Rivers could generate thousands of nuclear power plants worth of energy, thanks to a new ‘blue’ membrane

Boron nitride nanotube membrane creates power by controlling the flow of electrically charged ions in water

Green energy advocates may soon be turning blue. A new membrane could unlock the potential of “blue energy,” which uses chemical differences between fresh- and saltwater to generate electricity. If researchers can scale up the postage stamp–size membrane in an affordable fashion, it could provide carbon-free power to millions of people in coastal nations where freshwater rivers meet the sea.

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