Abstract
Carbon-supported ternary Pt70Sn10In20, Pt70Sn15In15 and Pt70Sn20In10/C electrocatalysts were synthesized by co-impregnation method for the electrooxidation of ethanol in membraneless fuel cells. The resulting catalysts were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and energy-dispersive X-ray spectroscopy (EDX) analyses compared to Pt50Sn50, Pt50In50 and Pt100/C catalysts produced in the same way. The results revealed that all catalysts showed a similar particle morphology and the lattice constant of Pt–Sn–In was between Pt–Sn and Pt–In. Cyclic voltammetry (CV) and chronoamperometry (CA) showed that the Pt–Sn–In catalyst has improved electrocatalytic activity for ethanol oxidation compared to Pt–Sn and Pt–In catalysts, which is in agreement with the results of the single cell test. The improvement in activity is due to a greatly increased electrochemically active surface and the promoting function of indium.
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