fig5

Figure 5. Actual Practical Applications. (A) Schematic diagram of the capacitor charging circuit, (B) voltage plots for charging different capacitors with KF DC-TENG when E = 1, (C) voltage plots for charging a 47 μF capacitor with KF DC-TENG at different E values, (D) circuit diagram of DC-TENG directly powering a resistor, (E) manually lighting up 744 LEDs with KF DC-TENG when E = 1, (F) lighting up 744 LEDs with KF DC-TENG by friction with PTFE fabric when E = 1, (G) lighting up 1392 LEDs with a four unit KF DC-TENG, (H) circuit diagram of DC-TENG powering electronic devices through a PMC, powering (I) a wristwatch, (J) a calculator, (K) a hygrometer, and (L) a 1.5 W commercial light bulb through the PMC. Photos in (E-G), (I-L) are taken by the authors. TENG: Triboelectric nanogenerator; KF DC-TENG: knitted fabric-based direct current TENG; PMC: power management circuit; LEDs: light emitting diodes.