Novel core–shell-structured ironbark-like TiO2 as fillers for excellent discharged energy density of nanocomposites

The perpendicular orientation of nanowires to electric fields would greatly improve the breakdown strengths (Eb) polymer-based nanocomposites; however, relatively small polarization at filler fraction, and thus unsatisfactory discharged energy density (Ud), restrict their further application. In this study, x vol.% TO@TO/PVDF nanocomposites with superior storage performances have been fabricated, where ironbark-like TiO2 fillers (TO@TO) core–shell structures lead enhanced Eb simultaneously. former is due coupling effects increased interfacial polarization, while latter path tortuosity tree growing TO@TO fraction. Strikingly, an excellent Ud 13.1 J/cm3 was achieved in 1.5 nanocomposite 383 MV/m, which by 220% compared that pure PVDF (5.98 J/cm3). primary results might provide a strategy design fabricate satisfactory as well flexible easy processing ability