Abstract
Abstract An efficient, low-cost and general strategy is developed to deposit well-dispersed Pd nanoparticles on Fe 3 O 4 hollow nanospheres. In this route, Fe 3 O 4 hollow nanospheres pretreated with dilute HCl solution were firstly employed as supports and simple chemical reduction was then introduced. The morphology, structure and elemental composition of the as-obtained samples were characterized by transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), field emission scanning electron microscopy (FESEM), X-ray energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), nitrogen sorption and elemental analysis. Electrodes coated with the Pd/Fe 3 O 4 were studied for the oxidation of methanol in 0.1 M NaOH in half cells. The results show highly dispersed Pd nanoparticles are evenly immobilized on the surface of Fe 3 O 4 hollow nanospheres. The cyclic voltammetry tests reveal this novel composite possesses excellent electrocatalytic activity and long-term stability for methanol oxidation in alkaline media.
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