Researchers at Stanford University in the United States recently invented a "water" battery that can use the difference in salinity between fresh water and seawater to generate electricity. This invention opens up a new path for the development and utilization of new energy.
The researchers explained that the battery principle is very simple, and its positive and negative poles are immersed in a liquid containing ions (sodium and chloride). When generating electricity, fresh water is first injected into the battery, charged with a minute current, and then the freshwater is drained and replaced with sea water, because the sea water contains 60 to 100 times more ions than fresh water. This increases the number of positive and negative poles. Between the voltage, the electrical energy generated at this time is much larger than the electrical energy that was originally used to charge. When the electrical energy is released, the seawater is replaced by fresh water and a new cycle begins.
The researchers said that in order to improve efficiency, the positive electrode of the battery can be made of manganese dioxide nanorods because the surface area of ​​the material interacting with sodium ions will be greatly increased compared to other materials, and the nanorods will allow sodium ions to enter and exit. The electrode is more convenient.
This result has been published in the new issue of Nano News.
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