Textile-based TENGs mounted on the insoles. (a) Schematic illustration of the fabrication of TENG-cloth. (b) The short current when the TENG-cloth was worn under the foot. Reproduced with permission from [160
]. Copyright Wiley-VCH, 2015. (c) Schematic of the structure and working mechanism of the textile-based TENGs. (d) Output voltage of the textile-based TENG tested for 1200 s and over 7,200 cycles at the frequency of 6 Hz. (e) Output voltage generated by the textile-based TENG mounted on the insole. The two insets exhibit the shoe to extract biomechanical energy from human footfall. Reproduced with permission from [158
]. Copyright Springer Nature, 2019.