Kinetic effect of Pd additions on the hydrogen uptake of chemically-activated ultramicroporous carbon

The effect of mixing chemically-activated ultramicroporous carbon (UMC) with Pd nano-powder is investigated. Results show that Pd addition doubles the rate of hydrogen uptake, but does not enhance the hydrogen capacity or improve desorption kinetics. The effect of Pd on the rate of hydrogen adsorption supports the existence of the hydrogen spillover mechanism in the Pd - UMC system. (C) 2010 Elsevier Ltd. All rights reserved.