Correlation between frictional heat and triboelectric charge: In operando temperature measurement during metal-polymer physical contact. (1st December 2022)

• Record Type: Journal Article
• Authors: Lee, Dong Woo; Kong, Dae Sol; Kim, Jong Hun; Park, Sang Hyeok; Hu, Ying Chieh; Ko, Young Joon; Jeong, Chan Bae; Lee, Seoku; Il Jake Choi, Joong; Lee, Gwan-Hyoung; Lee, Minbaek; Wie, Jeong Jae; Chang, Ki Soo; Park, Jeong Young; Jung, Jong Hoon
• Is Part Of: Nano energy. Volume 103(2022)Part A
• Publication Date: 2022-12-01
• Subjects: In operando measurement -- Frictional heat -- Triboelectric charge -- Temperature variation -- Activation energy -- Young's modulus; 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.2022.107813
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: In operando techniques have emerged to elucidate the fundamental mechanism of triboelectrification via relevant physical quantity measurement during the physical contact of two materials. Here, a correlation between frictional heat and triboelectric charge is reported in a metal-polymer triboelectric nanogenerator through the in operando temperature measurement. Fluorine-doped tin oxide (FTO) metal is slid back-and-forth under different contact pressures across polydimethylsiloxane (PDMS) polymers having different degrees of crosslinking, i.e., mixing ratio. Both the triboelectric charge and temperature variation increase and become saturated with different time-constants. Notably, the saturated triboelectric charge increases, while the saturated temperature decreases, with increasing mixing ratio. In contrast, both saturated triboelectric charge and temperature increase with increasing contact pressure. X-ray photoemission spectroscopy reveals that chemical bonds are modified inhomogeneously at the surface, and that charged materials are transferred from PDMS to FTO in accordance with the mixing ratio- and sliding time-dependent triboelectric charges. Frictional heat plays a distributive role in bond rupture and temperature variation, depending on the activation energy and frictional coefficient of PDMS. In operando temperature variation measurement provides important information on the specific bonds for triboelectrification and detailed charge-transfer process during physical contact. Graphical Abstract: ga1 Highlights: In operando investigation of correlation between frictional heat and triboelectric charge. Distributive role of frictional heat on bond rupture and temperature variation. Providing quantitative estimation of rupture energy for a bond breaking/creation model. Providing time-constant of charge and temperature for a thermionic emission model.