Carbide-derived carbons (CDC) are porous carbon materials with widely different properties like pore size distribution or graphitization . In this study, quasi-elastic neutron scattering method was used to investigate the hydrogen diffusion in the well-defined pores of three distinct CDC materials . Namely, the predominant shape of pores of the studied CDCs had been shown to be different as well as the respective pore size distributions . Two of the studied materials were mostly microporous, while the third mostly mesoporous. Using a combined approach of gas adsorption methods and in-situ quasi-elastic neutron scattering, some interesting insights were gained on the relation of local adsorbent structure and the molecular behaviour of confined hydrogen. It was shown that sub-nanometer pores of spherical and cylindrical shape strongly limit the diffusion of H$_2$. However, a much weaker adsorption was seen in mainly mesoporous CDC, resulting in higher H$_2$ mobility in that adsorbent. This demonstrates, that tailoring the pore structure of carbon materials can have a large effect on their H$_2$ storage capability.
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