Crystals, Vol. 15, Pages 660: Electrical Characterization of a Novel Piezoelectric-Enhanced Supercapacitor with a PET/ITO/PVDF-Tr-FE/PEDOT:PSS:Graphene/LiTaO3/Al Structure

Crystals doi: 10.3390/cryst15070660

Authors:
Mariya Aleksandrova
Ivaylo Pandiev

This paper presents the electrical characterization of a flexible supercapacitor with a unique architecture incorporating a piezoelectric PVDF-TrFE film sandwiched between PEDOT:PSS:Graphene and LiTaO3 as a charge-generating and charge-transferring layer. Impedance spectroscopy measurements reveal frequency-dependent capacitance behavior, reflecting the contributions of both piezoelectric and supercapacitor capacitances. Charge–discharge cycling tests demonstrate the device’s energy storage capabilities and indicate a potential enhancement through the piezoelectric effect. Supercapacitor cycling tests demonstrate the device’s energy storage capabilities, with an estimated specific capacitance of 10.14 F/g, a power density of 16.3 W/g, an energy density of 5.63 Wh/kg, and a Coulombic efficiency of 96.1% from an active area of 1 cm2. The proposed structure can serve as an independent harvester and storage for low-power, wearable sensors.

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Mariya Aleksandrova www.mdpi.com