Hydrogen has huge potential as a clean fuel: it's abundant (mainly in compounds like water), it doesn't produce any damaging emissions, and it can also be used to store energy from solar, wind, and tidal sources.
There are challenges in producing enough of the stuff in a practical and affordable way, however. Splitting hydrogen from water can require complicated technology and also relies on pure freshwater – not something that's plentifully available everywhere.
What's more, it's capable of operating in areas where the humidity – the concentration of water vapor in the air – is as low as 4 percent. The electrodes sit on either side of a water harvesting unit, a sponge-like material that absorbs water from the air but which also doubles up as an electrolyte reservoir. Both electrodes are isolated from the air, which means hydrogen and oxygen can be collected as pure gases once the split has happened.
"This so-called direct air electrolysis module can work under a bone-dry environment with a relative humidity of 4 percent, overcoming water supply issues and producing green hydrogen sustainably with minimal impact to the environment,"Clean drinking water is at a premium in most places, so this device could be used in any location without depleting reserves. However, it's likely to be of most use in arid or semi-arid regions where there's not much water around at all.
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