Abstract
The nanostructured gold–cobalt catalysts were deposited onto titanium surface via galvanic displacement technique. The electrocatalytic activity of the as-prepared nanostructured Au(Co)/Ti catalysts was examined in respect to the oxidation of BH4− ions in alkaline medium by using of the cyclic voltammetry and chrono-techniques. The nanostructured catalysts were prepared via galvanic displacement reactions between hierarchical Co thin films prepared by electroless deposition and a solution of HAuCl4. The surface morphology and composition of the samples were characterized using Field Emission Scanning Electron Microscopy, Energy Dispersive X-ray Spectroscopy and X-ray diffraction. The prepared nanostructured Au(Co)/Ti catalysts exhibit an enhanced electrochemical activity towards the electro-oxidation of H2 generated by catalytic sodium borohydride hydrolysis and oxidation of BH4− ions.
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