Abstract
Alloying Pt with other transition metal is a promising method to accelerate the kinetics of oxygen reduction reaction (ORR). Herein, fully ordered Au-doped PtCo nanoparticles (L10-PtCoAu NPs) with a size of sub-4 nm are successfully synthesized by annealing the PtAu alloy which coated by CoO shell (PtAu@CoO) under H2 atmosphere. The artificially introduced vacancies during annealing process can accelerate the atomic diffusion, which is beneficial to the conversion from disordered alloy structure to intermetallic structure. And the addition of Au and Co atoms synergistically tunes the crystal and electronic structure of Pt. As a result, the electrochemical tests show that the mass activity of fully ordered L10-PtCoAu0.1/C catalyst is 1.08 A mgPt−1, which is 6 times higher than that of commercial Pt/C catalyst. Due to the protective effect of Au atoms and the stable ordered structure, the prepared L10-PtCoAu0.1/C catalyst show enhanced durability compared with commercial Pt/C after 20,000 potential cycles. This work provides a facile and scalable method to prepare small-sized Pt-based intermetallic alloy catalyst with improved activity and durability for ORR.
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