Abstract
AbstractA composite dielectric film with synergistically improved dielectric constant (ɛ′) and breakdown strength (Eb) was prepared by introducing wide‐bandgap aluminum oxide decorated reduced graphene oxide (rGO@Al2O3) into poly(vinylidene fluoride‐co‐chlorotrifluoroethylene) (P(VDF‐CTFE)). Consequently, a superior energy storage density (Ue = 3.6 J cm−3) of rGO@Al2O3/P(VDF‐CTFE) was obtained with only 0.1 wt% loading of rGO@Al2O3, being 133%, 947% higher than those of neat P(VDF‐CTFE) and 0.1 wt% rGO/P(VDF‐CTFE), respectively. These enhancements can be ascribed to the presence of core‐shell like rGO@Al2O3, where rGO effectively promotes surface polarization of composites, while Al2O3 as a barrier provides deep traps and prevents the physical contact of rGO nanosheets, thus inhibiting local field concentration and limiting charge carrier transition.Highlights Wide‐bandgap Al2O3 decorated rGO was introduced into P(VDF‐CTFE). The presence of Al2O3 hinders charge carrier leakage of the composites. rGO@Al2O3 increases the permittivity by forming plenty of micro‐capacitors. An improved energy storage density and efficiency are simultaneously achieved.
Published Version
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