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Chemical functional groups on solid surfaces greatly influence contact electrification (CE) at water–solid interfaces. Previous studies of their effects mainly swapped materials or bonded related molecules to a substrate, introducing other factors of influence. This work aims at unambiguously demonstrating the role of functional groups in water-polymer CE. We study the contribution of functional groups, by using ion coupled plasma etching to modify a high-density polyethylene (HDPE) film, a polymer with a naturally quasi-null charge transfer ability. Fluoride (HDPE–F) and hydroxyl (HDPE–OH) functional groups are generated and endowed HDPE with charge withdrawing ability. HDPE–F withdraws 2.5–2.7 times more charges than HDPE–OH. Concurrently, the surface charges accumulated generate electrostatic forces, altering the droplets motion. This phenomenon provides another approach to study CE, helping to evaluate the contribution of electrons to solid–liquid CE. Finally, employing HDPE–F to perform contact-electro-catalysis shows its activity is 2.4 times higher than that of commercial fluorinated films.


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Water–solid contact electrification and catalysis adjusted by surface functional groups

Show Author's information Yusen Su1,2Andy Berbille1,2Zhong Lin Wang1,2,3Wei Tang1,2( )
CAS Center for Excellence in Nanoscience, Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, 100083, China
School of Nanoscience and Technology, University of Chinese Academy of Sciences, Beijing, 100049, China
Georgia Institute of Technology, Atlanta, GA 30332-0245, USA

Abstract

Chemical functional groups on solid surfaces greatly influence contact electrification (CE) at water–solid interfaces. Previous studies of their effects mainly swapped materials or bonded related molecules to a substrate, introducing other factors of influence. This work aims at unambiguously demonstrating the role of functional groups in water-polymer CE. We study the contribution of functional groups, by using ion coupled plasma etching to modify a high-density polyethylene (HDPE) film, a polymer with a naturally quasi-null charge transfer ability. Fluoride (HDPE–F) and hydroxyl (HDPE–OH) functional groups are generated and endowed HDPE with charge withdrawing ability. HDPE–F withdraws 2.5–2.7 times more charges than HDPE–OH. Concurrently, the surface charges accumulated generate electrostatic forces, altering the droplets motion. This phenomenon provides another approach to study CE, helping to evaluate the contribution of electrons to solid–liquid CE. Finally, employing HDPE–F to perform contact-electro-catalysis shows its activity is 2.4 times higher than that of commercial fluorinated films.

Keywords: charge transfer, contact electrification, contact-electro-catalysis, solid–liquid interfaces

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Publication history
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Acknowledgements

Publication history

Received: 09 July 2023
Revised: 11 August 2023
Accepted: 21 August 2023
Published: 13 September 2023
Issue date: April 2024

Copyright

© Tsinghua University Press 2023

Acknowledgements

Acknowledgements

This research was supported by the National Key R & D Project from Minister of Science and Technology (No. 2021YFA1201601) and National Natural Science Foundation of China (No. 52192610), Youth Innovation Promotion Association (W.T.), and CAS-TWAS President’s Fellowship (A.B.).

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