fig4

Figure 4. Nanogenerators. (A) High-performance microcone-array flexible piezoelectric acoustic sensor based on multicomponent lead-free perovskite rods^[83]; (B) Hybrid piezoelectric/triboelectric wearable nanogenerator based on stretchable PVDF-PDMS composite films^[86]; (C) C-TENG maintains high output in humid or wet conditions^[89]. Reproduced with permission from Elsevier (A), American Chemical Society (B), and Wiley (C).