TENG-based hybrid generators for outdoor multitype mechanical/solar/thermal energy harvesting. (a) A triboelectric-photovoltaic hybrid cell for raindrop and solar energy harvesting. Reproduced with permission from Ref. [126], copyright 2020 American Chemical Society. (b) A triboelectric-photovoltaic unified module for simultaneous raindrop, solar, and wind energy harvesting. Reproduced with permission from Ref. [127], copyright 2020 Elsevier B.V. (c) A triboelectric-photovoltaic hybrid all-in-one power source for simultaneous raindrop, solar, and wind energy harvesting. Reproduced with permission from Ref. [128], copyright 2020 Wiley-VCH. (d) A fully packed spheroidal triboelectric-electromagnetic-photovoltaic hybrid generator for wave/solar energy harvesting and self-powered position tracking. Reproduced with permission from Ref. [129], copyright 2019 Elsevier B.V. (e) A nonencapsulated pendulum-like paper-based triboelectric-electromagnetic-photovoltaic hybrid generator for wave/solar energy harvesting. Reproduced with permission from Ref. [130], copyright 2019 Wiley-VCH. (f) A triboelectric-pyroelectric hybrid generator for recovering energy from low-grade waste fluids. Reproduced with permission from Ref. [132], copyright 2020 Elsevier B.V. (g) A triboelectric-thermoelectric hybrid nanogenerator for ambient mechanical energy and friction-induced heat energy harvesting. Reproduced with permission from Ref. [133], copyright 2018 Wiley-VCH.