Triboelectric nanogenerators (TENGs) that convert mechanical energy into electricity have been considered as an economical strategy for energy harvesting. Modification of the surface properties of triboelectric materials is a straightforward method to improve the performance of TENGs. In this study, for the first time, we demonstrate a promising strategy to improve the performance and stability of TENGs by using electrostatically self-assembled 1H,1H-perfluorooctylamine (F15-NH2) as the surface modification layer for the polydimethylsiloxane (PDMS) dielectric layer. Our results indicate that the protonated amine groups present on F15-NH2can anchor onto the PDMS surfaceviaelectrostatic interactions, whereas adoption of a slow-drying procedure during film formation enables highly electronegative perfluoroalkyl chains to accumulate at the air interface, facilitating the formation of an ordered molecular arrangement that can induce a favourable surface dipole for efficient electron transfer between the electrode and the dielectric layer. Importantly, this strategy can be applicable to a large-area plastic-based TENG, and a remarkable power density up to 57.1 W m−2is achieved. To the best of our knowledge, the power density reported herein represents the highest value ever reported for solution-based chemically modified TENGs. The impressive output characteristics of the TENG enable 338 light-emitting diodes to be lit up instantaneously. More encouragingly, excellent durability of the TENG is attained when using a perylene diimide derivative-modified Ag layer as the electrode, exhibiting an almost unchangedVocover 240 000 operation cycles. Our findings highlight the importance of surface engineeringviaelectrostatically self-assembled materials for realizing high-performance and stable TENGs with high reproducibility. The strategies demonstrated herein enable the mass production of surface modification layers through processes that are compatible with scalable roll-to-roll manufacturing techniques, which can accelerate the commercialization of low-cost printed TENG technology.
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Materials Science(all)