FIGURE 2.

Electrical energy generation by respiration‐driven TENGs. A, Schematic diagram of an aeroelastic vibration TENG. Inset is the digital image of the device. B, Different vibration modes and frequency of the triboelectric beam. C, Output voltage of the TENG under an airflow speed of 15 m/s. D, Voltage and power output as a function of load resistance. Reproduced with permission: Copyright 2015, the American Chemical Society. ⁶⁴ E, Schematics of a cantilever TENG. Inset is the digital image of the device. F, Voltage output of the TENG under different airflow speed. Reproduced with permission: Copyright 2018, the American Chemical Society. ⁶⁵ G, Voltage output of a CS‐mode TENG when placed on waist. Insets are the schematic and digital image of the TENG device. H, Voltage and power output as a function of load resistance. Reproduced with permission: Copyright 2019, Elsevier. ⁶⁸ TENG, triboelectric nanogenerator