Triboelectric nanogenerators (TENG) could harvest mechanical energy through the triboelectric effect and electrostatic induction. Polyurethane foam are common types of flexible foams that can induce electrons to the electrodes and generate Alternating Current (AC) electricity when exposed to vibration in the triboelectric device. However, surface modification by inserting semi-conducting nanoparticles such as TiO2, or conductive nanostructures such as graphite, graphene oxide (GO) and reduced graphene oxide (RGO) its one of the ways to improve the efficiency of TENGs. In the present study, the trasonication assissted and freestanding triboelectric-layer mode (FSTENGs) were used for farication of TENGs device. The output circuit voltage (Voc) and short circuit current (Isc) values of the TENGs device with freestanding method were recorded. The results shown that the use of anostructures, change the conductivity and porosity of flexible foams and subsequently produce higher current and voltage than common foams. Also, the use of GO and RGO had a greater effect than graphite and TiO2 nanoparticles on the performance of TENGs device, and increased the Voc to more than 10 V. Howrver, Polyurethane foam containing RGO, shows the best TENGs performance with Voc (16.7 V) and Isc (2 μA). By using the power management circuit, the generated AC power could be converted to Direct Current (DC). Considering the wide range of foams applications, the structures introduced in this research work could be potentially used in various types of self- power systems and sensors.

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