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a–h) Spherical TENGs based on spring‐assisted multilayered structure for efficient water wave energy harvesting. Reproduced with permission.[ 47 ] Copyright 2018, Wiley‐VCH. i–o) Whirling‐folded TENGs with high average power for water wave energy harvesting. Reproduced with permission.[ 48 ] Copyright 2019, Wiley‐VCH.
