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Binary alloys; Chemical stability; Cobalt alloys; Electrocatalysts; Electrolytic reduction; Fuel cells; Nanocatalysts; Oxygen; Oxygen reduction reaction; Platinum; Ruthenium; Ruthenium alloys; Surface active agents; X ray absorption, Initial state; Large scale productions; Membrane electrode assemblies; Orr activities; Oxygen reduction catalysts; Practical fuels; Ruthenium doped; Surfactant-free, Platinum alloys
Abstract:
Developing a large-scale method to produce platinum (Pt)-based electrocatalysts for the oxygen reduction reaction (ORR) is highly desirable to propel the commercialization of the membrane electrode assembly (MEA). Here, we successfully report the large-scale production of surfactant-free ruthenium-doped Pt-cobalt octahedra grown on carbon (Ru-Pt3Co/C), which display a much higher ORR activity and stability and MEA stability than Pt3Co/C and Pt/C. Significantly, the in-situ X-ray absorption fine structure result reveals that Ru can drive the reduced Pt atoms to reverse to their initial state after the ORR by transferring a redundant electron from Pt to Ru, preventing the over-reduction of Pt active sites and boosting the chemical stability. Theory investigations further confirm that the doped Ru can accelerate the breach and desorption of oxygen intermediates, making it active and durable for the ORR. The present work sheds light on the exploration of a large-scale strategy for producing advanced Pt-based nanocatalysts, which may offer significant advantages for practical fuel cell applications in the future. © 2021 American Chemical Society.
