Fig. 5: High charge density performance of RRF-FEP films.

a Stability test of the RRF-FEP3 CS-TENG with 2200 s. b Output current, voltage, and peak power density under various external loads of commercial FEP CS-TENG. c Output current, voltage, and peak power density under various external loads of RRF-FEP3 CS-TENG. d Comparison diagram of commercial FEP and RRF-FEP3 charging 2.2 μF capacitor at the same time. e, f Charging curve of 1, 2.2, 4.7 and 10 μF capacitor using the RRF-FEP3 CS-TENG. g Schematic diagram of working principle of DC-TENG. h Charge density and (i) Current of DC-TENG with RRF-FEP3. Source data are provided as a Source Data file.