[Slashdot] - New Device Generates Electricity From Thin Air

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An anonymous reader quotes a report from Smithsonian: With a new technique, scientists have essentially figured out how to create power from thin air. Their tiny device generates electricity from the air's humidity, and it can be made from nearly any substance, scientists reported this month in the journal Advanced Materials. The invention involves two electrodes and a thin layer of material, which must be covered with tiny holes less than 100 nanometers in diameter -- thinner than one-thousandth the width of a human hair, according to a statement from the University of Massachusetts, Amherst, where the researchers work. As water molecules pass through the device, from an upper chamber to a lower chamber, they knock against the tiny holes' edges, creating an electric charge imbalance between the layered chambers. In effect, it makes the device run like a battery. The whole process resembles the way clouds make electricity, which we see in the form of lightning bolts, according to Inverse's Molly Glick. [...] Currently, the fingernail-sized device can only create continuous electricity equivalent to a fraction of a volt, writes Vice's Becky Ferreira. But the researchers hope it can someday become a practical, sustainable source of power. Scientists have previously tried harnessing humidity to generate electricity, but their attempts have often only worked for a short amount of time or relied on expensive materials, per Vice. In 2020, Yao and other researchers found a way to continuously collect electricity from humidity using a material grown from bacteria. But now, the new paper shows that such a specific material isn't necessary -- just about any material works, such as wood or silicon, as long as it can be punctured with the ultra-small holes. This finding makes the device much more practical; it "turns an initially narrow window to a wide-open door for broad potential," Yao tells Vice.

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