Thin films of Carbon-supported Co-B nanoparticles were synthesized by using Pulsed Laser Deposition (PLD) and used as catalysts in the hydrolysis of Ammonia Borane (AB) to produce molecular hydrogen. Amorphous Co-B-based catalyst powders, produced by chemical reduction of cobalt salts, were used as target material for nanoparticles-assembled Co-B film catalysts preparation through PLD. Various Ar pressures (10-50 Pa) were used during deposition of carbon films to obtain extremely irregular and porous carbon support with high surface area prior to Co-B film deposition. Surface morphology of the catalyst films was studied using Scanning Electron Microscopy, while structural characterization was carried out using X-Ray diffraction. The hydrogen generation rate attained by carbon-supported Co-B catalyst film is significantly higher as compared to unsupported Co-B film and conventional Co-B powder. Almost complete conversion (95%) of AB was obtained at room temperature by using present film catalyst. Morphological analysis showed that the Co-B nanoparticles produced after the laser ablation process act as active catalytic centers for hydrolysis while the carbon support provides high initial surface area for the Co-B nanoparticles with better dispersion and tolerance against aggregation. The efficient nature of our carbon-supported Co-B film is well supported by the obtained very low activation energy (similar to 29 kJ (mol)(-1)) and exceptionally high H-2 generation rate (13.5 L H-2 min(-1) (g of Co)(-1)) by the hydrolysis of AB.
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|Titolo:||Co-B nanoparticles supported on carbon film synthesizedby pulsed laser deposition for hydrolysis of ammonia borane|
|Autori:||Patel, Nainesh Kantilal; Fernandes, Rohan Pascal; Santini, Alessandra; Miotello, Antonio|
|Titolo del periodico:||INTERNATIONAL JOURNAL OF HYDROGEN ENERGY|
|Anno di pubblicazione:||2012|
|Numero e parte del fascicolo:||2|
|Codice identificativo Scopus:||2-s2.0-84855649535|
|Codice identificativo ISI:||WOS:000300470100088|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1016/j.ijhydene.2011.06.059|
|Appare nelle tipologie:||03.1 Articolo su rivista (Journal article)|