Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1276958 | International Journal of Hydrogen Energy | 2010 | 8 Pages |
We prepared activated carbons (ACs) that are among the best adsorbents for hydrogen storage. These ACs were prepared from anthracites and have surface areas (SBET) as high as 2772 m2 g−1. Anthracites activated with KOH presented the highest adsorption capacities with a maximum of 5.3 wt.% at 77 K and 4 MPa. Non-linearity between hydrogen uptake at 77 K and pore texture was confirmed, as soon as their SBET exceeded the theoretical limiting value of (geometrical) surface area, i.e., SBET > 2630 m2 g−1. We separated adsorption and compression contributions to total hydrogen storage. The amount of hydrogen stored is significantly increased by adsorption only at moderate pressure: 3 MPa and 0.15 MPa at 298 and 77 K, respectively. Hydrogen adsorption on ACs at high pressure, above 30 MPa at 298 K and 8 MPa at 77 K, has not interest because more gas can be stored by simply compression in the same tank volume.