Wearable Electronics May Soon Be Powered by Sweat

The biofuel cell array is made from a water-repellent paper substrate, and is worn on the arm or forearm like a bandage.  The paper layers collect sweat, and transport it to the cells via the capillary effect. The cells contain enzymes in the electrodes that produce an electric current when they react with lactate. In experiments, the biofuel cells generated a voltage of 3.66 V and an output power of 4.3 mW, which is “significantly higher” than previous lactate biofuel cells.