Performance of dopamine modified 0.5(Ba0.7Ca0.3)TiO3-0.5Ba(Zr0.2Ti0.8) O-3 filler in PVDF nanocomposite as flexible energy storage and harvester

摘要

We demonstrate the potential of dopamine modified 0.5(Ba0.7Ca0.3)TiO3-0.5Ba(Zr0.2Ti0.8)O-3 filler incorporated poly-vinylidene fluoride (PVDF) composite prepared by solution cast method as flexible energy storage and harvesting devices. Filler surface functionalization with dopamine acts as a bridging factor between the filler and the polymer matrix, resulting in better filler dispersion. The improved dielectric loss tangent (< 0.02) and dielectric permittivity ranges from 9 to 34 are found beneficial for both energy harvesting and storage. Additionally, a significantly low DC conductivity (<10(-9) ohm(-1)cm(-1)) for all composites was achieved leading to an improved breakdown strength and charge accumulation capability. Maximum breakdown strength of 134 kV/mm and corresponding energy storage density 0.72 J/cm(3) were obtained from the filler content 10 wt%. The improved energy harvesting performance was characterized by obtaining a output voltage (V-out) = 1.84 V along with maximum power density of 11.4 mu W/cm(3) for the filler content of 10 wt% of the poled sample. Thus, the results show 0.5(Ba0.7Ca0.3)TiO3-0.5Ba(Zr0.2Ti0.8)O-3/PVDF composite has the potential for energy storage and harvesting applications that can significantly suppress the excess energy loss arises while utilizing different material. (C) 2021 Elsevier B.V. All rights reserved.