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Structures of triboelectric-piezoelectric hybrid generators: (a) A pressure sensor with a self-poled P(VDF-TrFE) sponge acting as the tribo-layer (Reproduced with permission [25]. Copyright 2017 Tsinghua University Press and Springer-Verlag GmbH Germany); (b) A vibration sensor with a double-arched structure (Reproduced with permission [57]. Copyright 2017 Elsevier).
