Significantly enhanced energy storage density for poly(vinylidene fluoride) composites by induced PDA-coated 0.5Ba(Zr0.2Ti0.8)O3–0.5(Ba0.7Ca0.3)TiO3 nanofibers. Issue 32 (26th July 2017)

• Record Type: Journal Article
• Authors: Chi, Qingguo; Ma, Tao; Zhang, Yue; Cui, Yang; Zhang, Changhai; Lin, Jiaqi; Wang, Xuan; Lei, Qingquan
• Is Part Of: Journal of materials chemistry. Volume 5:Issue 32(2017)
• Page Start: 16757
• Page End: 16766
• Publication Date: 2017-07-26
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c7ta03897f
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : The significantly enhanced energy storage characteristics of 0.5Ba(Zr0.2 Ti0.8 )O3 –0.5(Ba0.7 Ca0.3 )TiO3 nanofibers/PVDF dielectric composites with low doping ratios and large aspect ratio nanofillers. Abstract : In this study, high aspect ratio TiO2 nanofibers (TiO2 NFs), BaTiO3 nanofibers (BT NFs), CaCu3 Ti4 O12 nanofibers (CCTO NFs) and 0.5Ba(Zr0.2 Ti0.8 )O3 –0.5(Ba0.7 Ca0.3 )TiO3 nanofibers (BZT-BCT NFs) were prepared via an electrospinning technique. The nanofibers have been modified with polydopamine (PDA), which exhibited excellent dispersion and good compatibility with the polymer matrix. The effects of the structure and morphology of the fillers on the dielectric properties, leakage current density and energy densities of the composites have been also discussed systematically. On comparing the five different poly(vinylidene fluoride) (PVDF) composites, we discovered that the BZT-BCT NFs/PVDF composite displayed low loss, small leakage current and excellent storage performance. On this basis, BZT-BCT NFs/PVDF composites with different volume contents were also fabricated. It can be found that the 7 vol% BZT-BCT NFs/PVDF nanocomposite possessed an excellent dielectric constant ( ε ∼ 17.6 at 100 Hz). Nevertheless, the 3 vol% BZT-BCT NFs/PVDF nanocomposite demonstrated higher energy storage density ( U e ∼ 7.86 J cm −3 ) and greater efficiency ( η ∼ 58%) at 310 kV mm −1 . This study may provide a new direction to enhance the energy density of inorganic/PVDF composites.