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Schematic of triangulated cylinder (TC) origami-based piezoelectric/triboelectric hybrid generator (TCO-HG). (a) TCO-HG composed of rotational triboelectric nanogenerator (TENG) and piezoelectric nanogenerator (PENG)/TENG hybrid generator. (b) Single-stage hybrid generator composed of TENG and PENG on the outer and inner surfaces, respectively. (c) Rotation of top substrate during application of external pressure.
