Abstract
One-dimensional inorganic high-k nanowires (NWs) show a potential of achieving high energy densities in polymer-matrix nanocomposite capacitors. In this study, we investigate a hydrothermal synthesis of BT NWs, by which BT NWs with high aspect ratios of pure phase, [110]-oriented structures were obtained. The BT NWs are filled in a polyvinylidene fluoride (PVDF) matrix to prepare nanocomposites and their dielectric and energy storage properties are investigated. An enhanced dielectric constant of εr ~ 58 at 100 Hz is achieved in PVDF–BaTiO3 NWs (30 vol%), while the value is 47 for a traditional composite filled with BT nanoparticles (NPs). Besides, high breakdown strength of Eb > 362 MV/m is also achieved in the composites. PVDF–BaTiO3 NWs nanocomposite exhibits a high discharged energy density of Ud ~ 12.85 J/cm3 at 300 MV/m at 100 Hz with a discharge efficiency of 58%. The simulation from the finite element analysis on distributions of voltage and electric displacement is studied and showed the consistency with experimental results. This study demonstrates a facile and large-scale route to the synthesis of BaTiO3 NWs for making high εr, Eb and Ud nanocomposite capacitors.
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Jian, G., Jiao, Y., Meng, Q. et al. Hydrothermal synthesis of BaTiO3 nanowires for high energy density nanocomposite capacitors. J Mater Sci 55, 6903–6914 (2020). https://doi.org/10.1007/s10853-020-04520-x
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DOI: https://doi.org/10.1007/s10853-020-04520-x