Co-B nanoparticles supported over carbon films were synthesized by using pulsed laser deposition (PLD) and used as catalysts in the hydrolysis of sodium borohydride (NaBH4) 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 and transmission electron microscopy, while structural characterizations were 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 to conventional Co-B powder. Morphological analysis along with NaBH4 hydrolysis tests showed that the Co-B nanoparticles produced with PLD 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 hydrogen generation rate obtained by the present catalyst film was also investigated as a function of Co-B loading, carbon morphology, and solution temperature. The high performance of our carbon-supported Co-B film is well supported by the obtained very low activation energy (∼31 kJ (mol)-1) and exceptionally high H2 generation rate (8.1 L H2 min-1 (g of catalyst) -1) in the hydrolysis of NaBH4.
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|Titolo:||Enhanced hydrogen production by hydrolysis of NaBH4 using Co-B nanoparticles supported on Carbon film catalyst synthesized by pulsed laser deposition|
|Autori:||Patel, Nainesh Kantilal; Fernandes, Rohan Pascal; Bazzanella, Nicola; Miotello, Antonio|
|Titolo del periodico:||CATALYSIS TODAY|
|Anno di pubblicazione:||2011|
|Codice identificativo Scopus:||2-s2.0-79958817985|
|Codice identificativo ISI:||WOS:000291799100004|
|Digital Object Identifier (DOI):||10.1016/j.cattod.2010.11.077|
|Appare nelle tipologie:||03.1 Articolo su rivista (Journal article)|