High-performance coaxial piezoelectric energy generator (C-PEG) yarn of Cu/PVDF-TrFE/PDMS/Nylon/Ag
- High-performance coaxial piezoelectric energy generator (C-PEG) yarn of Cu/PVDF-TrFE/PDMS/Nylon/Ag
- 최원국; 박민철; 박동희; 김정혁; 주병권; 김보성; 김상우; 강현욱
- coaxial piezoelectric energy generator; PVDF-TrFE nanofibers; in-plane array; C-PEG yarn; characteristic output V-P curve
- Issue Date
- VOL 32-145401-11
- Coaxial type piezoelectric energy generator (C-PEG) nanofiber was fabricated by a self-designed continuous electrospinning deposition system. Piezoelectric PVDF-TrFE nanofiber as an electroactive material was electrospun at a discharge voltage of 9？12 kV onto a simultaneously rotating and transverse moving Cu metal wire at an angular velocity of ωg = 60？120 RPM. The piezoelectric coefficient d33 of the PVDF-TrFE nanofiber was approximately ？20 pm V？1 . The
generated output voltage (VG) increased according to the relationship exp(-αP) (α = 0.41？ 0.57) as the pressure (P) increased from 30 to 500 kpa. The VG values for ten and twenty pieces of C-PEG were VG = 3.9 V and 9.5 V at P = 100 kpa, respectively, relatively high output voltages compared to previously reported values. The high VG for the C-PEG stems from the fact that it can generate a fairly high VG due to the increased number of voltage collection points compared
to a conventional two-dimensional (2-dim) capacitor type of piezoelectric film or fiber device. C-PEG yarn was also fabricated via the dip-coating of a PDMS polymer solution, followed by winding with Ag-coated nylon fiber as an outer electrode. The current and power density of ten pieces of C-PEG yarn were correspondingly 22 nA cm？2 and 8.6 μW cm？3 at VG = 1.97 V, higher than previously reported values of 5.54 and 6 μW cm？3 . The C-PEG yarn, which can generate high voltage compared to the conventional film/nanofiber mat type, is expected to be very useful as a wearable energy generator system.
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