Abstract
Well-adherent gold-coated copper films (Au/Cu), with particles of a few nanometers in size have been prepared on the titanium surface by a two-step process which involves electroless copper deposition followed by spontaneous galvanic displacement of Cu by Au from its tetrachloro-complex solution. The morphology and composition of the prepared catalysts have been characterized using field-emission scanning electron microscopy and energy dispersive X-ray analysis. The electrocatalytic activities of the nanostructured Au(Cu) catalysts deposited on the titanium surface have been investigated towards oxidation of BH4- ions in an alkaline medium by cyclic voltammetry and chronoamperometry. The nanostructured Au(Cu)/Ti catalysts exhibit a significantly higher electrocatalytic activity and stability towards the electrooxidation of BH4- ions in an alkaline medium as compared to that of bare Au or Cu/Ti.
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