Abstract
In this paper, we report a simple one-step thermal reducing method for synthesis of bimetallic [email protected] nanoparticles with core-shell structures on the graphene surface. This new type of [email protected]–G composites is characterized by transmission electron microscopy, high resolution transmission electron microscopy, X-ray photoelectron spectroscopy and X-ray diffraction. It is found that [email protected] nanoparticles with an average diameter of 11 nm are well dispersed on the graphene surface, and the Au core quantity as well as the Pd shell thickness can be quantitatively controlled by loading different amounts of metallic precursors, and the involved core-shell structure formation mechanism is also discussed. The ternary Pt/[email protected]–G composites can also be synthetized by the subsequent Pt doping. The catalytic performance of [email protected]–G composites toward methanol electro-oxidation in acidic media is investigated. The results show that [email protected]–G composites exhibit higher catalytic activity, better stability and stronger tolerance to CO poisoning than Pd–G and Au–G counterparts.
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