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On the origin of enhanced power output in ferroelectric polymer-based triboelectric nanogenerators: Role of dipole charge versus piezoelectric charge

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Title
On the origin of enhanced power output in ferroelectric polymer-based triboelectric nanogenerators: Role of dipole charge versus piezoelectric charge
Author(s)
Jeong, Dong Geun; Ko, Young Joon; Kim, Jong Hun; Kong, Dae Sol; Hu, Ying Chieh; Lee, Dong Woo; Im, Seong Hyun; Lee, Jeongwan; Kim, Mi Suk; Lee, Gwan-Hyoung; Ahn, Chang Won; Ahn, Joung Real; Lee, Minbaek; Jeong Young Park; Jung, Jong Hoon
Publication Date
2022-12
Journal
Nano Energy, v.103
Publisher
Elsevier Ltd
Abstract
© 2022 Elsevier LtdWhile ferroelectric polymer-based triboelectric nanogenerators (FE-TENGs) have been regarded as one of the most efficient mechanical energy harvesting devices, their fundamental mechanism is still debated. Here, we propose a dipole charge-shifted work function as the main origin of enhanced performance rather than a piezoelectric charge-increased electrostatic induction. P(VDF-TrFE) FE polymers were contacted with and separated from an ITO metal electrode and another P(VDF-TrFE) FE polymer under the variation of poling voltage, pressure, and temperature. The power outputs of the ITO-P(VDF-TrFE) and P(VDF-TrFE)-P(VDF-TrFE) FE-TENGs increased with poling voltage and pressure, but decreased with temperature; these behaviors are consistent with that of dipole charge rather than piezoelectric charge. Surface-sensitive spectroscopy and microscopy investigations suggested that electrons should be transferred, depending on the dipole direction, in the ITO-P(VDF-TrFE), whereas electrons and material should be transferred, depending on Young's modulus, in the P(VDF-TrFE)-P(VDF-TrFE). The dipole- and piezoelectric charge-induced electric field plays a crucial role in the overlapped electron cloud model for the triboelectrification of FE-TENGs.
URI
https://pr.ibs.re.kr/handle/8788114/12530
DOI
10.1016/j.nanoen.2022.107806
ISSN
2211-2855
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > 1. Journal Papers (저널논문)
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