Improving the Ethanol Oxidation Activity of Pt-Mn Alloys through the Use of Additives during Deposition
AbstractIn this work, sodium citrate (SC) was used as an additive to control the particle size and dispersion of Pt-Mn alloy nanoparticles deposited on a carbon support. SC was chosen, since it was the only additive tested that did not prevent Mn from co-depositing with Pt. The influence of solution pH during deposition and post-deposition heat treatment on the physical and electrochemical properties of the Pt-Mn alloy was examined. It was determined that careful control over pH is required, since above a pH of four, metal deposition was suppressed. Below pH 4, the presence of sodium citrate reduced the particle size and improved the particle dispersion. This also resulted in larger electrochemically-active surface areas and greater activity towards the ethanol oxidation reaction (EOR). Heat treatment of catalysts prepared using the SC additive led to a significant enhancement in EOR activity, eclipsing the highest activity of our best Pt-Mn/C prepared in the absence of SC. XRD studies verified the formation of the Pt-Mn intermetallic phase upon heat treatment. Furthermore, transmission electron microscopy studies revealed that catalysts prepared using the SC additive were more resistant to particle size growth during heat treatment. View Full-Text
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Ghavidel, M.Z.; Easton, E.B. Improving the Ethanol Oxidation Activity of Pt-Mn Alloys through the Use of Additives during Deposition. Catalysts 2015, 5, 1016-1033.
Ghavidel MZ, Easton EB. Improving the Ethanol Oxidation Activity of Pt-Mn Alloys through the Use of Additives during Deposition. Catalysts. 2015; 5(3):1016-1033.Chicago/Turabian Style
Ghavidel, Mohammadreza Z.; Easton, E. B. 2015. "Improving the Ethanol Oxidation Activity of Pt-Mn Alloys through the Use of Additives during Deposition." Catalysts 5, no. 3: 1016-1033.