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Monday, 9 May 2011

Batteries that run on sea water

It's true! A team from Stanford University is attempting to develop batteries that run on sea water, or more specifically entropic energy which can be extracted from the difference in salinity between fresh water and sea water. The process uses ions of sodium and chlorine, of which there are more in sea water. They use fresh water to start off with. The fresh water is charged and then subsequently drained and replaced by sea water. The charge is held inside one of the two electrodes which is made of manganese dioxide (the other electrode being made of silver). There is no need for a membrane as in other new types of battery. I've written an article on this for AskTheExperts which you can find here:

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Energy & Environment Dates 2012