Abstract
Noble metal-based bimetallic alloy nanostructures became popular for methanol oxidation reaction (MOR) in order to lower the high cost of the Pt catalyst and improve the catalyst activity as well as their CO tolerance. Fabrication of the secondary structures of bimetallic alloy nanocrystal clusters is desired due to their abundant accessible active sites and enhanced stability. Herein, for the first time, we prepared novel Pt-Cu bimetallic alloy nanocrystal clusters (Pt-Cu BANCs) in the presence of poly(diallyldimethylammonium chloride) (PDDA). The selective use of PDDA and control of the amount of PDDA are critical to the controlled fabrication of secondary structures with nanograins assembled together. The Pt-Cu BANCs offered abundant active sites available and enhanced durable stability, and are investigated to be high-performance electrocatalysts for MOR (i.e. the ECSAs of Pt-Cu BANCs and the specific current density of methanol oxidation on Pt-Cu BANCs are 73.9 m2/g and 3.36 mA·cm-2, respectively), which are far better than those of commercial Pt/C and Pt black. Our results reported herein developed an effective strategy of polyelectrolyte-assisted soft reduced process for the creation of the secondary structures of bimetallic alloy nanocrystal clusters, which would be used as enhanced catalysts in the field of clean energy.
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