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Catalysts 2015, 5(3), 1016-1033; doi:10.3390/catal5031016

Improving the Ethanol Oxidation Activity of Pt-Mn Alloys through the Use of Additives during Deposition

Faculty of Science, University of Ontario Institute of Technology, 2000 Simcoe Street North, Oshawa, ON L1H 7K4, Canada
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Academic Editor: Minhua Shao
Received: 15 May 2015 / Revised: 11 June 2015 / Accepted: 16 June 2015 / Published: 25 June 2015
(This article belongs to the Special Issue Electrocatalysis in Fuel Cells)
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Abstract

In 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
Keywords: Pt-Mn alloy; additive; heat treatment; ethanol oxidation; catalysts; PEM fuel cell; direct alcohol fuel cell Pt-Mn alloy; additive; heat treatment; ethanol oxidation; catalysts; PEM fuel cell; direct alcohol fuel cell
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

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.

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