride ter trifluoroethylene ter chlorofluoroethylene by a sandwiched structure
IET Nanodielectrics, 2018Co-Authors: Pingkai Jiang, Xingyi HuangAbstract:Polymer dielectrics with high Energy density and low dielectric loss are highly desired due to the rapid development of electric devices. Among known polymers, poly(vinylidene fluoride-ter-trifluoroethylene-ter-chlorofluoroethylene) P(VDF-TrFE-CFE) is one of the promising materials for Energy storage capacitor applications because of its high dielectric constant. Nevertheless, it suffers from high dielectric loss especially at the high electric field, which suppresses its breakdown strength and Energy storage density. Herein, sandwiched structure dielectric films were fabricated by employing polymethyl methacrylate (PMMA) as the outer layer and P(VDF-TrFE-CFE) as the central layer. By modulating the thickness of the central layer, an enhanced Discharged Energy density of 7.03 J/cm3 is achieved at a high electric field of 480 MV/m, which is 132% more than that of P(VDF-TrFE-CFE) at its maximum electric field 300 MV/m. Meanwhile, this sandwiched structure film also retains a high discharge efficiency of 78% at 480 MV/m, which is never been seen in polyvinylidene fluoride-based polymers. Results show that PMMA acts as charge barrier and simultaneously enhance the breakdown strength and suppress the dielectric loss of P(VDF-TrFE-CFE).
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two dimensional high k nanosheets for dielectric polymer nanocomposites with ultrahigh Discharged Energy density
Journal of Physical Chemistry C, 2018Co-Authors: Pingkai Jiang, Jiandong Wu, Xingyi HuangAbstract:Flexible dielectric materials with high electrical Energy densities are of crucial importance in advanced electronics and electric power systems. The conventional methods for fabricating flexible dielectric materials with high electrical Energy densities are introducing zero-, one-, and three-dimensional high-k inorganic nanofiller into a dielectric polymer matrix while less two-dimensional high-k nanofillers were included. Herein, two-dimensional (2D) high-k titanium dioxide nanosheets prepared by a one-step hydrothermal reaction were utilized to boost the Energy storage performance of dielectric polymer nanocomposites. It was found that compared with the polymer matrix the nanocomposites not only exhibit an enhanced dielectric constant but also show suppressed dielectric loss, which is desirable for Energy storage applications. The nanocomposite with 5 wt % 2D nanosheets exhibits a superhigh Discharged Energy density of 13.0 J/cm3 at 570 MV/m, which is nearly four times greater than that of commercializ...
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enhancing electrical Energy storage capability of dielectric polymer nanocomposites via the room temperature coulomb blockade effect of ultra small platinum nanoparticles
Physical Chemistry Chemical Physics, 2018Co-Authors: Liwei Wang, Xingyi Huang, Pingkai JiangAbstract:Introducing a high dielectric constant (high-k) nanofiller into a dielectric polymer is the most common way to achieve flexible nanocomposites for electrostatic Energy storage devices. However, the significant decrease of breakdown strength and large increase of dielectric loss has long been known as the bottleneck restricting the enhancement of practical Energy storage capability of the nanocomposites. In this study, by introducing ultra-small platinum (<2 nm) nanoparticles, high-k polymer nanocomposites with high breakdown strength and low dielectric loss were prepared successfully. Core–shell structured polydopamine@BaTiO3 (PDA@BT) and core–satellite ultra-small platinum decorated PDA@BT (Pt@PDA@BT) were used as nanofillers. Compared with PDA@BT nanocomposites, the maximum Discharged Energy density of the Pt@PDA@BT nanocomposites is increased by nearly 70% because of the improved Energy storage efficiency. This research provides a simple, promising and unique way to enhance Energy storage capability of high-k polymer nanocomposites.
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Mussel-inspired Fluoro-Polydopamine Functionalization of Titanium Dioxide Nanowires for Polymer Nanocomposites with Significantly Enhanced Energy Storage Capability
Scientific Reports, 2017Co-Authors: Guanyao Wang, Xingyi Huang, Pingkai JiangAbstract:High-dielectric-constant polymer nanocomposites are demonstrated to show great promise as Energy storage materials. However, the large electrical mismatch and incompatibility between nanofillers and polymer matrix usually give rise to significantly reduced breakdown strength and weak Energy storage capability. Therefore, rational selection and elaborate functionalization of nanofillers to optimize the performance of polymer nanocomposites are vital. Herein, inspired by adhesive proteins in mussels, a facile modification by fluoro-polydopamine is employed to reinforce the compatibility of TiO2 nanowires in the fluoropolymer matrix. The loading of 2.5 vol % f-DOPA@TiO2 NWs leads to an ultrahigh Discharged Energy density of 11.48 J cm(-3) at 530 MV m(-1), more than three times of commercial biaxial-oriented polypropylene (BOPP, 3.56 J cm(-3) at 600 MV m(-1)). A gratifying high Energy density of 9.12 J cm(-3) has also been obtained with nanofiller loading as high as 15 vol % at 360 MV m(-1), which is nearly double to that of pure P(VDF-HFP) (4.76 J cm(-3) at 360 MV m(-1)). This splendid Energy storage capability seems to rival or exceed most of previously reported nano-TiO2 based nanocomposites. The methods presented here provide deep insights into the design of polymer nanocomposites for Energy storage applications.
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Energy storage in ferroelectric polymer nanocomposites filled with core-shell structured polymer@BaTiO3nanoparticles: Understanding the role of polymer shells in the interfacial regions
ACS Applied Materials and Interfaces, 2014Co-Authors: Ming Zhu, Xing Zhai, Xingyi Huang, Ke Yang, Jinliang He, Jun Zhang, Pingkai JiangAbstract:The interfacial region plays a critical role in determining the electrical properties and Energy storage density of dielectric polymer nanocomposites. However, we still know a little about the effects of electrical properties of the interfacial regions on the electrical properties and Energy storage of dielectric polymer nanocomposites. In this work, three types of core-shell structured polymer@BaTiO3 nanoparticles with polymer shells having different electrical properties were used as fillers to prepare ferroelectric polymer nanocomposites. All the polymer@BaTiO3 nanoparticles were prepared by surface-initiated reversible-addition-fragmentation chain transfer (RAFT) polymerization, and the polymer shells were controlled to have the same thickness. The morphology, crystal structure, frequency-dependent dielectric properties, breakdown strength, leakage currents, Energy storage capability, and Energy storage efficiency of the polymer nanocomposites were investigated. On the other hand, the pure polymers having the same molecular structure as the shells of polymer@BaTiO3 nanoparticles were also prepared by RAFT polymerization, and their electrical properties were provided. Our results show that, to achieve nanocomposites with high Discharged Energy density, the core-shell nanoparticle filler should simultaneously have high dielectric constant and low electrical conductivity. On the other hand, the breakdown strength of the polymer@BaTiO3-based nanocomposites is highly affected by the electrical properties of the polymer shells. It is believed that the electrical conductivity of the polymer shells should be as low as possible to achieve nanocomposites with high breakdown strength.
Jiwei Zhai - One of the best experts on this subject based on the ideXlab platform.
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highly enhanced Discharged Energy density of polymer nanocomposites via a novel hybrid structure as fillers
Journal of Materials Chemistry, 2019Co-Authors: Shuang Xing, Haitao Jiang, Shuangwu Huang, Jiwei ZhaiAbstract:Electrostatic capacitors with a high dielectric constant and breakdown strength are desired for dielectrics to achieve a higher Discharged Energy density. Here, we propose that an artificial polymer nanocomposite combining a novel hybrid structure of one-dimensional Ag@BaTiO3@polydopamine@Ag nanofibers (1D ABPAs) as fillers and poly(vinylidene fluoride-hexafluoropropylene) [P(VDF-HFP)] as the matrix demonstrated a remarkably comprehensive performance. A large displacement (9.84 μC cm−2 at 480 MV m−1) was observed so as to obtain a high Discharged Energy density (∼17.25 J cm−3) of the composite films with 3 vol% 1D ABPAs, which was 2.22-times that of pristine P(VDF-HFP) (∼7.74 J cm−3). This Discharged Energy density is among the highest under an equivalent electric field strength reported so far. The corresponding composite films exhibited a superior charge/discharge speed of 139 ns and excellent reliability in Energy storage performance by consecutive cycling. This work could provide an effective way to design and improve the performance of polymer-based nanocomposites for capacitive Energy-storage applications.
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Discharged Energy density and efficiency of nanocomposites based on poly vinylidene fluoride and core shell structured batio3 al2o3 nanoparticles
Ceramics International, 2018Co-Authors: Jiao Wang, Limin Zhao, Jiwei ZhaiAbstract:Abstract High Discharged Energy density and efficiency composites dielectric capacitors have gained world-wide attention. We apply a solution casting method to prepare films of PVDF nanocomposites containing sol-gel processed core-shell structured BaTiO 3 @Al 2 O 3 nanoparticles. Their interfacial polarization and Discharged Energy density performance were investigated. On the morphological characterizations, the core-shell nanoparticles based on TEM were found to have Al 2 O 3 with an average thickness of 6 nm, which acts as a shell layer coating on the surface of the BaTiO 3 -core. SEM results indicate that the core-shell nanoparticles created are dispersed uniformly in the PVDF matrix. Among the studied PVDF nanocomposites with different BaTiO 3 @Al 2 O 3 nanoparticle loadings, the nanocomposite with 5 vol% BaTiO 3 @Al 2 O 3 nanoparticles shows the highest Discharged Energy density of 6.1 J/cm 3 , which is 1.2 times higher than that of the nanocomposite with pure BaTiO 3 nanoparticles. For the 5 vol% of BaTiO 3 @Al 2 O 3 nanoparticles added, the resulting nanocomposite exhibits a high efficiency of 81.6% below 1000 kV/cm and is higher than 66.5% at 2800 kV/cm. The enhanced Discharged Energy density and efficiency could be attributed to the improvement of the Maxwell-Wagner-Sillars interfacial polarization at the dynamic interface between PVDF matrix and BaTiO 3 @Al 2 O 3 nanoparticles by which the difference of dielectric constant at the interface is reduced.
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Discharged Energy density and efficiency of nanocomposites based on poly(vinylidene fluoride) and core-shell structured BaTiO3@Al2O3 nanoparticles
Ceramics International, 2018Co-Authors: Jiao Wang, Limin Zhao, Jiwei ZhaiAbstract:Abstract High Discharged Energy density and efficiency composites dielectric capacitors have gained world-wide attention. We apply a solution casting method to prepare films of PVDF nanocomposites containing sol-gel processed core-shell structured BaTiO 3 @Al 2 O 3 nanoparticles. Their interfacial polarization and Discharged Energy density performance were investigated. On the morphological characterizations, the core-shell nanoparticles based on TEM were found to have Al 2 O 3 with an average thickness of 6 nm, which acts as a shell layer coating on the surface of the BaTiO 3 -core. SEM results indicate that the core-shell nanoparticles created are dispersed uniformly in the PVDF matrix. Among the studied PVDF nanocomposites with different BaTiO 3 @Al 2 O 3 nanoparticle loadings, the nanocomposite with 5 vol% BaTiO 3 @Al 2 O 3 nanoparticles shows the highest Discharged Energy density of 6.1 J/cm 3 , which is 1.2 times higher than that of the nanocomposite with pure BaTiO 3 nanoparticles. For the 5 vol% of BaTiO 3 @Al 2 O 3 nanoparticles added, the resulting nanocomposite exhibits a high efficiency of 81.6% below 1000 kV/cm and is higher than 66.5% at 2800 kV/cm. The enhanced Discharged Energy density and efficiency could be attributed to the improvement of the Maxwell-Wagner-Sillars interfacial polarization at the dynamic interface between PVDF matrix and BaTiO 3 @Al 2 O 3 nanoparticles by which the difference of dielectric constant at the interface is reduced.
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poly vinylidene fluoride nanocomposites with a small loading of core shell structured batio3 al2o3 nanofibers exhibiting high Discharged Energy density and efficiency
Journal of Alloys and Compounds, 2017Co-Authors: Jiao Wang, Bo Shen, Jiwei Zhai, Limin ZhaoAbstract:Abstract BaTiO 3 @Al 2 O 3 core-shell nanofibers (BT@Al 2 O 3 NF) have been successfully synthesized. Homogeneous nanocomposites consisting of BT@Al 2 O 3 NF and a Poly(vinylidene fluoride) (PVDF) polymer matrix have been prepared by the solution casting method. A systematic study was investigated on the effect of BT@Al 2 O 3 NF filler introduction on the Discharged Energy density performance of the nanocomposite. Al 2 O 3 shell dramatically reduces the leakage current by prevent the contact between BT NF fillers in nanocomposites and minimize the Maxwell-Wagner-Sillars interfacial polarization, which results in the enhancement of the breakdown strength of nanocomposites films. Simultaneously, the nanocomposites have higher maximum polarization and lower the remnant polarization than that of PVDF films under the same electric field. The maximum Discharged Energy density of the nanocomposites with 2.5 vol% BT@Al 2 O 3 NF reaches 7.1 J/cm 3 at 3800 kV/cm with an efficiency of above 65.1%. This work may provide an effective solution for enhancing the Discharged Energy density of nanocomposites films.
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Poly(vinylidene fluoride) nanocomposites with a small loading of core-shell structured BaTiO3@Al2O3 nanofibers exhibiting high Discharged Energy density and efficiency
Journal of Alloys and Compounds, 2017Co-Authors: Jiao Wang, Bo Shen, Jiwei Zhai, Limin ZhaoAbstract:Abstract BaTiO 3 @Al 2 O 3 core-shell nanofibers (BT@Al 2 O 3 NF) have been successfully synthesized. Homogeneous nanocomposites consisting of BT@Al 2 O 3 NF and a Poly(vinylidene fluoride) (PVDF) polymer matrix have been prepared by the solution casting method. A systematic study was investigated on the effect of BT@Al 2 O 3 NF filler introduction on the Discharged Energy density performance of the nanocomposite. Al 2 O 3 shell dramatically reduces the leakage current by prevent the contact between BT NF fillers in nanocomposites and minimize the Maxwell-Wagner-Sillars interfacial polarization, which results in the enhancement of the breakdown strength of nanocomposites films. Simultaneously, the nanocomposites have higher maximum polarization and lower the remnant polarization than that of PVDF films under the same electric field. The maximum Discharged Energy density of the nanocomposites with 2.5 vol% BT@Al 2 O 3 NF reaches 7.1 J/cm 3 at 3800 kV/cm with an efficiency of above 65.1%. This work may provide an effective solution for enhancing the Discharged Energy density of nanocomposites films.
Xingyi Huang - One of the best experts on this subject based on the ideXlab platform.
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enhancing Discharged Energy density and suppressing dielectric loss of poly vinylidene fluoride ter trifluoroethylene ter chlorofluoroethylene by a sandwiched structure
IET Nanodielectrics, 2018Co-Authors: Pingkai Jiang, Xingyi HuangAbstract:Polymer dielectrics with high Energy density and low dielectric loss are highly desired due to the rapid development of electric devices. Among known polymers, poly(vinylidene fluoride-ter-trifluoroethylene-ter-chlorofluoroethylene) P(VDF-TrFE-CFE) is one of the promising materials for Energy storage capacitor applications because of its high dielectric constant. Nevertheless, it suffers from high dielectric loss especially at the high electric field, which suppresses its breakdown strength and Energy storage density. Herein, sandwiched structure dielectric films were fabricated by employing polymethyl methacrylate (PMMA) as the outer layer and P(VDF-TrFE-CFE) as the central layer. By modulating the thickness of the central layer, an enhanced Discharged Energy density of 7.03 J/cm3 is achieved at a high electric field of 480 MV/m, which is 132% more than that of P(VDF-TrFE-CFE) at its maximum electric field 300 MV/m. Meanwhile, this sandwiched structure film also retains a high discharge efficiency of 78% at 480 MV/m, which is never been seen in polyvinylidene fluoride-based polymers. Results show that PMMA acts as charge barrier and simultaneously enhance the breakdown strength and suppress the dielectric loss of P(VDF-TrFE-CFE).
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two dimensional high k nanosheets for dielectric polymer nanocomposites with ultrahigh Discharged Energy density
Journal of Physical Chemistry C, 2018Co-Authors: Pingkai Jiang, Jiandong Wu, Xingyi HuangAbstract:Flexible dielectric materials with high electrical Energy densities are of crucial importance in advanced electronics and electric power systems. The conventional methods for fabricating flexible dielectric materials with high electrical Energy densities are introducing zero-, one-, and three-dimensional high-k inorganic nanofiller into a dielectric polymer matrix while less two-dimensional high-k nanofillers were included. Herein, two-dimensional (2D) high-k titanium dioxide nanosheets prepared by a one-step hydrothermal reaction were utilized to boost the Energy storage performance of dielectric polymer nanocomposites. It was found that compared with the polymer matrix the nanocomposites not only exhibit an enhanced dielectric constant but also show suppressed dielectric loss, which is desirable for Energy storage applications. The nanocomposite with 5 wt % 2D nanosheets exhibits a superhigh Discharged Energy density of 13.0 J/cm3 at 570 MV/m, which is nearly four times greater than that of commercializ...
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enhancing electrical Energy storage capability of dielectric polymer nanocomposites via the room temperature coulomb blockade effect of ultra small platinum nanoparticles
Physical Chemistry Chemical Physics, 2018Co-Authors: Liwei Wang, Xingyi Huang, Pingkai JiangAbstract:Introducing a high dielectric constant (high-k) nanofiller into a dielectric polymer is the most common way to achieve flexible nanocomposites for electrostatic Energy storage devices. However, the significant decrease of breakdown strength and large increase of dielectric loss has long been known as the bottleneck restricting the enhancement of practical Energy storage capability of the nanocomposites. In this study, by introducing ultra-small platinum (<2 nm) nanoparticles, high-k polymer nanocomposites with high breakdown strength and low dielectric loss were prepared successfully. Core–shell structured polydopamine@BaTiO3 (PDA@BT) and core–satellite ultra-small platinum decorated PDA@BT (Pt@PDA@BT) were used as nanofillers. Compared with PDA@BT nanocomposites, the maximum Discharged Energy density of the Pt@PDA@BT nanocomposites is increased by nearly 70% because of the improved Energy storage efficiency. This research provides a simple, promising and unique way to enhance Energy storage capability of high-k polymer nanocomposites.
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Mussel-inspired Fluoro-Polydopamine Functionalization of Titanium Dioxide Nanowires for Polymer Nanocomposites with Significantly Enhanced Energy Storage Capability
Scientific Reports, 2017Co-Authors: Guanyao Wang, Xingyi Huang, Pingkai JiangAbstract:High-dielectric-constant polymer nanocomposites are demonstrated to show great promise as Energy storage materials. However, the large electrical mismatch and incompatibility between nanofillers and polymer matrix usually give rise to significantly reduced breakdown strength and weak Energy storage capability. Therefore, rational selection and elaborate functionalization of nanofillers to optimize the performance of polymer nanocomposites are vital. Herein, inspired by adhesive proteins in mussels, a facile modification by fluoro-polydopamine is employed to reinforce the compatibility of TiO2 nanowires in the fluoropolymer matrix. The loading of 2.5 vol % f-DOPA@TiO2 NWs leads to an ultrahigh Discharged Energy density of 11.48 J cm(-3) at 530 MV m(-1), more than three times of commercial biaxial-oriented polypropylene (BOPP, 3.56 J cm(-3) at 600 MV m(-1)). A gratifying high Energy density of 9.12 J cm(-3) has also been obtained with nanofiller loading as high as 15 vol % at 360 MV m(-1), which is nearly double to that of pure P(VDF-HFP) (4.76 J cm(-3) at 360 MV m(-1)). This splendid Energy storage capability seems to rival or exceed most of previously reported nano-TiO2 based nanocomposites. The methods presented here provide deep insights into the design of polymer nanocomposites for Energy storage applications.
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Energy storage in ferroelectric polymer nanocomposites filled with core-shell structured polymer@BaTiO3nanoparticles: Understanding the role of polymer shells in the interfacial regions
ACS Applied Materials and Interfaces, 2014Co-Authors: Ming Zhu, Xing Zhai, Xingyi Huang, Ke Yang, Jinliang He, Jun Zhang, Pingkai JiangAbstract:The interfacial region plays a critical role in determining the electrical properties and Energy storage density of dielectric polymer nanocomposites. However, we still know a little about the effects of electrical properties of the interfacial regions on the electrical properties and Energy storage of dielectric polymer nanocomposites. In this work, three types of core-shell structured polymer@BaTiO3 nanoparticles with polymer shells having different electrical properties were used as fillers to prepare ferroelectric polymer nanocomposites. All the polymer@BaTiO3 nanoparticles were prepared by surface-initiated reversible-addition-fragmentation chain transfer (RAFT) polymerization, and the polymer shells were controlled to have the same thickness. The morphology, crystal structure, frequency-dependent dielectric properties, breakdown strength, leakage currents, Energy storage capability, and Energy storage efficiency of the polymer nanocomposites were investigated. On the other hand, the pure polymers having the same molecular structure as the shells of polymer@BaTiO3 nanoparticles were also prepared by RAFT polymerization, and their electrical properties were provided. Our results show that, to achieve nanocomposites with high Discharged Energy density, the core-shell nanoparticle filler should simultaneously have high dielectric constant and low electrical conductivity. On the other hand, the breakdown strength of the polymer@BaTiO3-based nanocomposites is highly affected by the electrical properties of the polymer shells. It is believed that the electrical conductivity of the polymer shells should be as low as possible to achieve nanocomposites with high breakdown strength.
Jiao Wang - One of the best experts on this subject based on the ideXlab platform.
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Discharged Energy density and efficiency of nanocomposites based on poly vinylidene fluoride and core shell structured batio3 al2o3 nanoparticles
Ceramics International, 2018Co-Authors: Jiao Wang, Limin Zhao, Jiwei ZhaiAbstract:Abstract High Discharged Energy density and efficiency composites dielectric capacitors have gained world-wide attention. We apply a solution casting method to prepare films of PVDF nanocomposites containing sol-gel processed core-shell structured BaTiO 3 @Al 2 O 3 nanoparticles. Their interfacial polarization and Discharged Energy density performance were investigated. On the morphological characterizations, the core-shell nanoparticles based on TEM were found to have Al 2 O 3 with an average thickness of 6 nm, which acts as a shell layer coating on the surface of the BaTiO 3 -core. SEM results indicate that the core-shell nanoparticles created are dispersed uniformly in the PVDF matrix. Among the studied PVDF nanocomposites with different BaTiO 3 @Al 2 O 3 nanoparticle loadings, the nanocomposite with 5 vol% BaTiO 3 @Al 2 O 3 nanoparticles shows the highest Discharged Energy density of 6.1 J/cm 3 , which is 1.2 times higher than that of the nanocomposite with pure BaTiO 3 nanoparticles. For the 5 vol% of BaTiO 3 @Al 2 O 3 nanoparticles added, the resulting nanocomposite exhibits a high efficiency of 81.6% below 1000 kV/cm and is higher than 66.5% at 2800 kV/cm. The enhanced Discharged Energy density and efficiency could be attributed to the improvement of the Maxwell-Wagner-Sillars interfacial polarization at the dynamic interface between PVDF matrix and BaTiO 3 @Al 2 O 3 nanoparticles by which the difference of dielectric constant at the interface is reduced.
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Discharged Energy density and efficiency of nanocomposites based on poly(vinylidene fluoride) and core-shell structured BaTiO3@Al2O3 nanoparticles
Ceramics International, 2018Co-Authors: Jiao Wang, Limin Zhao, Jiwei ZhaiAbstract:Abstract High Discharged Energy density and efficiency composites dielectric capacitors have gained world-wide attention. We apply a solution casting method to prepare films of PVDF nanocomposites containing sol-gel processed core-shell structured BaTiO 3 @Al 2 O 3 nanoparticles. Their interfacial polarization and Discharged Energy density performance were investigated. On the morphological characterizations, the core-shell nanoparticles based on TEM were found to have Al 2 O 3 with an average thickness of 6 nm, which acts as a shell layer coating on the surface of the BaTiO 3 -core. SEM results indicate that the core-shell nanoparticles created are dispersed uniformly in the PVDF matrix. Among the studied PVDF nanocomposites with different BaTiO 3 @Al 2 O 3 nanoparticle loadings, the nanocomposite with 5 vol% BaTiO 3 @Al 2 O 3 nanoparticles shows the highest Discharged Energy density of 6.1 J/cm 3 , which is 1.2 times higher than that of the nanocomposite with pure BaTiO 3 nanoparticles. For the 5 vol% of BaTiO 3 @Al 2 O 3 nanoparticles added, the resulting nanocomposite exhibits a high efficiency of 81.6% below 1000 kV/cm and is higher than 66.5% at 2800 kV/cm. The enhanced Discharged Energy density and efficiency could be attributed to the improvement of the Maxwell-Wagner-Sillars interfacial polarization at the dynamic interface between PVDF matrix and BaTiO 3 @Al 2 O 3 nanoparticles by which the difference of dielectric constant at the interface is reduced.
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poly vinylidene fluoride nanocomposites with a small loading of core shell structured batio3 al2o3 nanofibers exhibiting high Discharged Energy density and efficiency
Journal of Alloys and Compounds, 2017Co-Authors: Jiao Wang, Bo Shen, Jiwei Zhai, Limin ZhaoAbstract:Abstract BaTiO 3 @Al 2 O 3 core-shell nanofibers (BT@Al 2 O 3 NF) have been successfully synthesized. Homogeneous nanocomposites consisting of BT@Al 2 O 3 NF and a Poly(vinylidene fluoride) (PVDF) polymer matrix have been prepared by the solution casting method. A systematic study was investigated on the effect of BT@Al 2 O 3 NF filler introduction on the Discharged Energy density performance of the nanocomposite. Al 2 O 3 shell dramatically reduces the leakage current by prevent the contact between BT NF fillers in nanocomposites and minimize the Maxwell-Wagner-Sillars interfacial polarization, which results in the enhancement of the breakdown strength of nanocomposites films. Simultaneously, the nanocomposites have higher maximum polarization and lower the remnant polarization than that of PVDF films under the same electric field. The maximum Discharged Energy density of the nanocomposites with 2.5 vol% BT@Al 2 O 3 NF reaches 7.1 J/cm 3 at 3800 kV/cm with an efficiency of above 65.1%. This work may provide an effective solution for enhancing the Discharged Energy density of nanocomposites films.
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Poly(vinylidene fluoride) nanocomposites with a small loading of core-shell structured BaTiO3@Al2O3 nanofibers exhibiting high Discharged Energy density and efficiency
Journal of Alloys and Compounds, 2017Co-Authors: Jiao Wang, Bo Shen, Jiwei Zhai, Limin ZhaoAbstract:Abstract BaTiO 3 @Al 2 O 3 core-shell nanofibers (BT@Al 2 O 3 NF) have been successfully synthesized. Homogeneous nanocomposites consisting of BT@Al 2 O 3 NF and a Poly(vinylidene fluoride) (PVDF) polymer matrix have been prepared by the solution casting method. A systematic study was investigated on the effect of BT@Al 2 O 3 NF filler introduction on the Discharged Energy density performance of the nanocomposite. Al 2 O 3 shell dramatically reduces the leakage current by prevent the contact between BT NF fillers in nanocomposites and minimize the Maxwell-Wagner-Sillars interfacial polarization, which results in the enhancement of the breakdown strength of nanocomposites films. Simultaneously, the nanocomposites have higher maximum polarization and lower the remnant polarization than that of PVDF films under the same electric field. The maximum Discharged Energy density of the nanocomposites with 2.5 vol% BT@Al 2 O 3 NF reaches 7.1 J/cm 3 at 3800 kV/cm with an efficiency of above 65.1%. This work may provide an effective solution for enhancing the Discharged Energy density of nanocomposites films.
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core shell structured batio3 sio2 nanofibers for poly vinylidene fluoride nanocomposites with high Discharged Energy
Materials Letters, 2017Co-Authors: Jiao Wang, Jingyi Wang, Bo Shen, Jiwei Zhai, Jingqi ZhouAbstract:Abstract Nanocomposite based on poly(vinylidene fluoride) (PVDF) polymer filled with surface functionalized core-shell structure BaTiO 3 @SiO 2 nanofibers (BT@SiO 2 NF) were prepared via the solution casting method. The effect of BT@SiO 2 NF filler introduction on the Discharged Energy density performance of the nanocomposite were investigated. The results indicated that the Discharged Energy density of nanocomposites is enhanced and the maximum Discharged Energy density in the nanocomposite with 2.5 vol% BT@SiO 2 NF is 6.6 J/cm 3 at 3500 kV/cm with an efficiency of above 62.7%. The reason of the enhancement of the Discharged Energy density performance is that coating SiO 2 layers on the surface of BT NF reduces the Maxwell–Wagner–Sillars interfacial polarization. This work may provide a novel route to enhance Discharged Energy density performance using core-shell nanofibers in polymer-based nanocomposites.
Haibo Zhang - One of the best experts on this subject based on the ideXlab platform.
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ultrahigh Discharged Energy density in polymer nanocomposites by designing linear ferroelectric bilayer heterostructure
Nano Energy, 2018Co-Authors: Qi Zhang, Ling Zhang, Haibo ZhangAbstract:Abstract The development of advanced dielectric materials with high Discharged Energy densities is of critical significance for modern electric devices and electric power systems. In this report, linear/ferroelectric bilayer-heterostructured polymer nanocomposites with an ultrahigh Discharged Energy is presented for the first time. The linear polyimide (PI) is employed as bottom insulating layer to provide high breakdown strength (Eb), while ferroelectric P(VDF-CTFE) with dispersed BaTiO3 nanoparticles as the top layer, provides a high dielectric constant. This linear/ferroelectric bilayer dielectric material exhibits enhanced Eb and (Dmax-Pr) values, which can be attributed to the interfacial barrier and the interfacial polarization effect at the interface of two layers. Favorable distribution of the local electric field within this bilayer dielectric reveals the implication of the collaborative double interface effects on the Energy storage performance of the nanocomposites. As a result, the bilayer-heterostructured nanocomposite displays an ultrahigh Discharged Energy density of 14.2 J/cm3 at 370 MV/m. This Energy density is among the highest under the equivalent electric field strength reported so far. This work not only provides a new design to optimize the performance of the dielectric nanocomposites for flexible Energy storage applications, but also develops the understanding of the breakdown and polarization mechanism of dielectric materials.
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Ultrahigh Discharged Energy density in polymer nanocomposites by designing linear/ferroelectric bilayer heterostructure
Nano Energy, 2018Co-Authors: Qi Zhang, Ling Zhang, Haibo ZhangAbstract:Abstract The development of advanced dielectric materials with high Discharged Energy densities is of critical significance for modern electric devices and electric power systems. In this report, linear/ferroelectric bilayer-heterostructured polymer nanocomposites with an ultrahigh Discharged Energy is presented for the first time. The linear polyimide (PI) is employed as bottom insulating layer to provide high breakdown strength (Eb), while ferroelectric P(VDF-CTFE) with dispersed BaTiO3 nanoparticles as the top layer, provides a high dielectric constant. This linear/ferroelectric bilayer dielectric material exhibits enhanced Eb and (Dmax-Pr) values, which can be attributed to the interfacial barrier and the interfacial polarization effect at the interface of two layers. Favorable distribution of the local electric field within this bilayer dielectric reveals the implication of the collaborative double interface effects on the Energy storage performance of the nanocomposites. As a result, the bilayer-heterostructured nanocomposite displays an ultrahigh Discharged Energy density of 14.2 J/cm3 at 370 MV/m. This Energy density is among the highest under the equivalent electric field strength reported so far. This work not only provides a new design to optimize the performance of the dielectric nanocomposites for flexible Energy storage applications, but also develops the understanding of the breakdown and polarization mechanism of dielectric materials.
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high Discharged Energy density of nanocomposites filled with double layered core shell nanoparticles by reducing space charge polarization
Ceramics International, 2018Co-Authors: Songliu Yuan, Chengliang Lu, Mohsin Ali Marwat, Haibo ZhangAbstract:Abstract Polymer-based nanocomposite capacitors for Energy storage with high Discharged Energy density and charge-discharge efficiency are of great importance to modern electronic devices and electrical systems. Herein, the Energy storage properties are improved by applying double-layered core-shell nanoparticles as fillers. The dopamine was adopted as the outermost layer to improve the dispersibility and compatibility between the fillers and matrix. The high resistance of SiO 2 works as a barrier to limit the movement of space charge over the BaTiO 3 (BT) surface when a high electric field is applied, leading to an enhancement of breakdown strength as well as a decreased space charge polarization, so that an enhancement of Discharged Energy density and charge-discharge efficiency are achieved. The SiO 2 @BT/P(VDF-CTFE) also shows weaker frequency dependence, indicating the reduction of space charge polarization. A possible mechanism of reduced space charge polarization was proposed to explain the effects of SiO 2 . This work demonstrates that constructing a core-shell structure with high resistance is an effective way to improve the Energy properties of nanocomposite capacitors.
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high Discharged Energy density of polymer nanocomposites containing paraelectric srtio3 nanowires for flexible Energy storage device
Journal of Alloys and Compounds, 2018Co-Authors: Haibo Zhang, Zeyu LiAbstract:Abstract Nanocomposites combining high permittivity ferroelectric nanofillers and high breakdown strength polymer have shown tremendous potential for pulsed power applications. Nevertheless, the Discharged Energy density and efficiency of these nanocomposites filled with ferroelectric fillers are limited due to the large remanent polarization of ferroelectric fillers employed. Here, uniform elongated morphology paraelectric SrTiO 3 nanowires fillers were synthesized via a special stirring hydrothermal method. The fabricated P(VDF-CTFE)-based nanocomposites containing 3 vol% paraelectric SrTiO 3 nanowires exhibit an enhanced Discharged Energy density of 8.8 J/cm 3 at 3381 kV/cm, which exceeds most of the current reports at the same electric field. By direct comparison study with ferroelectric BaTiO 3 nanowires fillers, the results show paraelectric SrTiO 3 nanowires can simultaneously improve the Discharged Energy density and efficiency more effectively. Such enhancement in Energy storage performance can be attributed to the following reasons: (I) The enhanced breakdown strength, which resulted from the reduced inhomogeneous electric fields via adopting the SrTiO 3 nanowires with lower permittivity. (II) The paraelectric phase SrTiO 3 nanowires show little hysteresis behavior compared to ferroelectric phase BaTiO 3 nanowires. This work is of critical significance in making advanced dielectric nanocomposites that are viable for Energy storage devices in current electronic and electrical applications.