Introduction

Development of hydrogen fueled vehicles can bring economical and environmental benefits through a decrease in using oil, and, consequently, a decrease in air pollution and other greenhouse gases. The Department of

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Energy of the United States (DOE) has established different targets for onboard hydrogen storage systems, including the minimum "gravimetric" and "volumetric" capacity. For the 2010 year, the storage system should have a gravimetric capacity of 2 kWh/kg (6 wt.%) and a volumetric capacity of 1.5 kWh/L (0.045 kg H2/L). These values are referred to the whole system, including the storage medium, the vessel, the refuelling infrastructure, any regulators, electronic controllers, sensors, and so on (for more information see: www.eere.energy.gov/hydrogenandfuelcells). Therefore, the targets for the storage medium are very high and difficult to achieve.

In this work, we present experimental results corresponding to hydrogen adsorption at high pressures and different temperatures (77 and 298 K) for a wide variety of carbons materials in order to analyze the effect of the porosity on the hydrogen adsorption capacities in gravimetric basis. Likewise, we point out the importance of the packing density of the materials in order to obtain high hydrogen adsorption capacities in volumetric basis and high total storage capacities.

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