Editor's note: When fresh water in a river meets salt water in the ocean, the difference in salt concentration between the two will produce osmotic pressure. The principle of osmotic energy power generation is to install a semi-permeable membrane between fresh water and salt water. The pressure exerted by the membrane pushes the turbine to generate electricity. However, the current generation power per square meter of semi-permeable membranes is only 3 watts, which is not enough for use. French researchers designed an experimental device consisting of an insulating waterproof membrane and boron-nitrogen nanotubes with an external diameter of tens of nanometers. The intensity of the current through the nanotube is 1,000 times more efficient than current technology.
The French National Research Center recently issued a communiqué saying that researchers at the institution have developed a nanotube that can convert osmotic energy into electrical energy, with a power generation capacity 1,000 times higher than current technology.
Osmotic energy is a new energy to be developed and utilized. When the fresh water of a river meets the salt water of the ocean, the difference in salt concentration between the two will produce osmotic pressure. The principle of osmotic energy power generation is to install a semi-permeable membrane between fresh water and salt water. The pressure pushes the turbine to rotate to generate electricity. However, the current generation power per square meter of semi-permeable membranes is only 3 watts, which cannot be put into use.
The researchers designed an experimental device consisting of an insulating waterproof membrane and boron-nitrogen nanotubes with an external diameter of tens of nanometers. They let the nanotubes pass through the film, and inserted electrodes at the ends of the nanotubes. When fresh water and salt water are placed on both sides of the film, the intensity of the current passing through the nanotubes is measured to be 1,000 times more efficient than current technology. The researchers believe that this is due to the large amount of negative charge attached to the surface of the boron-nitrogen nanotubes, which can attract cations in salt water.
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