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Ultrahigh discharge efficiency and energy density achieved at low electric fields in sandwich-structured polymer films containing dielectric elastomers SCIE
期刊论文 | 2019 , 7 (8) , 3729-3736 | JOURNAL OF MATERIALS CHEMISTRY A
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Abstract :

Dielectric polymer capacitors, especially those capable of operating efficiently at relatively low operating voltages, are urgently needed to meet the growing demands for miniaturization and reliability in advanced electronics and electrical power systems in automobiles and aerospace. However, high-performance energy storage properties are normally obtained in dielectric capacitors under the application of high electric fields. Herein, a series of all-polymer sandwich-structured films comprised of acrylic rubber dielectric elastomers (DE) dispersed in ferroelectric poly(vinylidene fluoride-cohexafluoropropene) as the outer layer and poly(methyl methacrylate) as the middle layer have been fabricated. The maximum electrical displacement, energy density, and discharge efficiency of the sandwiched films have been improved significantly by optimizing the DE content. Notably, a high energy density of 11.8 J cm(-3) along with a very high efficiency of 89% has been achieved in the sandwiched film with 30 wt% DE at an applied field of 300 MV m(-1), which is the best overall property set ever achieved in the representative polymer dielectrics. Excellent power density and great stability of energy storage performance over the bending cycles have been demonstrated in the layered films. All these features offer new opportunities for designing a new class of hierarchically structured dielectric polymers with excellent energy storage capability that can be achieved at relatively low electric fields.

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GB/T 7714 Chen, Jie , Wang, Yifei , Xu, Xinwei et al. Ultrahigh discharge efficiency and energy density achieved at low electric fields in sandwich-structured polymer films containing dielectric elastomers [J]. | JOURNAL OF MATERIALS CHEMISTRY A , 2019 , 7 (8) : 3729-3736 .
MLA Chen, Jie et al. "Ultrahigh discharge efficiency and energy density achieved at low electric fields in sandwich-structured polymer films containing dielectric elastomers" . | JOURNAL OF MATERIALS CHEMISTRY A 7 . 8 (2019) : 3729-3736 .
APA Chen, Jie , Wang, Yifei , Xu, Xinwei , Yuan, Qibin , Niu, Yujuan , Wang, Qing et al. Ultrahigh discharge efficiency and energy density achieved at low electric fields in sandwich-structured polymer films containing dielectric elastomers . | JOURNAL OF MATERIALS CHEMISTRY A , 2019 , 7 (8) , 3729-3736 .
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Interface thickness optimization of lead-free oxide multilayer capacitors for high-performance energy storage EI SCIE Scopus
期刊论文 | 2018 , 6 (4) , 1858-1864 | JOURNAL OF MATERIALS CHEMISTRY A
WoS CC Cited Count: 4 SCOPUS Cited Count: 5
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Abstract :

The effects of interface density and total multilayer film thickness on the dielectric properties and breakdown behavior have been revealed in this work by investigating the environment-friendly energy storage multilayer films of Ba0.7Ca0.3TiO3 (BCT) and BaZr0.2Ti0.8O3 (BZT) dielectrics. Numerical simulations based on a finite element method have given the breakdown process vividly, which agreed well with the experimental results. Moreover, not only the ultrahigh energy storage density of 51.8 J cm(-3) with a great efficiency of 81.2% at room temperature but also robust thermal stability has been obtained by optimizing the interface density and total thickness. High energy density above 25.1 J cm(-3) and excellent efficiency over 63.6% from room temperature to 200 degrees C provide a solid basis for potential applications of the multilayer systems in harsh environments.

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GB/T 7714 Sun, Zixiong , Wang, Linxi , Liu, Ming et al. Interface thickness optimization of lead-free oxide multilayer capacitors for high-performance energy storage [J]. | JOURNAL OF MATERIALS CHEMISTRY A , 2018 , 6 (4) : 1858-1864 .
MLA Sun, Zixiong et al. "Interface thickness optimization of lead-free oxide multilayer capacitors for high-performance energy storage" . | JOURNAL OF MATERIALS CHEMISTRY A 6 . 4 (2018) : 1858-1864 .
APA Sun, Zixiong , Wang, Linxi , Liu, Ming , Ma, Chunrui , Liang, Zhongshuai , Fan, Qiaolan et al. Interface thickness optimization of lead-free oxide multilayer capacitors for high-performance energy storage . | JOURNAL OF MATERIALS CHEMISTRY A , 2018 , 6 (4) , 1858-1864 .
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Heteroepitaxial growth and interface structure of pyrochlore (Ca,Ti)(2)(Nb,Ti)(2)O-7 thin films on (110) NdGaO3 substrates EI SCIE Scopus
期刊论文 | 2018 , 484 , 64-69 | JOURNAL OF CRYSTAL GROWTH
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Abstract :

Epitaxial thin films of (Ca, Ti)(2)(Nb, Ti)(2)O-7 with pyrochlore structure have been successfully fabricated on orthorhombic (1 1 0) NdGaO3 substrates by a magnetron sputtering system. By analysis of selected-area electron diffraction patterns, the film-substrate orientation relationship is determined to be < 0 0 1 >[1 0 0](film)//(0 0 1)(1 1 0)(substrate). Atomic-scale structure investigations of the heterointerface by means of advanced electron microscopy reveal that a perovskite-type Ca(Ti, Nb)O-3 layer with a thickness of several unit cells forms between the (Ca, Ti)(2)(Nb, Ti)(2)O-7 films and the NdGaO3 substrates. The formation of the Ca(Ti, Nb) O3 layer results from the demand for accommodation of the crystal structure mismatching between the pyrochlore film and the perovskite-type substrate, which favors the epitaxial growth of the (Ca, Ti)(2)(Nb, Ti)(2)O-7 films on the NdGaO3 substrates. (C) 2017 Elsevier B.V. All rights reserved.

Keyword :

Advanced electron microscopy Interface Pyrochlore structure Thin films

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GB/T 7714 Jin, Xiao-Wei , Chen, Yue-Hua , Lu, Lu et al. Heteroepitaxial growth and interface structure of pyrochlore (Ca,Ti)(2)(Nb,Ti)(2)O-7 thin films on (110) NdGaO3 substrates [J]. | JOURNAL OF CRYSTAL GROWTH , 2018 , 484 : 64-69 .
MLA Jin, Xiao-Wei et al. "Heteroepitaxial growth and interface structure of pyrochlore (Ca,Ti)(2)(Nb,Ti)(2)O-7 thin films on (110) NdGaO3 substrates" . | JOURNAL OF CRYSTAL GROWTH 484 (2018) : 64-69 .
APA Jin, Xiao-Wei , Chen, Yue-Hua , Lu, Lu , Mi, Shao-Bo , Jin, Lei , Jing, Hong-Mei et al. Heteroepitaxial growth and interface structure of pyrochlore (Ca,Ti)(2)(Nb,Ti)(2)O-7 thin films on (110) NdGaO3 substrates . | JOURNAL OF CRYSTAL GROWTH , 2018 , 484 , 64-69 .
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Effect of the coverage level of carboxylic acids as a modifier for barium titanate nanoparticles on the performance of poly(vinylidene fluoride)-based nanocomposites for energy storage applications SCIE PubMed Scopus
期刊论文 | 2018 , 20 (9) , 6598-6605 | PHYSICAL CHEMISTRY CHEMICAL PHYSICS
WoS CC Cited Count: 5 SCOPUS Cited Count: 7
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Abstract :

Surface modification on nanoparticle fillers with organic groups is important to improve the performance of ceramic/ polymer nanocomposites. Due to the small coverage level of carboxylic acids on the nanoparticle surface, studies on the use of carboxylic acids as a surface modifier for ceramic nanoparticles have been rarely reported. However, there is no study that proves that a small amount of modifier on the surface of nanoparticles cannot adequately improve the dispersion as well as the compatibility of nanoparticles with the matrix. Herein, we used three carboxylic acids to treat the surface of BaTiO3 (BT) nanoparticles and adjusted the coverage level of the modifiers on the surface of BT nanoparticles through different ways. The nanocomposite films synthesized from the modified BT nanoparticles dispersed in the poly(vinylidene fluoride) (PVDF) polymer matrix were analyzed by dielectric spectroscopy, breakdown strength, leakage currents, and D-E loop measurements. The results show that the molecule dipole moment and polarizability of the modifier greatly influence the permittivity of the nanocomposites as the surface coverage level of the modifiers increases. Due to many influential factors, changes in the breakdown strength of the nanocomposites show diversity for three modifiers as the modifier content increases. For the nanocomposites applied in energy storage, the optimal content of the modifier on the surface of the nanoparticles needs to be determined by combining various properties of the nanocomposites.

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GB/T 7714 Niu, Yujuan , Xiang, Feng , Wang, Yifei et al. Effect of the coverage level of carboxylic acids as a modifier for barium titanate nanoparticles on the performance of poly(vinylidene fluoride)-based nanocomposites for energy storage applications [J]. | PHYSICAL CHEMISTRY CHEMICAL PHYSICS , 2018 , 20 (9) : 6598-6605 .
MLA Niu, Yujuan et al. "Effect of the coverage level of carboxylic acids as a modifier for barium titanate nanoparticles on the performance of poly(vinylidene fluoride)-based nanocomposites for energy storage applications" . | PHYSICAL CHEMISTRY CHEMICAL PHYSICS 20 . 9 (2018) : 6598-6605 .
APA Niu, Yujuan , Xiang, Feng , Wang, Yifei , Chen, Jie , Wang, Hong . Effect of the coverage level of carboxylic acids as a modifier for barium titanate nanoparticles on the performance of poly(vinylidene fluoride)-based nanocomposites for energy storage applications . | PHYSICAL CHEMISTRY CHEMICAL PHYSICS , 2018 , 20 (9) , 6598-6605 .
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Enhancement of light extraction by ZnO nanostructures on vertical GaN light emitting diodes EI CPCI-S
会议论文 | 2018 , 10823 | Conference on Nanophotonics and Micro/Nano Optics IV
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Abstract :

Controllable growth of ZnO nanostructures were realized on the surface patterned vertical-type GaN light emitting diodes (LEDs) by chemical solution method at low temperature. Aqueous ammonia has been added to manipulate the pH values of the growth solution to optimize the morphology of the ZnO nanostructures and light extraction efficiency from GaN LED surface. It is revealed that ZnO nanostructures were mainly grown on the tips of the GaN surface pyramids at pH value of 8.5. With decreasing pH value, ZnO nanostructures were observed grown both on tip and bottom of the GaN pyramids. On the contrary, the growth of ZnO nanostructures was greatly inhibited by increasing pH value above 10. The electroluminescence (EL) spectra intensity was enhanced by 40% for GaN LEDs topped with ZnO nanostructures at pH value of 8.5. This enhancement is attributed to the ZnO nanostructures tip-grown on vertical GaN LEDs effectively reducing the total internal reflection and minimizing Fresnel loss.

Keyword :

nanostructures Solid-state lighting GaN extraction efficiency surface texturing light emitting diodes

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GB/T 7714 Li, Yuanjie , Sun, Wenci , Wang, Hong et al. Enhancement of light extraction by ZnO nanostructures on vertical GaN light emitting diodes [C] . 2018 .
MLA Li, Yuanjie et al. "Enhancement of light extraction by ZnO nanostructures on vertical GaN light emitting diodes" . (2018) .
APA Li, Yuanjie , Sun, Wenci , Wang, Hong , Zhang, Minyan , Yun, Feng . Enhancement of light extraction by ZnO nanostructures on vertical GaN light emitting diodes . (2018) .
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Ultra-low temperature sintering and microwave dielectric properties of a novel temperature stable Na2Mo2O7-Na0.5Bi0.5MoO4 ceramic EI SCIE Scopus
期刊论文 | 2018 , 38 (2) , 813-816 | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
WoS CC Cited Count: 5 SCOPUS Cited Count: 10
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Abstract :

The novel ultra-low temperature sintering (1-x)Na(2)Mo(2)O(7-)xNa(0.5)Bi(0.5)MoO(4) ceramics have been obtained via solid-state reaction method for passive integration use. The Na2Mo2O7 and Na0.5Bi0.5MoO4 crystal phases are found to be compatible with each other from the results of XRD and SEM-EDS. With the x value changing from 0.36 to 1.00, the epsilon(r) increases from 16.0 to 32.0 and the tau(f) value varies from -58 to 47 ppm/degrees C. At x = 0.75, the 0.25Na(2)Mo(2)O(7)-0.75Na(0.5)Bi(0.5)MoO(4) ceramic sintered at an ultra-low sintering temperature of 580 degrees C can be densified ( > 96%) and possesses good microwave dielectric properties of an epsilon(r) of 24.0, a Q x f value of 13,000 GHz (at 6.2 GHz), and a tau(f) value of 3 ppm/degrees C. The theoretical epsilon(r) and tau(f) of the (1-x)Na2Mo2O7-xNa(0.5)Bi(0.5)MoO(4) composites were calculated using the mixing law and in accordance with the measured values.

Keyword :

Ultra-low temperature sintering Microwave dielectric properties Dielectrics Temperature stable material Ceramics

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GB/T 7714 Zhang, Gaoqun , Guo, Jing , Yuan, Xiaofeng et al. Ultra-low temperature sintering and microwave dielectric properties of a novel temperature stable Na2Mo2O7-Na0.5Bi0.5MoO4 ceramic [J]. | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY , 2018 , 38 (2) : 813-816 .
MLA Zhang, Gaoqun et al. "Ultra-low temperature sintering and microwave dielectric properties of a novel temperature stable Na2Mo2O7-Na0.5Bi0.5MoO4 ceramic" . | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY 38 . 2 (2018) : 813-816 .
APA Zhang, Gaoqun , Guo, Jing , Yuan, Xiaofeng , Wang, Hong . Ultra-low temperature sintering and microwave dielectric properties of a novel temperature stable Na2Mo2O7-Na0.5Bi0.5MoO4 ceramic . | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY , 2018 , 38 (2) , 813-816 .
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Ultrahigh energy density and greatly enhanced discharged efficiency of sandwich-structured polymer nanocomposites with optimized spatial organization EI SCIE Scopus
期刊论文 | 2018 , 44 , 364-370 | NANO ENERGY
WoS CC Cited Count: 18 SCOPUS Cited Count: 26
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Abstract :

Sandwich-structured polymer nanocomposites that provide a pathway to overcome the paradox between permittivity and breakdown strength ever existing in dielectric materials are receiving increasing attentions for their superior energy storage performance. Despite certain advances obtained in previous effort, further enhancement of the energy density by structure optimizing is still a challenge. Herein, we present a newly designed sandwich-structured barium titanate/poly(vinylidene fluoride-co-hexafluoropropylene) (BaTiO3/P(VDF-HFP)) nanocomposite via layer-by-layer tape casting process, where high contents of BaTiO3 nanoparticles are dispersed in the middle layer to offer high permittivity, while two outer layers containing small amounts of BaTiO3 provide favorable breakdown strength. The solution-processed nanocomposites with an optimal composition exhibits an ultrahigh discharged energy density of 26.4 J cm(-3) and a superior discharged efficiency of 72%, which are by far the highest values ever achieved in sandwich-structured dielectric polymer composites. It is revealed that the designed structure can enhance the breakdown strength and discharged efficiency by preventing the charge injection from electrodes and impeding the development of electrical tress during breakdown process, as confirmed by the leakage current and thermally stimulated depolarization current measurements, as well as the finite element simulations. This work represents a new design paradigm to exploit advanced dielectric materials for electrical energy storage applications.

Keyword :

Dielectric breakdown Sandwich structure Electrical energy storage Capacitor Polymer nanocomposites

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GB/T 7714 Wang, Yifei , Wang, Linxi , Yuan, Qibin et al. Ultrahigh energy density and greatly enhanced discharged efficiency of sandwich-structured polymer nanocomposites with optimized spatial organization [J]. | NANO ENERGY , 2018 , 44 : 364-370 .
MLA Wang, Yifei et al. "Ultrahigh energy density and greatly enhanced discharged efficiency of sandwich-structured polymer nanocomposites with optimized spatial organization" . | NANO ENERGY 44 (2018) : 364-370 .
APA Wang, Yifei , Wang, Linxi , Yuan, Qibin , Chen, Jie , Niu, Yujuan , Xu, Xinwei et al. Ultrahigh energy density and greatly enhanced discharged efficiency of sandwich-structured polymer nanocomposites with optimized spatial organization . | NANO ENERGY , 2018 , 44 , 364-370 .
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Multifunctional hydrogel enables extremely simplified electrochromic devices for smart windows and ionic writing boards EI SCIE Scopus
期刊论文 | 2018 , 5 (5) , 1000-1007 | MATERIALS HORIZONS
SCOPUS Cited Count: 1
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A much simplified electrochromic structure is designed based on a multifunctional ionic hydrogel. The three-layered structure exhibits significant color change with large transmittance modulation and high coloration efficiency. Moreover, an ionic writing board is developed with the hydrogel to realize the first rewritable electrochromic display.

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GB/T 7714 Fang, Huajing , Zheng, Pengyue , Ma, Rong et al. Multifunctional hydrogel enables extremely simplified electrochromic devices for smart windows and ionic writing boards [J]. | MATERIALS HORIZONS , 2018 , 5 (5) : 1000-1007 .
MLA Fang, Huajing et al. "Multifunctional hydrogel enables extremely simplified electrochromic devices for smart windows and ionic writing boards" . | MATERIALS HORIZONS 5 . 5 (2018) : 1000-1007 .
APA Fang, Huajing , Zheng, Pengyue , Ma, Rong , Xu, Chen , Yang, Gaiying , Wang, Qing et al. Multifunctional hydrogel enables extremely simplified electrochromic devices for smart windows and ionic writing boards . | MATERIALS HORIZONS , 2018 , 5 (5) , 1000-1007 .
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Highly Stable In-Plane Microwave Magnetism in Flexible Li0.35Zn0.3Fe2.35O4(111) Epitaxial Thin Films for Wearable Devices EI SCIE PubMed Scopus
期刊论文 | 2018 , 10 (38) , 32331-32336 | ACS APPLIED MATERIALS & INTERFACES
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With the advances in artificial intelligence and communication technologies, flexible microwave magnetic materials have become essential for flexible microwave detectors, wearable microwave sensors, and flexible spintronics. Here, a highly stable in-plane (IP) ferromagnetic resonance (FMR) and a tunable out-of-plane (OOP) FMR character are demonstrated in the flexible microwave magnetic Li0.35Zn0.3Fe2.35O4 (LZFO) (1 1 1) epitaxial thin films under external mechanical bending. Both the IP FMR line width and resonance field (H-r) are basically unchanged when the sample was bent under an external tensile or compressive bending strain and deformation. However, the OOP FMR spectra (including H-r and absorption peak) could be tuned by mechanical bending, i.e., the LZFO sample possesses two OOP FMR absorption peaks at an external bending curvature. Meanwhile, excellent mechanical antifatigue and mechanical retention characteristics have also been obtained in the LZFO sample. The highly stable IP and the tunable OOP FMR spectra in the same LZFO sample with excellent mechanical antifatigue character have a promising prospect in microwave magnetic devices and flexible spintronics.

Keyword :

wearable devices epitaxial thin films lithium zinc ferrites flexible sensors microwave magnetism

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GB/T 7714 Liu, Wenlong , Ma, Rong , Liu, Ming et al. Highly Stable In-Plane Microwave Magnetism in Flexible Li0.35Zn0.3Fe2.35O4(111) Epitaxial Thin Films for Wearable Devices [J]. | ACS APPLIED MATERIALS & INTERFACES , 2018 , 10 (38) : 32331-32336 .
MLA Liu, Wenlong et al. "Highly Stable In-Plane Microwave Magnetism in Flexible Li0.35Zn0.3Fe2.35O4(111) Epitaxial Thin Films for Wearable Devices" . | ACS APPLIED MATERIALS & INTERFACES 10 . 38 (2018) : 32331-32336 .
APA Liu, Wenlong , Ma, Rong , Liu, Ming , Wang, Hong . Highly Stable In-Plane Microwave Magnetism in Flexible Li0.35Zn0.3Fe2.35O4(111) Epitaxial Thin Films for Wearable Devices . | ACS APPLIED MATERIALS & INTERFACES , 2018 , 10 (38) , 32331-32336 .
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Multilayered ferroelectric polymer films incorporating low-dielectric-constant components for concurrent enhancement of energy density and charge?discharge efficiency EI Scopus SCIE
期刊论文 | 2018 , 54 , 288-296 | Nano Energy
WoS CC Cited Count: 1 SCOPUS Cited Count: 2
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Ferroelectric polymers are the materials of choice for capacitive energy storage owing to their highest dielectric constants (K) and the best energy densities among the current dielectric polymers. Herein, different from the conventional approaches based on the incorporation of high-K fillers into the single-layer films to enhance the capacitive performance, a low-K polymer, i.e. PMMA with a K value of 3–4, is selected as an example and introduced into the layered configurations of the ferroelectric polymer. Both improvements in the energy density (Ue) and charge–discharge efficiency (η) over those of the pristine polymer have been achieved via the establishment of multiple interlaminar interfaces and modulation of component ratios. The influence of film configuration on the capacitive performance has been systematically studied. The trilayered all-polymer film with optimized component ratio is capable of operating with a charge–discharge efficiency as high as 84% and concurrently delivering an energy density up to 20.3 J cm−3, surpassing the capacitive performance of the currently available polymer dielectrics that present the upper limits of Ue of ~20 J cm−3 and η of ~80%. Along with excellent stability of dielectric and mechanical properties of the polymer films, this work suggests great potential of the multicomponent ferroelectric polymers with layered architecture for electrical energy storage applications. © 2018 Elsevier Ltd

Keyword :

Capacitive energy storage Capacitive performance Dielectric constants (k) Electrical energy storages Ferroelectric polymer films Ferroelectric polymers Low dielectric constants Power densities

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GB/T 7714 Chen, Jie , Wang, Yifei , Yuan, Qibin et al. Multilayered ferroelectric polymer films incorporating low-dielectric-constant components for concurrent enhancement of energy density and charge?discharge efficiency [J]. | Nano Energy , 2018 , 54 : 288-296 .
MLA Chen, Jie et al. "Multilayered ferroelectric polymer films incorporating low-dielectric-constant components for concurrent enhancement of energy density and charge?discharge efficiency" . | Nano Energy 54 (2018) : 288-296 .
APA Chen, Jie , Wang, Yifei , Yuan, Qibin , Xu, Xinwei , Niu, Yujuan , Wang, Qing et al. Multilayered ferroelectric polymer films incorporating low-dielectric-constant components for concurrent enhancement of energy density and charge?discharge efficiency . | Nano Energy , 2018 , 54 , 288-296 .
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