On the origin of enhanced power output in ferroelectric polymer-based triboelectric nanogenerators: Role of dipole charge versus piezoelectric charge. (1st December 2022)

• Record Type: Journal Article
• Authors: 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; Park, Jeong Young; Jung, Jong Hoon
• Is Part Of: Nano energy. Volume 103(2022)Part A
• Publication Date: 2022-12-01
• Subjects: Ferroelectric polymer -- Triboelectric nanogenerator -- High power generation -- Dipole charge -- Piezoelectric charge -- Origin of triboelectrification; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2022.107806
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: 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. Graphical Abstract: ga1 Highlights: Triboelectric performance under various poling voltage, pressure, and temperature. Introduction of surface-sensitive techniques to clarify triboelectrification mechanism. Electrons-transfer for triboelectrification in metal-FE polymer. Electrons- and material-transfer for triboelectrification in FE polymer-FE polymer. Dipole/piezoelectric charge induced electric field in overlapped electron cloud model.