fig5

Figure 5. (A) Charging profiles of capacitors with different capacitances, along with the operational circuitry of the TENG-based self-charging energy system; (B) output voltage and power density of the MG/leather-based TENG as a function of external load resistance; (C) charging curves of a 10 μF capacitor powered by the TENG at different frequencies; (D) stability test of the MG/leather-based TENG under a contact force of 10 N at 2 Hz; (E) optical photograph of 60 LEDs illuminated by the MG/leather-based TENG.