High-performance triboelectric nanogenerators based on blade-coating lead halide perovskite film and electrospinning PVDF/graphene nanofiber

Increasing the triboelectric charge density, and increasing the contact area are both important for improving the triboelectric output performance of triboelectric nanogenerators (TENGs). In this work, the triboelectric output performances of TENGs were significantly improved by changing the preparation method of positive friction layer material Cs0.05FA0.7MA0.25PbI3 perovskite film and negative friction layer material PVDF-graphene (PG) composite material. The TENG based on perovskite film prepared by blade-coating (P-B) and PG nanofiber prepared by electrospinning (PG-E) achieved champion triboelectric output performances, including an open-circuit voltage of 200 V, a short-circuit current of 16.3 μA, a maximum transfer charge of 88.2 nC and a power density of 11.32 W/m2 under 3 Hz and 50 N, mainly because of the smaller work function of the P-B film and the larger effective contact area of the PG-E nanofiber. Besides, the TENG shows good durability and stability under different humidity and temperature conditions, and it can quickly charge capacitors and light up 351 commercial LEDs. This work demonstrates that the P-B and PG-E based TENG can be applied to energy harvesting, low power electronic devices driving, and self-powered temperature and humidity sensors.