Formic Acid Oxidation of Electrodeposited Platinum Nanostructures on Graphene Oxide Modified Electrode in Acid Medium

Abstract

In this report, we investigated an electrochemical oxidation of formic acid using electrodeposited platinum (Pt) nanostructures on graphene oxide (GO) coated glassy carbon (GC) electrode. The modified electrode is well characterized with the aid of cyclic voltammetry (CV), scanning electron microscopy (SEM), X-ray diffraction (XRD) and Raman analyses. A crystalline flower-like Pt nanostructures were found on GO modified electrode. The GO-Pt modified electrode displayed improved catalytic current signal in formic acid oxidation than the bare GC and Pt nanastrutures modified electrodes. The loading of GO amount dependent catalytic performance was studied to optimize the GO amount for the efficient electrocatalytic activity. The mass activity of the GO-Pt modified electrode is 2.2 times higher than the Pt modified electrode in formic acid electrooxidation. The GO-Pt nanostructures show good stability in amperometric i-t curve and consequently, show the higher turnover number than the only Pt modified electrode.