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The modification of a glassy carbon (GC) electrode with platinum (PtNPs) and gold (AuNPs) nanoparticles is targeted to fabricate efficient anodes for the electrooxidation of formic acid (FA). A proper adjustment of the deposition sequence of PtNPs and AuNPs could eventually enhance the electrocatalytic activity of the electrode in such a way that suppresses the CO poisoning effect during FA oxidation. The highest catalytic activity is obtained at the Au/Pt/GC electrode (with PtNPs firstly deposited on the GC electrode followed by AuNPs). This superb enhancement is quantified by comparing the relative ratio of the direct vs. the indirect oxidation peaks at 0.3 and 0.65 V, respectively, at each electrode. The fundamental role of AuNPs (in Au/Pt/GC electrode) imparts immunity to the underlying PtNPs against CO poisoning by interrupting the contiguity of the Pt surface sites, thus, prevents the deterioration of the catalytic activity of the anode.