Abstract Submitted to the NANOTUBE-99 Workshop:

One still unsolved problem for the use of hydrogen as clean fuel is the safe and efficient storage of hydrogen. Currently cryo tanks, gas bottles or metal hydrides are used. Important parameters are weight and volume density, cost and safety. Recent publications [1-3] claimed that large amounts of hydrogen can be stored reversibly in carbon nanotubes from the gas phase. Similar to a gas phase experiment where the storage material is charged with hydrogen by increasing the pressure one can also do this electrochemically. We report [4] that carbon nanotube can be charged reversibly with hydrogen with amounts exceeding metal hydrides. Samples with different degrees of purity were used and the capacity scales roughly with the percentage of nanotubes in the sample.

[1] Hill, 'Green Cars go farther with graphite', New Scientist, 12/28 December 1996
[2] Dillon, 'Storage of hydrogen in single-walled carbon nanotubes', Nature Vol 386, 27 March 1997, pp 377
[3] Chambers, J. Phys. Chem. B 102 (1998) 4253
[4] Nuetzenadel, Electrochem. and Sol. State Lett., 2 (1) 30 (1999)

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