A surface-modified TiO<sub>2</sub> nanorod array/P(VDF–HFP) dielectric capacitor with ultra high energy density and efficiency

Liao, Shudi; Shen, Zhonghui; Pan, Hao; Zhang, Xin; Shen, Yang; Lin, Yuanhua; Chen, Nan

doi:10.1039/c7tc04170e

Cited by 67 publications

(44 citation statements)

References 41 publications

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“…Besides, the morphology of TiO 2 nanowire arrays indicates large and orderly distributed interface with polymer, contributing to the Maxwell–Wagner–Sillars (MWS) polarization, a spatial charge polarization, which refers to the higher concentration of charges on the interface between two different phases due to the difference in electric conductivity. The interface in the composite provides path along the electric field for space interface charges, and contributes to the high dielectric constant [ 34 , 35 , 36 ]. The β-phase of the P(VDF-TrFE) matrix with a higher electric dipole moment than the α-phase also contributes to the high permittivity.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Dielectric and Hydrophobic Properties of Poly(vinylidene fluoride-trifluoroethylene)/TiO2 Nanowire Arrays Composite Film Surface Modified by Electrospinning

Shen

Zhang

et al. 2020

Polymers

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In this research, we designed a feasible method to prepare composite films with high permittivity and significantly enhanced hydrophobic performance, which showed huge potential in the electrowetting field. TiO2 nanowire arrays were prepared by a one-step hydrothermal process, and poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) was spin-coated on the nanowire arrays to form composite, the surface of which was modified by electrospinning. Due to the great orientation of TiO2 nanowires, dipoles and space charges are in ordered arrangement along the electric field, and this strongly reinforced the Maxwell–Wagner–Sillars (MWS) polarization, thus the permittivity of the composite (TiO2 nanowire length/film thickness is 0.769) reaches 53 at 1 kHz, which is nearly 3 times higher than pure P(VDF-TrFE). Meanwhile the composite film possesses low dielectric loss (0.07) and low conductivity (2.69 × 10−9 S/cm), showing good insulation. The contact angle of the composite after electrospinning (about 137°) was greatly enhanced from pure P(VDF-TrFE) spin-coated film (about 89°), which can be attributed to the microrough structure built by P(VDF-TrFE) nanofibers.

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Section: Resultsmentioning

confidence: 99%

Enhanced Dielectric and Hydrophobic Properties of Poly(vinylidene fluoride-trifluoroethylene)/TiO2 Nanowire Arrays Composite Film Surface Modified by Electrospinning

Shen

Zhang

et al. 2020

Polymers

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“…Recent studies have shown that one-dimensional nanofillers with large aspect ratio, such as TiO 2 6 , BaTiO 3 20 , 21 , BaSrTiO 3 22 , 23 , and SrTiO 3 24 , are more effective than the nanoparticles counterparts in improving the permittivity and energy density of the dielectric NCs. One-dimensional nanofillers with a large aspect ratio can effectively alleviate the conflict between the raise of permittivity and the decline of breakdown strength.…”

Section: Introductionmentioning

confidence: 99%

“…Dielectric capacitors with the ultrafast charging and discharging speeds, high power density and low cost are very attractive materials for the potential applications in the pulsed power electronic devices, such as radars, lasers, rail guns, and medical defibrillators [1][2][3][4][5][6][7] . However, the dielectric capacitors have lower energy density than batteries, fuel cells, and double-layer supercapacitors so this type of energy storage device is still expensive and bulky [8][9][10][11][12] .…”

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confidence: 99%

Enhanced energy density of PVDF-based nanocomposites via a core–shell strategy

Chu

et al. 2020

Sci Rep

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In recent years, high energy density polymer capacitors have attracted a lot of scientific interest due to their potential applications in advanced power systems and electronic devices. Here, core–shell structured TiO2@SrTiO3@polydamine nanowires (TiO2@SrTiO3@PDA NWs) were synthesized via a combination of surface conversion reaction and in-situ polymerization method, and then incorporated into the poly(vinylidene fluoride) (PVDF) matrix. Our results showed that a small amount of TiO2@SrTiO3@PDA NWs can simultaneously enhance the breakdown strength and electric displacement of nanocomposite (NC) films, resulting in improved energy storage capability. The 5 wt% TiO2@SrTiO3@PDA NWs/PVDF NC demonstrates 1.72 times higher maximum discharge energy density compared to pristine PVDF (10.34 J/cm3 at 198 MV/m vs. 6.01 J/cm3 at 170 MV/m). In addition, the NC with 5 wt% TiO2@SrTiO3@PDA NWs also demonstrates an excellent charge–discharge efficiency (69% at 198 MV/m). Enhanced energy storage performance is due to hierarchical interfacial polarization among their multiple interfaces, the large aspect ratio as well as surface modification of the TiO2@SrTiO3 NWs. The results of this study provide guidelines and a foundation for the preparation of the polymer NCs with an outstanding discharge energy density.

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“…Due to the poor wettability between polymer and ceramics, these approaches cannot really improve the compatibility between the constituents of the composites. Although the uniformity of the polymer‐based composites can be significantly improved, the wettability between matrix and fillers does not change; additionally, it should be mentioned that both the hot‐pressing and spin‐coating are not desirable for many applications because they lead to a much more complex fabrication process . A simple fabrication process is demanded for a uniform microstructure and a better compatibility of polymer‐based composites.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of flexible, free‐standing, and easy‐fabricating BaTiO₃‐P(VDF‐CTFE) dielectric nanocomposite

Tong

Li²,

Liu

et al. 2019

Polymer Composites

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The flexible and free‐standing nanocomposite films were fabricated by a simple solution‐casting process using BaTiO3 nanoparticles as fillers and P(VDF‐CTFE) 91/9 mol% as polymer matrix. To obtain good wettability between ceramic and polymer, the coupling agent 3‐Aminopropyltriethoxysilane was used to modify the surface of BaTiO3 fillers. A good compatibility of BaTiO3 and P(VDF‐CTFE) was achieved when a small amount of coupling agent was used for the surface modification of BaTiO3 fillers; therefore, the nanocomposites with a dense and uniform microstructure was obtained. It was experimentally found that both dielectric constant and breakdown strength were increased with a suitable amount of coupling agent due to the good compatibility. A dielectric constant of 51 at 1 kHz was obtained with 30 vol% fillers and 2 wt% coupling agent, which was about four times of that for the pure P(VDF‐CTFE) film. When an appropriate amount of coupling agent was coated on fillers, the energy storage density of the composite system was improved. A maximal discharge energy‐storage density of 3.8 J/cm3 was obtained for the nanocomposite film with 5 vol% of BaTiO3 and 2 wt% coupling agent, which is much higher than that of the composites without coupling agent.

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A surface-modified TiO₂ nanorod array/P(VDF–HFP) dielectric capacitor with ultra high energy density and efficiency

Abstract: A surface-modified TiO2 nanorod array/P(VDF–HFP) dielectric capacitor has an ultrahigh energy density of 17.5 J cm−3 at 509 kV mm−1.

Cited by 67 publications

References 41 publications

Enhanced Dielectric and Hydrophobic Properties of Poly(vinylidene fluoride-trifluoroethylene)/TiO2 Nanowire Arrays Composite Film Surface Modified by Electrospinning

Enhanced Dielectric and Hydrophobic Properties of Poly(vinylidene fluoride-trifluoroethylene)/TiO2 Nanowire Arrays Composite Film Surface Modified by Electrospinning

Enhanced energy density of PVDF-based nanocomposites via a core–shell strategy

Preparation and characterization of flexible, free‐standing, and easy‐fabricating BaTiO₃‐P(VDF‐CTFE) dielectric nanocomposite

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A surface-modified TiO2 nanorod array/P(VDF–HFP) dielectric capacitor with ultra high energy density and efficiency

Abstract: A surface-modified TiO2 nanorod array/P(VDF–HFP) dielectric capacitor has an ultrahigh energy density of 17.5 J cm−3 at 509 kV mm−1.

Cited by 67 publications

References 41 publications

Enhanced Dielectric and Hydrophobic Properties of Poly(vinylidene fluoride-trifluoroethylene)/TiO2 Nanowire Arrays Composite Film Surface Modified by Electrospinning

Enhanced Dielectric and Hydrophobic Properties of Poly(vinylidene fluoride-trifluoroethylene)/TiO2 Nanowire Arrays Composite Film Surface Modified by Electrospinning

Enhanced energy density of PVDF-based nanocomposites via a core–shell strategy

Preparation and characterization of flexible, free‐standing, and easy‐fabricating BaTiO3‐P(VDF‐CTFE) dielectric nanocomposite

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Product

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About

A surface-modified TiO₂ nanorod array/P(VDF–HFP) dielectric capacitor with ultra high energy density and efficiency

Preparation and characterization of flexible, free‐standing, and easy‐fabricating BaTiO₃‐P(VDF‐CTFE) dielectric nanocomposite