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Probing Contact Electrification: A Cohesively Sticky Problem.

Peter C Sherrell1, Andris Sutka2, Nick A Shepelin1,3

  • 1Department of Chemical Engineering, The University of Melbourne, 3010 Parkville, Victoria, Australia.

ACS Applied Materials & Interfaces
|September 9, 2021
PubMed
Summary
This summary is machine-generated.

Material transfer, not just electron transfer, is key to understanding polymer contact electrification and triboelectric energy harvesting. This finding challenges the traditional triboelectric series and offers a new model for energy conversion.

Keywords:
cohesive energycontact electrificationenergy harvestinginterfacespolymertriboelectric

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Area of Science:

  • Materials Science
  • Energy Conversion
  • Triboelectricity

Background:

  • Contact electrification and the triboelectric effect are crucial for mechanical-to-electrical energy conversion, especially in polymers.
  • The precise mechanism of charge generation in polymers remains ambiguous, with proposed sources including electron transfer, material transfer, and chemical species transfer.

Purpose of the Study:

  • To challenge the prevailing focus on electron transfer in triboelectric energy harvesting.
  • To investigate the mechanisms of charge generation in polymer-polymer, polymer-glass, and polymer-liquid metal interfaces.
  • To propose a generalized model for polymer contact electrification.

Main Methods:

  • Conducted rigorous experiments measuring charge density across 196 polymer-polymer, 14 polymer-glass, and 14 polymer-liquid metal systems.
  • Investigated various interfaces to identify the primary sources of charge generation.
  • Analyzed experimental data to develop a generalized model for polymer contact electrification.

Main Results:

  • Provided clear experimental evidence for material transfer via heterolytic bond cleavage at polymer interfaces.
  • Demonstrated that material transfer is a significant contributor to charge generation in polymer contact electrification.
  • Identified cohesive energy density as a critical parameter for polymer contact electrification.

Conclusions:

  • Material transfer must be considered alongside electron transfer when explaining charge generation in polymeric mechanical energy harvesters.
  • The study provides a correlated physical property (cohesive energy density) to better understand and predict the triboelectric series.
  • This research offers a more comprehensive model for polymer contact electrification and energy harvesting applications.