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(A) Schematic illustration of a flexible and wearable epidermal ethanol BFC that harvests bioenergy in real-time from the perspiration of individuals after drinking alcohol. (B) Optical photo of a flexible epidermal ethanol BFC (scale bar, 1 cm). (C) Schematic illustration of an epidermal ethanol BFC. (D) Schematic illustration of the microfluidic module for continuous real-time in situ fresh sweat sampling, transfer, storage, and excretion on human skin (Sun et al., 2021).
