Triboelectric nanogenerators (TENGs), a newly developed energy harvesting device that converts surrounding environmental mechanical stimuli into electricity, have been significantly explored as an ideal long-term power source for electrical devices. Despite recent advances, the development of advanced TENG devices with sufficient outputs to sustainably power electronic devices and rapid self-healability under mild conditions to improve their lifetime and function is highly demanded. Here, we report a robust self-healable and reprocessable TENG fabricated with a covalent adaptive network based on mechanically strong fluorinated poly(hindered urea) (F-PHU) integrated with ionic liquid as an efficient dielectric material to improve its triboelectric efficiency and self-healing capability simultaneously. The synthesis and integration of a well-defined reactive copolymer having both pendant fluorinated and t-butylamino bulky groups are the key to fabricate robust F-PHU networks containing fluorinated dangling chains that can interact with ionic liquids to induce ionic polarization, which raises the dielectric constant and thus increases triboelectric performance. They also are cross-linked with dynamic bulky urea linkages for rapid self-healability and high reprocessability through their reversible exchange reactions at moderate temperatures. The developed ionic F-PHU materials exhibit a high TENG output performance (power density of 173.0 mW/m2) as well as high TENG output recovery upon repairing their surface damages. This work demonstrates that such a synergistic design of triboelectric ionic F-PHU materials could have great potential for applications requiring high-performance and long-lasting energy harvesting.
Bibliographical noteFunding Information:
This work is supported by the Natural Science and Engineering Research Council (NSERC) in Canada through Discovery Grant (RGPIN-2021-03473) and Canada Research Chair (CRC) (950-231058) Award; National Research Foundation (NRF) of Korea (2019R1I1A1A01060653); Ministry of Trade, Industry and Energy (20010566); and Korea Research Institute of Chemical Technology (KRICT) Research and Development (R&D, SS2141-10) program. The Office of the VP Research at Concordia University is also acknowledged for the Horizon Postdoctoral Fellowship of P.N. Authors thank Twinkal Patel for her helpful discussions as well as Prof. Suong Van Hoa for his kind permission for our access to a tensile tester and Dr. Heng Wang for his tensile measurements at Concordia Center of Composite (ConCom).
© 2022 American Chemical Society.
- dynamic/reversible chemistries
- fluorinated polymer network
- ionic liquids
- poly(hindered urea)
- triboelectric nanogenerator
ASJC Scopus subject areas
- Materials Science(all)