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FP5

CARDECOM Informe resumido

Project ID: G5RD-CT-2002-00685
Financiado con arreglo a: FP5-GROWTH
País: Germany

Low hydrogen storage capacity of carbon nanotubes

Literature data on the storage capacities of hydrogen in carbon nanostructures show a scatter over several orders of magnitude, which cannot be solely explained by the limited quantity or purity of these novel nanoscale materials. With this in mind, this article revisits important experiments. Thermal desorption spectroscopy, as a quantitative tool to measure the hydrogen storage capacity needs an appropriate calibration using a suitable hybride. Single walled carbon nanotubes that have been treated by ultra-sonication show hydrogen uptake at room temperature.

However, this storage can be assigned to metal particles incorporated during the sonication treatment. Reactive high-energie ball milling of graphite leads to a high hydrogen loading, however the temperatures for hydrogen release are far too high for application. In view of today’s knowledge, which is mainley based on experiment with small quantities and poorly characterised samples, carbon nanostructures at room temperature cannot store the amount of hydrogen required for automotive applications.

Reported by

MAX PLANCK INSTITUT FUER FESTKOERPERFORSCHUNG
Heisenbergstr 1
D 70569 STUTTGART
Germany
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