Abstract
The reported hydrogen uptake of carbon nanotubes (CNTs) has been the subject of much controversy. We have measured the hydrogen uptake capacity of different types of CNTs using a volumetric measurement setup specifically-designed for CNTs. It was found that under a pressure of ∼12 MPa and at room temperature, the hydrogen storage capacity of the CNTs is less than 1.7 wt.%, which is far below the benchmark set for on-board hydrogen storage systems by the US Department of Energy. These results suggest that it is no longer worth investigating hydrogen uptake in pure CNTs for on-board applications. However, our recent research indicates that CNTs can be an effective additive to some other hydrogen storage materials to improve their kinetics.
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