Highly stretchable and transparent triboelectric nanogenerator based on multilayer structured stable electrode for self-powered wearable sensor

In recent years, triboelectric nanogenerators (TENGs) have grasped considerable attentions as sustainable power sources for next-generation electronics. However, far too rare research has been carried out to simultaneously achieve stretchability and transparency in TENGs. Here, we developed a stretchable and transparent TENG based on a Mxene-AgNWs-Mxene-polyurethane nanofibers (MAMP) electrode which exhibits excellent optoelectronic properties with low sheet resistance of 10.1 Ω/sq at the transmittance of 87.6%. Meanwhile, the as-prepared electrode achieves outstanding stretchability and durability with maximum strain of 180%, as well as 42% resistance variation after 1000 stretch-release cycles at 65% strain, which is attributed to the synergistic effect of the reinforcement of nanofiber-based scaffold and the improvement of adhesion between conductive network and elastic matrix by Mxene. Furthermore, the stretchable and transparent MAMP-TENG is employed as energy harvester and motion sensor, producing output voltage of 38 V and current density of 1.67 mA/m 2 just by hand tapping . The integration of sustainable power source and motion sensor with the attributes of stretchable and transparent in one makes it promising for applications in wearable devices and human-machine systems.