fig3

Figure 3. Output performance of small-size TENGs. (A) Output current of TENGs in contact-separation mode with different BT content. (B) Output voltage of TENGs in contact-separation mode with different BT content. (C) Output current of sponge composites with different rGO-Fe content. (D) Capacitance-derived effective relative permittivities of porous Ecoflex, BT/Ecoflex, and BT/Ecoflex/rGO-Fe composite sponges measured under identical conditions. (E) Comparison of the area-normalized output voltage and output current of the present TENG with those of previously reported TENGs. (F) Stability test of BT/Ecoflex/rGO-Fe composite films.