Bilayer structured PVDF-based composites via integrating BaTiO3 nanowire arrays and BN nanosheets for high energy density capacitors

Ru, Guo; Luo, Hang; Zhai, Di; Xiao, Zhida; Xie, Haoran; Liu, Yuan; Zhou, Xuefan

doi:10.1016/j.cej.2022.135497

Cited by 54 publications

(34 citation statements)

References 41 publications

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“…Typical mechanisms including space charge-limited conduction, hopping conduction, Poole–Frenkel, Schottky and Fowler–Nordheim are present in the leakage conduction of dielectrics under high electric fields. 50 The variation of current density with electric field for pristine PEI, S-15 and S-15-28 are shown in Fig. 5©.…”

Section: Resultsmentioning

confidence: 99%

Ultrahigh energy storage performance of all-organic dielectrics at high-temperature by tuning the density and location of traps

Feng

Zhang

et al. 2022

Mater. Horiz.

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Section: Resultsmentioning

confidence: 99%

Ultrahigh energy storage performance of all-organic dielectrics at high-temperature by tuning the density and location of traps

Feng

Zhang

et al. 2022

Mater. Horiz.

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“…In addition, the edge-sharing octahedron is driven to the point-sharing octahedron during topological chemical transformation. Therefore, H 2 Ti 3 O 7 nanowires were successfully transformed into BTO NWs. , Figure a diagrammatically represents the changes in molecular structure during their synthesis. In general, the crystallizations of BTO NWs play an important role in piezoelectric properties due to their ordered arrangement.…”

Section: Resultsmentioning

confidence: 99%

Piezoelectric Nanogenerators Based on Electrospun PVDF-Coated Mats Composed of Multilayer Polymer-Coated BaTiO₃ Nanowires

Zhao

Chen

Cheng

et al. 2022

ACS Appl. Nano Mater.

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With the surge in demand for green energy, nanocomposites composed of piezoelectric polymers and nano-piezoelectric ceramics show great prospects in preparing excellent performance piezoelectric nanogenerators (PENGs). However, the agglomeration of the piezoelectric enhancement phase and the low degree of polarization significantly impair the piezoelectric properties of the nanofibers; thus, the output performance of PENGs is severely limited. In this work, barium titanate nanowires piezoelectric ceramics were synthesized by the hydrothermal method. By surface-initiated polymerization, the hyperbranched barium titanate nanowire was surface-grafted with poly(methyl methacrylate) (PMMA). The high dielectric constant and low dielectric loss of hyperbranched polymers lead to higher β-phase content in electrospun nanofilms and suppress current leakage. The PMMA coating results in the uniform dispersion of BaTiO3 nanowires in poly(vinylidene fluoride) (PVDF), thereby enhancing the piezoelectric performance of the fiber nanocomposite PENG. The open circuit voltage and short circuit current of the PENG composed of PVDF and core-double shell PMMA-coated hyperbranched BaTiO3 (BTO@HBP@PMMA) nanowires can reach 3.4 V and 0.32 μA, and the peak output power is 5.25 μW, which is significantly improved compared to that of the unmodified PENG. Furthermore, the flexible PENG has high durability and can continuously generate stable piezoelectric signals for 6000 cycles without decay. The prepared PENG can also efficiently harvest the energy generated by human daily activities. In general, this study provides a new microstructure design for the fabrication of high performance PENGs.

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“…From Figure d, the leakage current density of the PBP is lower than that of BPB at 100 MV/m. Generally, the leakage current is caused by the migration of carriers within the nanocomposite and charges injected from the electrode . Therefore, compared to BPB, the lower leakage current density of PBP may be attributed to the outer P-layer effectively suppressing the charges injected from the Au electrode, which is expected to evaluate by the surface charge density of the P-layer and B-layer. , …”

Section: Resultsmentioning

confidence: 99%

“…Generally, the leakage current is caused by the migration of carriers within the nanocomposite and charges injected from the electrode. 44 Therefore, compared to BPB, the lower leakage current density of PBP may be attributed to the outer P-layer effectively suppressing the charges injected from the Au electrode, which is expected to evaluate by the surface charge density of the P-layer and B-layer. 17,45 The cross-sectional schematic diagram of charge injection at the electrode/dielectric interface of PBP and BPB nanocomposites is revealed in Figure 5a,b, and the surface charge density σ of dielectrics can be ascertained by the following Formula 4 46 1.77 10 13…”

Section: Resultsmentioning

confidence: 99%

Significantly Enhanced Breakdown Strength and Energy Density in Nanocomposites by Synergic Modulation of Structural Design and Low-Loading Nanofibers

Wang

et al. 2022

ACS Appl. Mater. Interfaces

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Polymer-based dielectric nanocomposites have attracted great attention due to the advantages of high-power density and stability. However, due to the limited breakdown strength (E b) of the dielectrics, the unsatisfactory energy density becomes the bottleneck that restricts their applications. Here, newly designed sandwich-structured nanocomposites are proposed, which includes the introduction of low-loading 0.4BiFeO3–0.6SrTiO3 (BFSTO) nanofibers into the poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-HFP)) matrix as the polarization layer (B-layer) to offer high permittivity and the selection of poly(methylmethacrylate) (PMMA)/P(VDF-HFP) all-organic blend film as the insulation layer (P-layer) to improve E b of the nanocomposites. The optimized sandwich-structured PBP nanocomposite exhibits significant enhancement in E b (668.6 MV/m), generating a discharged energy density of 17.2 J/cm3. The dielectric and Kelvin probe force microscope results corroborate that the outer P-layer has a low surface charge density, which can markedly impede the charge injection from the electrode/dielectric interface and thereby suppress the leakage current inside the nanocomposite. Furthermore, both the finite element simulations and capacitive series models demonstrate that the homogenized distribution of electric field in the PBP sandwich-structured nanocomposite favors the improvement of energy storage performance. This work not only provides insightful guidance into the in-depth understanding of the dielectric breakdown mechanism in sandwich-structured nanocomposites but also offers a novel paradigm for the development of polymer-based nanocomposites with high E b and discharged energy density.

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Bilayer structured PVDF-based composites via integrating BaTiO3 nanowire arrays and BN nanosheets for high energy density capacitors

Cited by 54 publications

References 41 publications

Ultrahigh energy storage performance of all-organic dielectrics at high-temperature by tuning the density and location of traps

Ultrahigh energy storage performance of all-organic dielectrics at high-temperature by tuning the density and location of traps

Piezoelectric Nanogenerators Based on Electrospun PVDF-Coated Mats Composed of Multilayer Polymer-Coated BaTiO₃ Nanowires

Significantly Enhanced Breakdown Strength and Energy Density in Nanocomposites by Synergic Modulation of Structural Design and Low-Loading Nanofibers

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Bilayer structured PVDF-based composites via integrating BaTiO3 nanowire arrays and BN nanosheets for high energy density capacitors

Cited by 54 publications

References 41 publications

Ultrahigh energy storage performance of all-organic dielectrics at high-temperature by tuning the density and location of traps

Ultrahigh energy storage performance of all-organic dielectrics at high-temperature by tuning the density and location of traps

Piezoelectric Nanogenerators Based on Electrospun PVDF-Coated Mats Composed of Multilayer Polymer-Coated BaTiO3 Nanowires

Significantly Enhanced Breakdown Strength and Energy Density in Nanocomposites by Synergic Modulation of Structural Design and Low-Loading Nanofibers

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Piezoelectric Nanogenerators Based on Electrospun PVDF-Coated Mats Composed of Multilayer Polymer-Coated BaTiO₃ Nanowires