Deposition of a Nanostructured Au-Pt Binary System by Pulse Electrolysis in DMSO Medium

Abstract

Co-deposition of Au and Pt on glassy carbon (GC) from H[AuCl4] and PtCl2 solutions was studied in DMSO using pulse electrolysis. Nanoparticles of AuPt on GC from H[AuCl4] + PtCl2 + Bu4NClO4 solutions at E=-0.6$\ldots$-1.4V were deposited. The priority deposition of Au with its predominant content in the obtained binary system was established. It is shown that the main factor affecting the content of components in it is the concentration of precursors of co-deposited metals. The main factors influencing the size of AuPtNPs are the value of the cathode potential (Ecathode), the concentration ratio [HAuCl4]:[PtCl2] and the electrodeposition time. With the increase of Ecathode from -0.6 to -1.4V, the average nanoparticle size decreases from ∼200 to ∼60nm. The increase in the [HAuCl4]:[PtCl2] ratio provides the reduction of AuPtNPs size, while the increase in electrodeposition time increases the size.