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No sweat: NTU researchers develop battery powered by perspiration, Tech News News & Top Stories

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SINGAPORE – Researchers at the Nanyang Technological University (NTU) have developed a battery that could use sweat to power wearables such as smart watches and fitness trackers.

The team of three scientists showed that a prototype of the battery was able to power a temperature sensor and send data to a smartphone through Bluetooth.

Four of the batteries, which generated a voltage of 4.2V, were worn around the wrist of a person using a stationary bicycle for 30 minutes.

Each battery was made by printing ink containing silver flakes onto a stretchable, sweat absorbent fabric, and measures 2cm by 2cm, about the size of a small postage stamp but thicker.

Separate tests in the laboratory showed that about 2ml of artificial sweat – or about half a teaspoon of liquid – could power a battery for about 20 hours.

When sweat comes into contact with the battery, the chloride ions and acidity of sweat cause the silver flakes to clump together.

This chemical…

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