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We demonstrate the potential of dopamine modified0.5(Ba0.7Ca0.3)TiO3-0.5Ba(Zr0.2Ti0.8)O3 filler incorporated poly-vinylidenefluoride (PVDF) composite prepared by solution cast method as both flexibleenergy storage and harvesting devices. The introduction of dopamine in fillersurface functionalization acts as bridging elements between filler and polymermatrix and results in a better filler dispersion and an improved dielectricloss tangent (<0.02) along with dielectric permittivity ranges from 9 to 34which is favorable for both energy harvesting and storage. Additionally, asignificantly low DC conductivity (< 10-9 ohm-1cm-1) for all composites wasachieved leading to an improved breakdown strength and charge accumulationcapability. Maximum breakdown strength of 134 KV/mm and corresponding energystorage density 0.72 J/cm3 were obtained from the filler content 10 weight%.The improved energy harvesting performance was characterized by obtaining amaximum piezoelectric charge constant (d33) = 78 pC/N, and output voltage(Vout) = 0.84 V along with maximum power density of 3.46 microW/cm3 for thefiller content of 10 wt%. Thus, the results show0.5(Ba0.7Ca0.3)TiO3-0.5Ba(Zr0.2Ti0.8)O3/PVDF composite has the potential forenergy storage and harvesting applications simultaneously that cansignificantly suppress the excess energy loss arises while utilizing differentmaterial.

Performance of dopamine modified 0.5(Ba0.7Ca0.3)TiO3-0.5Ba(Zr0.2Ti0.8)O3 filler in PVDF nanocomposite as flexible energy storage and harvester