Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 645, Issue -, Pages S485-S489Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2014.12.076
Keywords
Hydrogen storage; Single wall carbon nanohorns; Thermal oxidation under air; Palladium doped carbons; Weak chemisorption
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Single wall carbon nanohorns as well as their thermally oxidized derivatives were decorated with Pd nanoparticles and their H-2 sorption performance was examined at 298 K up to 20 bar. The specific surface area of the nanohorns was increased through air oxidation, while both the thermal treatment and the metal doping led to the enhancement of the H-2 uptake. The higher uptake of the hybrid materials could not be attributed only to the additive effect of the carbon support and Pd content suggesting the existence of a cooperative mechanism between the metal particles and the carbon surface. This weak chemisorption process was found to be fully reversible after mild heating; still, its contribution to the overall H-2 uptake was not found to be of great significance. (C) 2014 Elsevier B.V. All rights reserved.
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