Neutron scattering is one of the few experimental techniques that can directly determine the state of confined H2 molecules in microporous solids. Recent inelastic neutron scattering (INS) measurements confirmed the role of optimal pore dimension in compressing and densifying the adsorbed hydrogen. However, the effects of pore geometry on hydrogen densification of nanoporous materials are still unclear. This proposal is designed to correlate the pore geometries of a select range of carbon nanomaterials with the levels of hydrogen densification observed using neutron scattering, to determine the optimal pore geometries needed for higher-performing nanoporous carbon hydrogen storage materials.