Fig. 3: Output performance of the W-TENG with original height ranging from 20 to 65 mm under the horizontal axial pressing mode with eight power generation units electrically connected in parallel.

a Sinusoidal excitation experimental setup with the W-TENG device sandwiched between two parallel plates; b, c output voltages for different original heights of the W-TENG; d close-up view of the output voltage waveform when the original height is set to 35mm; e output voltage and current with varying load resistance at the original height of 35mm; f output power with varying load resistance at the original height of 35mm