Robert Clark wrote:
...
The Department of Energy has set the ultimate goal for hydrogen energy
storage to be superior to that of gasoline as above 10 MJ energy stored
per kg of total weight and 10 MJ per L of total volume. At an energy
content of hydrogen at 142 MJ per kg, this means about .07 kg of H2 per
kg of total storage system weight and .07 kg of H2 per liter of total
storage system volume.
A material that might be able to reach these criteria is "tetrahedral
amorphous diamond" if used in the form of microspheres.
This report gives an average tensile stength of 7.3 GPa when tested on
micron-scale samples:

Young's modulus, Poisson's ratio and failure properties of
tetrahedral amorphous diamond-like carbon for MEMS devices.
J. Micromech. Microeng. 15 (2005) 728-735
doi:10.1088/0960-1317/15/4/009
http://ej.iop.org/links/q03/3NXzoBo,...jmm5_4_009.pdf

...

That link should be:

Young's modulus, Poisson's ratio and failure properties of
tetrahedral amorphous diamond-like carbon for MEMS devices.
J. Micromech. Microeng. 15 (2005) 728-735
http://ej.iop.org/links/q41/OYlAji77...jmm5_4_009.pdf


Bob Clark