Abstract
The electrochemical behavior of methanol on a binary catalyst composed of platinum and bismuth nanoparticles electrodeposited consecutively onto a pre- electro-activated glassy carbon electrode has been investigated. Either platinum was deposited first followed by bismuth or the reverse. The modified electrodes were morphologically characterized using scanning electron microscopy and their composition were probed using energy dispersive x-ray. The crystallography of the thus deposited nanoparticles was explored using XRD. Modified electrodes, i.e., Pt/Bi/GC (Bi deposited first) and Bi/Pt/GC electrodes (Pt deposited first) were electrochemically characterized using cyclic voltammetry and chronoamperometry. It has been found that the electrocatalytic activity critically depends on the order of the deposition of platinum and bismuth. The Pt/Bi/GC electrode showed a larger electrocatalytic activity towards methanol oxidation compared to Bi/Pt/GC electrode. The higher activity obtained at the former electrode is attributed to the cooperative effect of Pt and Bi towards methanol oxidation. Keywords: Platinum nanoparticles, bismuth, Electrodeposition, Methanol electro-oxidation.
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