Greek scientists have come up with new possible mechanism for storing hydrogen
for use in fuel cells
. They have developed a way to produce rolled up sheets of carbon, referred to as carbon nanoscrolls. The team led by George Froudakis
has been experimenting with adding various alkali metals to the carbon which allows the distance between individual carbon atoms to be expanded. That extra space allows hydrogen atoms to be stored in the rolled sheets of carbon.
So far the best candidate has lithium ions which when mixed in to the carbon allows the material to store up to 3.31 percent of it's weight in hydrogen at atmospheric pressure and room temperature. If the temperature of the carbon is reduced the hydrogen absorption increases even more. Unfortunately all of this is so far only simulated. The next step will be to try and verify this experimentally.
[Source: New Scientist Tech]