Free-Standing PVDF/Reduced Graphene Oxide Film for All-Solid-State Flexible Supercapacitors towards Self-Powered Systems

Abstract

The development of polymer-based devices has attracted much attention due to their miniaturization, flexibility, lightweight and sustainable power sources with high efficiency in the field of wearable/portable electronics, and energy system. In this work, we proposed a polyvinylidene fluoride (PVDF)-based composite matrix for both energy harvesting and energy storage applications. The physicochemical characterizations, such as X-ray diffraction, laser Raman, and field-emission scanning electron microscopy (FE-SEM) analyses, were performed for the electrospun PVDF/sodium niobate and PVDF/reduced graphene oxide composite film. The electrospun PVDF/sodium niobate nanofibrous mat has been utilized for the energy harvester which shows an open circuit voltage of 40 V (peak to peak) at an applied compressive force of 40 N. The PVDF/reduced graphene oxide composite film acts as the electrode for the symmetric supercapacitor (SSC) device fabrication and investigated for their supercapacitive properties. Finally, the self-charging system has been assembled using PVDF/sodium niobate (energy harvester), and PVDF/reduced graphene oxide SSC (energy storage) and the self-charging capability is investigated. The proposed self-charging system can create a pathway for the all-polymer based composite high-performance self-charging system.

Modulation in polymer properties in PVDF/BCZT composites with ceramic content and their energy density capabilities

“…The PVDF-based material forms are always attractive for nanogenerators-based self-charging energy storage devices owing to their piezoelectric and energy storage properties. [4][5][6] The flexibility in composites due to the molecular chain structure of the polymer matrix is more stable than rigid electric crystalline ceramic particles during the fast movements and charge-discharge processes. Therefore, flexible composites possess better cycling stability.…”

“…Moreover, PVDF with its ability to bend and stretch, chemical stability, nontoxicity, and biocompatibility can be integrated into a variety of flexible electronics for nanogenerators-based self-charging energy storage devices. [4][5][6] Hence, PVDF-based material forms are always attractive for applications in flexible energy storage devices. [7][8][9][10][11] The PVDF is a semi-crystalline polymer which can be stabilized in its different polymorphs α, β, γ, δ, and ε.…”

Hybrid Internal Combustion Engine Based Auxiliary Power Unit

“…This may cause two issues. First, low SC impedance [12,13] may cause alternator overcurrent and subsequent protection circuitry tripping. Alternatively, alternator-provided current may exceed rated continuous SC current and damage the device.…”

Editorial for the Special Issue on the ICAE 2019

“…In this Special Issue, 10 technical papers are published on piezoelectric devices [ 1 , 2 , 3 , 4 ], biomedical devices [ 5 , 6 ], micromachining [ 7 , 8 ], and complementary metal-oxide-semiconductor (CMOS) logic devices [ 9 , 10 ]. For the piezoelectric devices, high-density piezoelectric micromachined ultrasonic transducer array based on patterned aluminum nitride thin film is introduced for imaging application [ 1 ].…”

“…For the piezoelectric devices, high-density piezoelectric micromachined ultrasonic transducer array based on patterned aluminum nitride thin film is introduced for imaging application [ 1 ]. A polyvinylidene fluoride-based composite matrix is presented for a complete polymer-based composite high-performance self-charging system [ 2 ]. Ring-type lead zirconate titanate ceramics prepared by the powder molding method are characterized for a high-intensity focused ultrasonic dispersion system [ 3 ].…”