Trimetallic PtNiCo branched nanocages as efficient and durable bifunctional electrocatalysts towards oxygen reduction and methanol oxidation reactions. Issue 41 (12th October 2021) - Ma, Hengrui
Abstract : A trimetallic PtNiCo branched nanocage was fabricated via an etching process. The optimized electronic structure with Co and Ni accelerate the sluggish kinetic process in ORR and MOR with significantly catalytic enhancement and high durability. Abstract : Engineering the composition and structure of Pt-based alloy electrocatalysts has exhibited great promise for enhancing activity and durability in the oxygen reduction reaction (ORR) and methanol oxidation reaction (MOR). However, it remains a great challenge to completely achieve this goal because of 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 compared to Pt/C. Detailed investigations reveal that the most optimized electronic structure for the d-band center (a 0.17 eV downshift compared to pure Pt) by the alloying effect of Co and Ni contributed 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 fuel cells.