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Se/Ru–Au Nanocomposites Provide Enhanced-Electroactivity in Direct Methanol Fuel Cells

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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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Keywords: BIMETALLIC CATALYSTS; ELECTROCHEMICAL OXYGEN REDUCTION; SE/RU–AU NANOCOMPOSITES

Document Type: Research Article

Publication date: November 1, 2013

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  • Science of Advanced Materials (SAM) is an interdisciplinary peer-reviewed journal consolidating research activities in all aspects of advanced materials in the fields of science, engineering and medicine into a single and unique reference source. SAM provides the means for materials scientists, chemists, physicists, biologists, engineers, ceramicists, metallurgists, theoreticians and technocrats to publish original research articles as reviews with author's photo and short biography, full research articles and communications of important new scientific and technological findings, encompassing the fundamental and applied research in all latest aspects of advanced materials.
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