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Porous TENG mounted on the insoles. (a) Diagram of the synthesis process. (b) The process of generating electricity from a single cavity. (c) SEM magnified view of the inner surface, with exposed CNTs labeled. (d) Photograph of an as-prepared round PNC (5 cm in diameter and 0.5 cm thick). The SEM inset shows the surface morphology. (e) Cycled ISC and corresponding status of a foot under repeated normal walking. Reproduced with permission from [159]. Copyright Wiley-VCH, 2016.
