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Pouring Saltwater Over Graphene Generates Electricity

A team of Chinese scientists did an impossible-sounding thing. They created electricity simply by dragging a droplet of saltwater across a layer of graphene. No big fires, no greenhouse gases, no fuss. They created energy with just a miracle material and one of the most plentiful substances on Earth.

The science behind the effect is actually quite simple. When the droplets of saltwater sat static on the graphene, they carried an equal charge on both sides. But, when moved across the surface of the graphene, the electrons in the saltwater were desorbed on one end of the graphene and absorbed on the other, generating a measurable voltage along the way. The faster the water moves, the higher the voltage it generates—although the total voltage was still pretty low, about 30 millivolts. A standard AA battery, by comparison, produces about 1.5 volts. It helps that graphene is insanely conductive.

So that’s not much—not yet—but it’s something. It’s not the voltage that scientists are excited about, though. It’s the scale. Current hydroelectric power solutions can only exist on a very large scale. Think Hoover Dam. However, this method for producing hydroelectric power could support nano-sized generators without any byproducts. They do believe the method will scale up, too. That is, if anybody can afford that much graphene.

Source
http://themindunleashed.org/2014/04/pouring-saltwater-graphene-gene...

1 member likes this

Comment by Barry on April 19, 2014 at 21:13: The Dutch have already done this without using graphene.

Reverse Electro Dialysis is the most promising technique
method for extracting energy from the salt difference
between sea and river water. The method is inherently
sustainable and clean. In theory the Rhine can deliver 6000
megawatt energy on mixing with the Northsea. Assuming an
ideal process, there is no overall energy effect and the process
is balanced by cooling the effluent 0.2 degrees or so.
Extraction of a part of this 6000 MWatt is an exciting idea.

Comment by Barry on April 19, 2014 at 21:22: Blue Energy form the Afsluitdijk

Comment by Deborah Williams on April 20, 2014 at 3:35: Excellent info there Barry, I just knew that this would start a discussion.

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