Contact Electrification at Dielectric Polymer Interfaces: On Bond Scission, Material Transfer, and Electron Transfer
Advanced Materials Interfaces 2023
Osvalds Verners, Linards Lapčinskis, Peter C. Sherrell, Andris Šutka

Triboelectric nanogenerators (TENGs) are revolutionizing mechanical-to-electrical energy harvesting. TENGs harvest energy through the polymer–polymer contact electrification (PCE) mechanism, driven by nanoscale processes at the contact interface. Currently, when discussing PCE there are two distinct schools of thought on which nanoscale interactions drive charging at the contact interface; 1) electron transfer, where orbital overlap leads to charge tunneling between polymers; or 2) mass (material) transfer, where polymer chain entanglement and intermolecular bonding leads to heterolytic bond scission. Here, a combination of in silico and benchtop experiments is used to elucidate the relative role of electron and mass transfer in PCE. In silico experiments show that covalent bond scission in a polymethylmethacrylate/polytetrafluoroethylene system occurs at 348 kcal mol−1, prior to electron cloud overlap, where the highest occupied molecular orbital and lowest unoccupied molecular orbital of the system remain separated by 163 kcal mol−1. Benchtop experiments show PCE-generated charges cannot be simply discharged via electrical grounding, indicating the formation of bound surface charge from mass transfer. The calculations and contact-electrification tests provide strong evidence to support mass transfer being the leading mechanism driving PCE.


Atslēgas vārdi
contact electrification | material transfer | molecular dynamics | polymers | TENGs | triboelectricity
DOI
10.1002/admi.202300562
Hipersaite
https://onlinelibrary.wiley.com/doi/10.1002/admi.202300562

Verners, O., Lapčinskis, L., Sherrell, P., Šutka, A. Contact Electrification at Dielectric Polymer Interfaces: On Bond Scission, Material Transfer, and Electron Transfer. Advanced Materials Interfaces, 2023, Vol. 10, No. 36, Article number 2300562. e-ISSN 2196-7350. Pieejams: doi:10.1002/admi.202300562

Publikācijas valoda
English (en)
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