Core-shell structured CaCO3@CNF for enhanced dielectric properties of polymer nanocomposites

Zhang, Quanping; Zhu, Wen-Fan; Liang, Dong-Ming; Wu, Xiaoli; Chen, Rui-Chao; Sun, Nan; Li, Yintao; Zhou, Yanyan

doi:10.1016/j.apsusc.2019.05.060

Cited by 20 publications

(7 citation statements)

References 36 publications

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“…Our results were in agreement with the study by Liu that also found that the most photoactive species was the superoxide radical [55], unlike the findings in other materials [10,[56][57][58]. XRD and TG/DTA analyses indicated the presence of Ca(OH) 2 and CaCO 3 , which were dielectric [59,60]. Sanchez-Cantu verified that Ca(OH) 2 , with a 5.69 eV band gap, presented high photoactivity attributed to the indirect sensitization of Rhodamine 6G dye.…”

Section: Photoactivity Of Catalysts For Rhb Discolorationsupporting

confidence: 91%

Correlation of photocatalytic activity and defects generated in Ca2+-based heterojunctions

et al. 2020

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In this work a new semiconductor based on calcium heterojunction (CaO/CaTiO 3 ) was evaluated to the optical properties correlated to crystalline lattice defects. The heterojunctions of the semiconductor were prepared by the sol-gel route and its formation was confirmed by the intimate contact interface between crystalline phases. Morphology and elemental composition of the nanometric heterojunction were evaluated. Chemical environment and composition of the surface were used to determine the oxidation state of the material constituents. The electronic structure was evaluated and the relationship among band gap energy, photoluminescent emission energy, and photocatalytic activity of the materials was demonstrated. Oxygen vacancies located on the surface promoted photoluminescent spectra emission in the green wavelength, making them more photoactive than those defects that emitted in the red region. The use of active species scavenger indicated that the photogenerated species with the greatest photocatalytic action was the superoxide radical. This study has developed calcium heterojunctions for application as photocatalysts, demonstrating the importance of the defects generated in the production of heterojunctions and the activity of photogenerated species, studied using scavengers.

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Section: Photoactivity Of Catalysts For Rhb Discolorationsupporting

confidence: 91%

Correlation of photocatalytic activity and defects generated in Ca2+-based heterojunctions

et al. 2020

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“…However, the huge dielectric constant difference between organic matrix and inorganic fillers will weaken the breakdown electric field strength, and researchers proposed some feasible solutions by adding intermediate dielectric transition layers 34–40 . Chi et al 39 prepared BT NFs with different aspect ratios and wrapped SiO 2 shell layers of appropriate thickness to form a core‐shell structure.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of the dielectric energy storage performance of PVDF‐TrFE composite film via core‐shell structured (1‐x)Ba(Ti_0.8Zr_0.2)O₃‐x(Ba_0.7Ca_0.3)TiO₃@TiO₂

Ding

Zhang

Zou

et al. 2023

J of Applied Polymer Sci

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PVDF-based materials have gained significant attention in the field of dielectric energy storage due to their excellent breakdown strength and energy storage density. However, the improvement has been limited by their low dielectric constant. In this article, the PVDF-TrFE composite films with core-shell structured (1-x)Ba(Ti 0.8 Zr 0.2 )O 3 -x(Ba 0.7 Ca 0.3 )TiO 3 @TiO 2 (BZT-xBCT@TiO 2 ) nanofibers were fabricated using hot pressing, electrospinning, and hydrothermal method. Doping the PVDF-TrFE composite film with 3 wt% BZT-0.6BCT increased its energy storage density to 14.2 JÁcm À3 . When the doped ceramic fibers were coated with the TiO 2 core-shell of $75 nm, the composite film exhibits improved breakdown field strength (E b ) of 365 kV mm À1 , enhanced energy storage density (U e ) of 18.71 JÁcm À3 , and superior energy storage efficiency (η) of 60.03%.

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“… 21 To increase the dielectric constant, the loading level of fillers are supposed to be as high as possible in the composites. 29 , 30 Furthermore, there is a huge dielectric constant mismatch between the polymers (usually < 10) and fillers (usually > 1000), which brings the problem of the local concentration of electric field distribution. 11 , 31 − 33 As a result, the breakdown strength and energy density of the dielectric composites are seriously limited.…”

Section: Introductionmentioning

confidence: 99%

“…One of the effective strategies is to prepare polymer-based composites with ceramics or conductive fillers. − This method can indeed achieve an increase in dielectric constant due to the contribution of the high dielectric constant of inorganic fillers and enhanced interfacial polarization through improved interface area. − However, not only the increased dielectric constant is based on sacrificing the breakdown strength of composites but also the flexibility of the polymer matrix is destroyed by the fillers . To increase the dielectric constant, the loading level of fillers are supposed to be as high as possible in the composites. , Furthermore, there is a huge dielectric constant mismatch between the polymers (usually < 10) and fillers (usually > 1000), which brings the problem of the local concentration of electric field distribution. ,− As a result, the breakdown strength and energy density of the dielectric composites are seriously limited.…”

Section: Introductionmentioning

confidence: 99%

High Breakdown Strength and Energy Density in Multilayer-Structured Ferroelectric Composite

et al. 2020

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All-organic dielectric composites are drawing increased attention owing to their high operating voltage, low loss, and superior processability. However, polymers usually possess a relatively lower dielectric constant than most the other dielectrics, which seriously suppresses the improvement of their energy density. In this work, multilayer-structured composites with excellent dielectric and energy storage properties are prepared by the stacking method, and the effect of layer numbers on the performance of the composites is studied. High-κ polymers such as poly(vinylidenefluoride) (PVDF) and poly(vinylidenefluoride-ter-trifluoroethylene-ter-chlorotrifluoroethylene) (P(VDF-TrFE-CTFE)) are used to prepare the composites with different layers. It is found that the dielectric constant is up to 14.45 at 1 kHz, which is increased with the volume fraction of the P(VDF-TrFE-CTFE) layer and layer number of the composites. Due to the increased dielectric constant, an ultrahigh discharge energy density of 18.12 J/cm 3 is achieved at the electric field of 620 kV/mm. This study exhibits an effective routine to prepare flexible high-performance dielectric materials.

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Core-shell structured CaCO3@CNF for enhanced dielectric properties of polymer nanocomposites

Cited by 20 publications

References 36 publications

Correlation of photocatalytic activity and defects generated in Ca2+-based heterojunctions

Correlation of photocatalytic activity and defects generated in Ca2+-based heterojunctions

Enhancement of the dielectric energy storage performance of PVDF‐TrFE composite film via core‐shell structured (1‐x)Ba(Ti_0.8Zr_0.2)O₃‐x(Ba_0.7Ca_0.3)TiO₃@TiO₂

High Breakdown Strength and Energy Density in Multilayer-Structured Ferroelectric Composite

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Core-shell structured CaCO3@CNF for enhanced dielectric properties of polymer nanocomposites

Cited by 20 publications

References 36 publications

Correlation of photocatalytic activity and defects generated in Ca2+-based heterojunctions

Correlation of photocatalytic activity and defects generated in Ca2+-based heterojunctions

Enhancement of the dielectric energy storage performance of PVDF‐TrFE composite film via core‐shell structured (1‐x)Ba(Ti0.8Zr0.2)O3‐x(Ba0.7Ca0.3)TiO3@TiO2

High Breakdown Strength and Energy Density in Multilayer-Structured Ferroelectric Composite

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Enhancement of the dielectric energy storage performance of PVDF‐TrFE composite film via core‐shell structured (1‐x)Ba(Ti_0.8Zr_0.2)O₃‐x(Ba_0.7Ca_0.3)TiO₃@TiO₂