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Structure and working mechanism of the TENG. (A) Structural diagram of the TENG. (B–D) SEM images of the rubber fiber, the nylon fiber, and the PTFE fiber, respectively. Scalebar in (B–D) is 500 μm. (E–G) Photograph of the flexible and stretchable TENG in different shapes. (H) Working principle of the TENG. (I) Numerical calculation of the corresponding electrical potential distribution by COMSOL software. (J) Stress–strain curve of the four identical TENGs.
