While 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.
|Publication status||Published - 2022 Dec 1|
Bibliographical noteFunding Information:
This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF), funded by the Ministry of Education, Science and Technology ( 2020R1A4A1017915 , 2021M2E8A1048961 ). Y.J.K. would like to acknowledge the support from Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education ( 2020R1A6A3A13074042 ). C.W.A. acknowledge the support from the Priority Research Centers Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (Grant No. NRF-2019R1A6A1A11053838 ). J.H.K and G-H.L acknowledge the support from Basic Science Research Program through the NRF funded by the Ministry of Science, ICT & Future Planning ( 2018M3D1A1058793 ). J.Y.P acknowledge the support from the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) ( 2022R1A2C3004242 ).
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All Science Journal Classification (ASJC) codes
- Renewable Energy, Sustainability and the Environment
- Materials Science(all)
- Electrical and Electronic Engineering