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a–h) Tilting‐sensitive TENGs for energy harvesting from unstable/fluctuating surfaces. Reproduced with permission.[ 35 ] Copyright 2019, Wiley‐VCH. i–l) Buoy‐like liquid–solid interface contact‐electrification‐based TENGs for harvesting low‐frequency blue energy. Reproduced with permission.[ 36 ] Copyright 2018, Wiley‐VCH.
