Abstract
Carbon supported Pt-Sn alloy catalysts were prepared by reduction of Pt and Sn precursors with formic acid and characterised by X-ray diffraction, high resolution transmission electron microscopy and X-ray absorption near- edge structure analyses. Their electrocatalytic activity for ethanol oxidation was compared with commercial Pt/C and Pt3Sn/C electrocatalysts. The synthetized PtSn catalysts presented a low degree of alloy formation and high contents of Sn oxides. The electrocatalytic activity for ethanol oxidation in linear sweep voltammetry experiments at room temperature is greatly enhanced, mainly at low potentials, on Pt3Sn and Pt2Sn catalysts prepared by reduction with formic acid, while only a slight improvement is observed on Pt9Sn prepared with formic acid. On the other hand, a commercial Pt3Sn catalyst with a high degree of alloying showed the highest current performance as anode material in a direct ethanol fuel cell (DEFC) operating at 90 and 110 oC.
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