Hydrogen storage by alkali-doped carbon nanotubes-revisited

In this study, an attempt is made to reexamine the experimental results for using alkali-doped carbon nanotubes for hydrogen storage. The main observation is that special caution needs to be taken to remove any moisture contamination from the hydrogen in measuring hydrogen storage in alkali-doped carbon nanotubes or graphite. Moisture drastically increased the weight gain by reactions with the alkali species on carbon. However, in dry hydrogen, it appears that alkali-doped carbon nanotubes can still adsorb nearly 2 wt.% hydrogen.