High-performance coaxial piezoelectric energy generator (C-PEG) yarn of Cu/PVDFTrFE/ PDMS/Nylon/Ag

Jung Hyuk Kim, Bosung Kim, Sang Woo Kim, Hyun Wook Kang, Min Chul Park, Dong Hee Park, Byeong Kwon Ju, Won Kook Choi

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Article number145401
Issue number14
Publication statusPublished - 2021 Apr 2

Bibliographical note

Funding Information:
The author, W K Choi, would like to appreciate the financial support from the KIST institutional program (2V04270, 2V04580, 2V05320 and 2E30420).

Publisher Copyright:
© 2021 IOP Publishing Ltd.

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering


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