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a–g) A super‐robust and frequency‐multiplied pendulum‐inspired TENG for efficient harvesting of water and wind energy. Reproduced with permission.[ 37 ] Copyright 2019, Elsevier. h–j) Three kinds of 3D‐printed TENGs with different structures for harvesting various mechanical energy. Reproduced with permission.[ 38 ] Copyright 2019, Elsevier.
