An optimization study of PtSn/C catalysts applied to direct ethanol fuel cell: Effect of the preparation method on the electrocatalytic activity of the catalysts

► We have optimized the preparation of PtSn/C catalysts by the microwave-assisted method. ► The microwave-assisted heating promotes nanoelectrocatalysts with high current density. ► This method requires short preparation time, which is advantageous compared to other methods proposed in the literature. ► Propylene glycol and sodium acetate produces nanocatalysts with ranging from 2.0 to 5.0 nm and high catalytic activity