Se/Ru–Au Nanocomposites Provide Enhanced-Electroactivity in Direct Methanol Fuel Cells
We have used an impregnation method to prepare Se/Ru–Au nanocomposites from 100-nm Se/Ru core–shell nanoparticles (NPs) and Au NPs (diameters 14, 32, or 56 nm). Au NPs tend to be adsorbed onto Se/Ru core–shell NPs to form Se/Ru–Au nanocomposites. We conducted transmission electron microscopy, X-ray photoelectron spectroscopy, and inductively coupled plasma mass spectrometry to characterize these nanocomposites. Se/Ru–Au nanocomposites have been used to prepare active electrodes in direct methanol fuel cells (DMFCs). Using cyclic voltammetry, we determined mass activities of the bimetallic Se/Ru–Au14, Se/Ru–Au32, and Se/Ru–Au56 toward the oxygen reduction reaction to be 116.3, 73.0, and 87.7 A g–1, respectively, which are much higher than those of traditional RuxSey catalysts. Cyclic voltammetry measurements have further revealed that Se/Ru–Au14 electrodes remain highly active over at least 100 cycles. Owing to their ease of large-scale preparation, low cost, high electroactivity, and high stability, the Se/Ru–Au electrodes possess great potential for use in DMFCs.
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Document Type: Research Article
Publication date: November 1, 2013
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