Multi-wall carbon nanotubes were synthesised from the catalytic decomposition of CO and CH_4 on powder Co/La_2O_3 catalysts. TEM and HR-TEM, XRD, and TGA were used to characterise carbon nanotubes. It was found that by adjusting the composition of the catlysts, the size of the nanotubes was controllable and by annealing, the crystallinity could be improved. The carbon nanotubes prodcued from CO were found to be able to uptake a certain amount of hydrogen under ambient conditions, wheras graphite powders were unable, which suggestes taht the carbon nanotubes may be a promising material that can be used for hydrogen storage under ambient conditions.
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