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As a basis for the evaluation of hydrogen storage by physisorption, adsorption isotherms of H 2 were experimentally determined for several porous materials at 77 K and 298 K at pressures up to 15 MPa. Activated carbons and MOFs were studied as the most promising materials for this purpose. A noble focus was given on how to determine whether a material is feasible for hydrogen storage or not, dealing with an assessment method and the pitfalls and problems of determining the viability. For a quantitative evaluation of the feasibility of sorptive hydrogen storage in a general analysis, it is suggested to compare the stored amount in a theoretical tank filled with adsorbents to the amount of hydrogen stored in the same tank without adsorbents. According to our results, an ''ideal'' sorbent for hydrogen storage at 77 K is calculated to exhibit a specific surface area of >2580 m 2 g À1 and a micropore volume of >1.58 cm 3 g À1 .

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