Nellepalli Pothanagandhi, Kim Minsoo P, Park Junyoung, Noh Seung Man, Ye Zhibin, Jung Hyun Wook, Ko Hyunhyub, Oh Jung Kwon
Department of Chemistry and Biochemistry, Concordia University, Montreal, Quebec H4B 1R6, Canada.
School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea.
ACS Appl Mater Interfaces. 2022 Apr 20;14(15):17806-17817. doi: 10.1021/acsami.2c01963. Epub 2022 Apr 6.
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 -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/m) 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.
摩擦纳米发电机（TENGs）是一种新开发的能量收集装置，可将周围环境的机械刺激转化为电能，作为电子设备理想的长期电源已得到广泛研究。尽管最近取得了进展，但仍迫切需要开发具有足够输出功率以可持续为电子设备供电、并在温和条件下具有快速自愈能力以提高其使用寿命和功能的先进TENG设备。在此，我们报道了一种坚固的可自愈且可再加工的TENG，它由基于机械强度高的氟化聚（受阻脲）（F-PHU）的共价自适应网络制成，并集成离子液体作为高效介电材料，以同时提高其摩擦电效率和自愈能力。具有氟化侧基和丁基氨基大体积基团的明确反应性共聚物的合成与整合是制备含有氟化悬垂链的坚固F-PHU网络的关键，这些悬垂链可与离子液体相互作用以诱导离子极化，从而提高介电常数，进而提高摩擦电性能。它们还通过动态大体积脲键交联，通过在中等温度下的可逆交换反应实现快速自愈性和高再加工性。所开发的离子型F-PHU材料表现出高TENG输出性能（功率密度为173.0 mW/m）以及在修复其表面损伤后TENG输出的高恢复率。这项工作表明，这种摩擦电离子型F-PHU材料的协同设计在需要高性能和持久能量收集的应用中具有巨大潜力。
