Characterization and electrocatalytic properties of PtRu/C catalysts prepared by impregnation-reduction method using Nd2O3 as dispersing reagent |
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Authors: | Ling Chen |
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Affiliation: | Department of Physical Chemistry, University of Science and Technology Beijing, No. 30 College Road, Beijing 100083, China |
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Abstract: | A simple impregnation-reduction method introducing Nd2O3 as dispersing reagent has been used to synthesize PtRu/C catalysts with uniform Pt-Ru spherical nanoparticles. X-ray diffraction (XRD) analysis, transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) analysis have been used to characterize the composition, particle size and crystallinity of the catalysts. Well-dispersed catalysts with average particle size about 2 nm are achieved. The electrochemically active surface area of the different PtRu/C catalysts is determined by the COad-stripping voltammetry experiment. The electrocatalytic activities of these catalysts towards methanol electrooxidation are investigated by cyclic voltammetry measurements and ac impedance spectroscopy. The in-house prepared PtRu/C catalyst (PtRu/C-03) in 0.5 M H2SO4 + 1.0 M CH3OH at 30 °C display a higher catalytic activity and lower charge-transfer resistance (Rt) than that of the standard PtRu/C catalyst (PtRu/C-C). It is mainly due to enhanced electrochemically active specific surface, higher alloying extent of Ru and the abundant Pt0 and Ru oxides on the surface of the PtRu/C catalyst. |
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Keywords: | Direct methanol fuel cell PtRu/C catalyst Impregnation-reduction method Methanol electrooxidation Rare earth |
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