Sun + Water = Hydrogen Gas
Thanks to a new discovery, we may in the future be using solar energy during the day and hydrogen turbines or fuel cells during the night:
A new technique can convert 60% of sunlight energy absorbed by an electrode into hydrogen gas. Organic molecules have been used before to perform the same feat. But they are quickly bleached by the sunlight they are collecting, rendering them inefficient after a few weeks. The inorganic materials used in the University of East Anglia's system are more resilient. Their first generation proof of concept is "a major breakthrough" thanks to its efficiency of over 60% and ability to survive sunlight for two weeks without any degradation of performance.
http://www.newscientist.com/article/dn18511-sunpowered-water-splitter-makes-hydrogen-tirelessly.html
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