The Graphene, Graphite and Carbon Nanotube Research Board

[riverrock]

I wonder if they can use a Graphene membraine?

Clean Energy Breakthrough Could Turn Estuaries Into Power Stations

http://europe.newsweek.com/scientists-generate-electricity-salt-water-unparallel-efficiency-480049

excerpt
The potential of the new system is huge, with the researchers calculating that a 1m² membrane would be able to produce enough electricity to power 50,000 standard energy-saving light bulbs.
Before this technology can be scaled up in this way, however, scientists need to find a way to make relatively uniform pores.