In this proposal, we seek to use quasielastic neutron scattering (QENS) to investigate the phase behaviour of molecular or di-hydrogen (H2) in cylindrical and slit-shaped pores of size < 1 nm as a function of temperature and pressure. The goal is to provide a new insight into hydrogen diffusion and uptake in materials of interest as hydrogen storage media. The project will improve fundamental understanding of hydrogen phase behaviour caused by confinement, and will lead to better design and identification of new storage materials for sustainable energy applications.