Hydrogen storage: a comparison of hydrogen uptake values in carbon nanotubes and modified charcoalsH.-Y. Miao, G. R. Chen, D. Y. Chen, J. T. Lue and M. S. YuEur. Phys. J. Appl. Phys., 52 2 (2010) 21101DOI: https://doi.org/10.1051/epjap/2010140