Hydrogen Storage in Porous Materials: Status, Milestones, and Challenges.

In this account the most relevant advancements in hydrogen storage in porous materials are presented. These include the current state-of-the-art, the challenges which have been overcome, and the hurdles which still remain. The most important milestones which will be discussed in this work will be the development of new apparatuses capable of delivering reliable results under a broad range of operational conditions, in which analysis temperature and pressure are critical parameters. Other aspects such as the materials storage capacity in gravimetric and volumetric terms will be critically discussed to identify the conditions required from an ideal material. Finally, different upgrade possibilities from modifying the adsorbate-adsorbent interaction to using rigid or flexible materials will be presented and put into perspective with current literature.