Abstract
Microwave irradiation is a simple yet effective way of altering the properties of multiwalled carbon nanotubes (MWNTs). This work studies the interactions between microwave-irradiated MWNTs and hydrogen. Effects of MWNT diameter and irradiation duration on the hydrogen-storage capacity have been investigated. We find that microwave irradiation induces damage to the MWNTs that can enhance hydrogen-storage capacity, with excessive damage being detrimental. Smaller-diameter tubes suffer less damage than larger tubes do. MWNTs with a diameter of 20–40 nm irradiated for 10 min had the highest hydrogen uptake of the samples measured, of 0.87 wt% at room temperature and under a hydrogen pressure of 3 MPa. Neutron powder-diffraction data revealed structural changes that were consistent with the insertion of hydrogen in the interstitial cavities of the microwave-irradiated MWNTs, as well as an expansion between the graphene layers of samples that were microwave irradiated. Hence, this simple treatment could be a promising solution to improve the hydrogen-storage capacities of MWNTs.
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The authors would like to acknowledge the financial support provided by the CSIRO Flagship Collaborative Research Program–National Hydrogen Materials Alliance.
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Lee, Y.T., Tsai, P.J., Peterson, V.K. et al. A microstructural and neutron-diffraction study on the interactions between microwave-irradiated multiwalled carbon nanotubes and hydrogen. J Mater Sci 51, 1308–1315 (2016). https://doi.org/10.1007/s10853-015-9448-4
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DOI: https://doi.org/10.1007/s10853-015-9448-4