Abstract
The design of cost-efficient catalysts for the electrooxidation of liquid fuel is now highly desirable for the commercial application of direct alcohol fuel cells. In view of this, we herein reported a simple and one-pot chemical strategy for synthesis of PtAu@Pt nanodendrite on carbon support (PtAu@Pt/C) with Pt/Au core Pt shell heterostructures in amphiphilic triblock copolymer-water system. The preparation process is one-step, free of additives and stabilizers. The structure information and electrocatalytic activity of the prepared PtAu@Pt/C composites were widely analyzed by transmission electron microscopy (TEM), high resolution TEM (HRTEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and electrochemical measurements. The catalytic activity of bimetallic PtAu@Pt/C catalyst for methanol oxidation (MOR) is higher than that of commercially available Pt/C (JM), and the optimal Pt-to-Au ratio is 3:1, and the nanocatalyst of PtAu@Pt/C (3:1) possesses high stability and durability. The improvement of electrocatalytic activity may be attributed to the effective surface structure of Pt-modified PtAu nanoparticles, which have a higher utilization of Pt in the surface reaction for methanol electrooxidation.
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