Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8023207 | Surface and Coatings Technology | 2018 | 8 Pages |
Abstract
The current paper presents a combined ab initio and experimental study of H2 adsorption on carbon. Adsorption energetics of a H2 molecule on pristine graphene were obtained for various molecule orientations, showing that the perpendicular-to-surface orientation is energetically more preferable (Eadsâ¯=â¯â0.076eV/H2) than the parallel orientations (Eads ââ0.071eV/H2). Subsequently, B, Co, Ni, Pd, Pt and Ru substituents of a C atom in graphene were considered, leading to the conclusion that Pt and Ru promote the H2 adsorption by ââ0.012eV/H2. Pt promotes adsorption in all its neighbouring hexagons, while Ru impact is localised to the position directly above the dopant. Pure, Pt and Ru-doped ordered mesoporous carbon samples were evaluated experimentally for their H2 adsorption performance under a low-pressure regime (up to 1â¯bar) at cryogenic and room temperatures (i.e., 77 and 298â¯K, respectively). These experimental measurements indicated that, while the specific area of the metal-decorated carbons is lower than that of the pristine carbon material, the presence of Pt and Ru nanoparticles leads to a slight improvement of the H2 uptake performance at room temperature.
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Authors
David Holec, Nikolaos Kostoglou, Christos Tampaxis, Biljana Babic, Christian Mitterer, Claus Rebholz,