What is it about?
A flexible sponge-like nanogenerator (FSNG) based on ZnO nanoparticles (NPs) etched porous electret poly (vinylidene fluoride–hexafluoropropylene) (P(VDF-HFP)) film is spotlighted without any electrical poling treatment. It possesses improved dielectric and ferroelectric properties than neat P(VDF-HFP) film. The FSNG harvests an open-circuit voltage (Voc) of 9 V and short circuit current (Isc) of 1.3 μAcm−2 under repeated mechanical impact of 0.36 MPa stress amplitude on the top surface. With the power density (P) of 1.21 mW/cm2 and energy conversion efficiency of 0.3% it directly operates several consumer electronics. The highly sensitive (∼1 μVPa−1) FSNG is demonstrated as a self-powered wireless sensor with 3.0% efficiency for detecting some tiny human activities including finger movements.
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Why is it important?
ZnO nanoparticles etched porous electret P(VDF-HFP) film is spot lighted. • Superior dielectric and ferroelectric properties without any poling are observed. • It harvests 9 V output voltage with 4.7 μA current under 0.36 MPa stress. • It shows superior power density and energy conversion efficiency of same stress. • It also acts as self-powered wireless sensor for detecting tiny human activities.
Perspectives
Everyday, enormous amount of energies are wasted during walking, running, talking and so on. The way to capture and then use the energies in a scalable manner is very important as an alternate source of energy of fossil fuel. This work represents a simple approach to achive a high performance piezoelectric material to fabricate a nanogenerator which can be operated by single finger touch and other human motion to operate daily consumer electronics. Also, there is video proof of the demonstration. Though it was not uploaded but if anyone is interested then we can supply the video file of demonstration.
Dr. Biswajit Mahanty
Jadavpur University
Read the Original
This page is a summary of: An effective flexible wireless energy harvester/sensor based on porous electret piezoelectric polymer, Materials Chemistry and Physics, January 2017, Elsevier,
DOI: 10.1016/j.matchemphys.2016.11.003.
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