Triboelectric nanogenerators based on fluorinated graphite

Abstract The emergence of triboelectric nanogenerators (TENGs) makes it possible to harvest and widely use micro-nano energy in the environment efficiently. Fluorinated graphite is a representative member of the carbon fluoride family with excellent properties. In this paper, graphite fluoride was prepared by plasma treatment technology, and a graphite fluoride-based TENG with a single electrode working mode was assembled. This fluorinated graphite sheet-based TENG (FGS-TENG) has a short-circuit current of 1.1 μ A, an open-circuit voltage of 26 V, and a transferred charge of 12.5 nC, which are 4.4 times, 2.6 times, and 2.8 times those of graphite sheet-based TENG (GS-TENG), respectively. It can be seen that the electrical performance of FGS-TENG has been significantly improved by fluorinating GS. In addition, the FGS-TENG has excellent acid and alkali resistance. The output of FGS-TENG remained almost unchanged even after the FGSs were immersed in solutions with pH values of 3, 5, 7, 9, and 11 for 2 h, showing excellent working stability and environmental adaptability. Based on this FGS-TENG, a walking motion sensor device was also designed for high-risk environments, which could detect the walking state in real time.