Abstract
Control of structure and morphology of Pt-based nanomaterials is of great importance for electrochemical energy conversions. In this work, we report an efficient one-step synthesis of bimetallic porous AuPt nanoparticles (PAuPt NPs) in an aqueous solution. The proposed synthesis is performed by a simple stirring treatment of an aqueous reactive mixture including K2PtCl4, HAuCl4, Pluronic F127 and ascorbic acid at a pH value of 1 without organic solvent or high temperature. Due to their porous structure and bimetallic composition, as-made PAuPt NPs exhibit excellent electrocatalytic activity for oxygen reduction reaction.
Highlights
Pt and Pt-based nanomaterials are the most effective electrocatalysts for oxygen reduction reaction (ORR) and methanol oxidation reaction (MOR) in the proton-exchange membrane (PEM) fuel cell [1,2,3,4,5], which has the properties of high power density and high energy-conversion efficiency
Commercial carbon-supported Pt catalyst (20 wt%, Pt/C) was purchased from Alfa Aesar[AQ3]; K2PtCl4, HAuCl4, ascorbic acid (AA) and HCl were obtained from Sinopharm Chemical Reagent Co. (Shanghai, China), Ltd; Nafion (5 wt%) and Pluronic F127 ((PEO)100(PPO)65(PEO)100, Mw = 12600) were ordered from Sigma (Missouri, America)
In the selected-area electron diffraction (SAED) pattern (Figure S2), the concentric rings from inside to outside could be assigned to (111), (200), (220) and (311) of fcc crystal diffractions of metals, which demonstrated the polycrystalline nature of the PAuPt nanoparticles
Summary
Pt and Pt-based nanomaterials are the most effective electrocatalysts for oxygen reduction reaction (ORR) and methanol oxidation reaction (MOR) in the proton-exchange membrane (PEM) fuel cell [1,2,3,4,5], which has the properties of high power density and high energy-conversion efficiency. In order to improve utilization efficiency, much effort has been devoted to developing new synthetic methods to obtain Pt-based nanomaterials with composition and structure designed to achieve enhanced performances [6,7,8,9,10,11,12]. Obtained by a two-step bromide-induced galvanic replacement at high temperature [27], and mesoporous platinum nanospheres are synthesized by using a templated route [28]. These approaches require complicated synthetic procedures, so they are very difficult to scale up. We propose a one-step method for the efficient synthesis of bimetallic porous AuPt nanoparticles (PAuPt NPs). The proposed synthetic approach is promising to afford a general strategy for synthesis of interesting bimetallic nanocatalysts by adjusting precursor species
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