Highly active PdAu alloy catalysts for ethanol electro-oxidation

► Alloyed PdmAu NPs are prepared through the co-reduction of K2PdCl4 and HAuCl4 precursors. ► The addition of Au into Pd catalysts improves the catalytic activity and stability of Pd for EOR. ► Proper proximity and relative amount of Au and Pd are crucial for the promotion effect of Au.