Wearable electronic devices could be powered by human sweat

‘Your sweat may one day keep your wearable devices running as scientists have recently developed stretchable fuel cells that extract energy from human sweat to power electronics such as Bluetooth radios and LEDs. The biofuel cells produce 10 times more power per surface compared with any existing wearable biofuel cells, the researchers wrote in Energy & Environmental Science.
As part of the study, a team of engineers at the University of California San Diego used lithography and screen-printing techniques to develop 3D carbon nanotube-based cathode and anode arrays. The arrays were then fitted with an enzyme that oxidizes the lactic acid in human sweat in order to generate current. This effect that turns sweat into a power source.’
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