Abstract
Ceria (CeO 2)-modified PtRu/C catalysts with different compositions of Ru and CeO 2, viz. PtRu 0.9(CeO 2) 0.1/C, PtRu 0.7(CeO 2) 0.3/C and PtRu 0.5(CeO 2) 0.5/C and unmodified PtRu/C catalyst were synthesized by the sodium borohydride reduction method. Transmission electron microscopic results indicated that the lower concentrated CeO 2-modified PtRu/C catalysts had almost a similar morphological structure (well-dispersed particles with size around 2.3–2.5 nm) with that of the unmodified PtRu/C catalyst. X-ray diffraction and X-ray photoelectron spectroscopy analyses indicated the formation of PtRu alloy and presence of CeO 2 in an amorphous form with a mixed oxidation states (Ce 3+–Ce 4+). Electro-catalytic activity of these catalysts for methanol oxidation was investigated by linear sweep voltammetry and chronoamperometry and it was found that the PtRu 0.7(CeO 2) 0.3/C catalyst yielded the higher methanol oxidation current than did the unmodified PtRu/C catalysts.
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