TENG-based hybrid generators on the human body for wearable electronics. (a) A nonpiezoelectric meso-PLA electret-based TENG combined with a double-layered PLLA-based PENG for E-skin application. Reproduced with permission from Ref. [109], copyright 2020 Wiley-VCH. (b) A self-powered pulse sensor based on a self-arched structure with a combined effect of a PENG and a TENG. Reproduced with permission from Ref. [163], copyright 2020 Elsevier B.V. (c) A biomimetic and flexible self-powered sensor with hybridized TENG and PENG to enhance the energy harvesting characteristics. Reproduced with permission from Ref. [164], copyright 2020 Elsevier B.V. (d) A self-powered and self-functional cotton sock based on the piezoelectric and triboelectric hybrid mechanism. Reproduced with permission from Ref. [135], copyright 2019 American Chemical Society. (e) Polarization-controlled PVDF-based TENG-PENG hybrid generator for effectively harvesting the human footstep energy. Reproduced with permission from Ref. [165], copyright 2020 Elsevier B.V. (f) A miniaturized freestanding kinetic impact-based nonresonant TENG-EMG hybrid generator for harvesting the human-induced vibrations. Reproduced with permission from Ref. [134], copyright 2020 Elsevier B.V. (g) A self-cleaning flexible hybrid energy harvesting system integrated by an F-OSC and an autonomous single-electrode TENG. Reproduced with permission from Ref. [172], copyright 2019 Elsevier B.V. (h) A hierarchically patterned self-powered sensor for multifunctional tactile sensing. Reproduced with permission from Ref. [177], copyright 2020 American Association for the Advancement of Science.