Aqueous-Phase Synthesis of Sub 10 nm Pd_core@Pt_shell Nanocatalysts for Oxygen Reduction Reaction Using Amphiphilic Triblock Copolymers as the Reductant and Capping Agent

Abstract

Sub 10 nm Pd core @Pt shell nanocrystals (NCs) were prepared by a facile and green reduction method in aqueous solutions using commercially available and nontoxic poly(ethylene oxide)−poly(propylene oxide)−poly-(ethylene oxide) amphiphilic triblock copolymers as the reductant, stabilizer, and capping agent. The growth mode and morphology of the Pt shell on the Pd surface can be adjusted simply by the Pt/Pd molar ratio. The activity of carbonsupported Pd@Pt NCs toward oxygen reduction reaction exhibited a Pt shell morphology dependence, with Pd 2 @Pt 1 (Pt/Pd molar ratio 1/2) having the highest mass activity and Pd 1 @Pt 2 (Pt/Pd molar ratio 2/1) having the best areaspecific activity, and both of them were significantly enhanced in comparison with that of commercial Pt/C catalysts. Moreover, single-fuel-cell testing indicated superior activity and durability of Pd 2 @Pt 1 NCs, which made Pd 2 @Pt 1 NCs promising cathode catalysts for fuel cell applications.

A Strategy for Fabricating Porous PdNi@Pt Core-shell Nanostructures and Their Enhanced Activity and Durability for the Methanol Electrooxidation

“…Meanwhile, the Pt 4f binding energies negetively shift ca. 0.15 eV relative to Pt black (Figure S5), which may be ascribed to the compressive strain introduced by PdNi substrate37, and the electron donation induced by Pd and Ni with smaller electronegativity (Pt, 2.28; Pd, 2.20; Ni, 1.91)38.…”

Carbon-Supported Pt-Based Alloy Electrocatalysts for the Oxygen Reduction Reaction in Polymer Electrolyte Membrane Fuel Cells: Particle Size, Shape, and Composition Manipulation and Their Impact to Activity

“…Zhang et al 306 prepared sub-10 nm carbon-supported Pd(core)@Pt(shell) supported on carbon nanocatalysts by an aqueous-phase synthesis method and compared them with traditional Pt−Pd bulk alloys supported on carbon. They controlled the growth mode and morphology of the Pt shell on the Pd surface by simply adjusting the nominal Pt:Pd molar ratio.…”

Facile Solvothermal Synthesis of Pt4Co Multi‐dendrites: An Effective Electrocatalyst for Oxygen Reduction and Glycerol Oxidation

“…The MA values are 279.14, 64.82, 91.32, and 20.33 mA mg −1 Pt for Pt 4 Co MDs, Pt 3 Co NPs, Pt 5 Co NPs, and Pt black, respectively (Figure B). Moreover, The SA (0.89 mA cm −2 ) of Pt 4 Co MDs is much higher than the contrast materials (0.35, 0.53 and 0.10 mA cm −2 for Pt 3 Co NPs, Pt 5 Co NPs and Pt black, respectively), and comparable or even larger than those of Pd core @Pt shell nanocatalysts (0.52 mA cm −2 Pt ) and AuPt nanodendrites (56.44 mA mg −1 Pt ), Pt 85 −Co 5 −Sn 10 NPs/C (35.48 mA mg −1 Pt ), strongly displaying the superior ORR activity of the Pt 4 Co MDs catalyst.…”