Limiting the Amount of Oxides in Pt-Mn Alloy Catalysts for Ethanol Oxidation

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.

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

Ghavidel

Easton

2015

Catalysts

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Limiting the Amount of Oxides in Pt-Mn Alloy Catalysts for Ethanol Oxidation

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

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

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