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Hydrogen Confinement in Carbon Nanopores: Extreme Densification at Ambient Temperature...

by Nidia C Gallego, Lilin He, Dipendu Saha, Cristian I Contescu, Yuri B Melnichenko
Publication Type
Journal Name
Journal of the American Chemical Society
Publication Date
Page Numbers
13794 to 13797

In-situ small angle neutron scattering (SANS) studies of hydrogen confined in small pores of polyfurfuryl alcohol-derived activated carbon (PFAC) at room-temperature provided for the first time its phase behavior in equilibrium with external H2 at pressures up to 200 bar. The data was used to evaluate the density of the adsorbed fluid, which appears to be a function of both pore size and pressure, and approaches the liquid hydrogen density in narrow nanopores at 200 bar. The surface-molecule interactions responsible for densification of hydrogen within the pores create internal pressures which exceed by a factor of up to ~ 60 the external gas pressures, confirming the benefits of adsorptive over compressive storage. These results can be utilized to guide the development of new carbon adsorbents tailored for maximum hydrogen storage capacities at near ambient temperatures.