Kinetics of Sodium Borohydride Hydrolysis at the Cobalt with a Fiber Structure Modified with Gold Nanoparticles
This work presents the study of catalytic activity of cobalt with a fiber structure deposited on the copper surface and modified with gold nanoparticles towards the hydrolysis of borohydride. Cobalt coatings with the thickness of ~3 µm were deposited from the electrolyte described in Ref. . Au crystallites were deposited on the Co/Cu surface (denoted as Au(Co)/Cu) via the galvanic displacement technique. The Co/Cu catalysts were immersed into the 1 mM HAuCl4 + 0.1 M HCl solution at 25 oC for 0.5, 1 and 5 min, respectively . The morphology, structure and composition of the prepared catalysts were examined by means of Field Emission Scanning Electron Microscopy, Energy Dispersive X-ray Spectroscopy, X-ray diffraction and Inductively Coupled Plasma Optical Emission Spectroscopy.
It has been determined that the Au loadings were 10.8, 22.4 and 84.4 µg cm-2 in the prepared Au(Co)/Cu catalysts after the immersion of Co/Cu into the gold-containing solution for 0.5, 1 and 5 min, respectively. The data of hydrogen generation from an alkaline sodium borohydride solutions using the Co/Cu and different Au(Co)/Cu catalysts under various conditions are presented.
It has been determined that the temperature and amount of catalysts have exceptional influence on the rate of hydrogen generation from alkaline sodium borohydride solutions.
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