Unraveling Temperature-Dependent Contact Electrification between Sliding-Mode Triboelectric Pairs

Aurelia C. Wang, Binbin Zhang, Cheng Xu, Haiyang Zou, Zhiqun Lin, Zhong Lin Wang

Research output: Contribution to journalArticlepeer-review

54 Scopus citations

Abstract

The underlying mechanism on contact electrification (CE) has remained a topic of debate over centuries, and it is argued to be due to electron transfer, ion transfer, and/or even material species transfer. Recently, a previous study shows that CE is dominated by electrons, at least for solid–solid cases. Herein, by using a model detailing the charge transfer between triboelectric surfaces and thermionic emission of electrons via employing a sliding mode Ti–SiO2 triboelectric nanogenerator (TENG), surface charge decay behavior is scrutinized in lateral-sliding mode during operation at high temperature. The temperature dependence of TENG electric output contributes to characteristic metal–dielectric and dielectric–dielectric CEs, thereby providing further evidence that electrons are the dominating transferred charges in CE. The total surface charge output of the TENG is rationalized as a direct consequence of the coupling of the rate of electron thermionic emission, the charge transfer rate of CE, and the changing rate of the contacted area between the two materials. When the contacting area is larger than the displaced area, the CE between the two materials is the major contributor to measured surface charge. Conversely, the thermionic emission of the exposed surfaces dictates when the contacting area is smaller.

Original languageEnglish
Article number1909384
JournalAdvanced Functional Materials
Volume30
Issue number12
DOIs
StatePublished - 1 Mar 2020

Bibliographical note

Publisher Copyright:
© 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Keywords

  • contact electrification
  • nanogenerators
  • thermionic emission

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