The aim of this study was to investigate the activity of CeO₂/C and Nb₂O₅/C supported platinum nanoparticles composites, prepared by the rapid microwave synthesis method, towards the oxidation of ethanol in an alkaline medium. The electrocatalytic activity of the Pt-CeO₂/C and Pt-Nb₂O₅/C catalysts with respect to the electro-oxidation of ethanol was investigated by means of cyclic voltammetry. The electrochemical behaviour of the synthesized catalysts towards the oxidation of ethanol was compared with that of a carbon supported bare Pt catalyst. X-ray Diffraction and Transmission Electron Microscopy were used to determine the structure, shape and the size of catalysts particles. Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES) was employed to determine the composition of the synthesized catalysts.
It has been found that the both investigated Pt-CeO₂/C and Pt-Nb₂O₅/C catalysts show a higher activity towards the electro-oxidation of ethanol when compared with that of the Pt/C catalyst, the Pt- Nb₂O₅/C catalyst being most active.

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