Trimetallic PtNiCo branched nanocages as efficient and durable bifunctional electrocatalysts towards oxygen reduction and methanol oxidation reactions

Engineering the composition and structure of Pt-based alloy electrocatalysts has exhibited great promise for enhancing activity and durability in oxygen reduction reaction (ORR) and methanol oxidation reaction (MOR). However, it remains a great challenge to completely achieve this goal for the sluggish kinetics and surface CO poisoning. Herein, we successfully constructed trimetallic PtNiCo branched nanocages via a simple etching treatment. The trimetallic PtNiCo nanocages exhibited outstanding activity and durability in both acidic ORR and MOR. Strikingly, the mass activity of the catalyst in ORR and MOR reached 1.03 A mgPt-1 and 2.82 A mgPt-1, with 13.8- and 5.6-times enhancement of specific activity higher than that of Pt/C. Detailed investigations reveal that the best optimized electronic structure for d-band center (0.17 eV downshift than pure Pt) by alloying effect of Co and Ni attributed to the enhanced performances and great CO-tolerance of such unique Pt-based catalysts, which provide a new perspective for designing high-performance electrocatalysts for commercial full cells.