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The Role of a Sn Promoter on an Anodic Pt Electrocatalyst Prepared over H2O2‐Functionalized Carbon Supports for Direct Ethanol Fuel Cell (DEFC) Applications

Von Wiley-VCH zur Verfügung gestellt

H2O2 treatment caused substantial modifications in the carbon structures. Changes in the metal-support interaction led to improved electrochemical behavior. A clear promoter effect of Sn is observed in both functionalized carbons, which shifts the CO oxidation peak to lower potentials. The current intensity of PtSn/CNT-H2O2 catalyst is the highest of all prepared catalysts (380 mA mg Pt−1), followed by the other bimetallic catalyst supported on functionalized Vulcan carbon (296 mA mg Pt−1).


Multiwalled carbon nanotubes and Vulcan carbon were functionalized with a 30 %v/v hydrogen peroxide solution and employed as supports for Pt and PtSn catalysts prepared by the polyol method. PtSn catalysts with a Pt loading of 20 wt.% and a Pt : Sn atomic ratio equal to 3 : 1 were evaluated in the ethanol electrooxidation reaction. The effects of the oxidizing treatment on the surface area and the surface chemical nature were analyzed through N2 adsorption, isoelectric point, and temperature-programmed desorption measurements. Results showed that the H2O2 treatment affects the surface area of the carbons to a great extent. Characterization results indicated that the performance of the electrocatalysts strongly depends both on the presence of Sn and on the support functionalization. PtSn/CNT−H2O2 electrocatalyst displays a high electrochemical surface area and enhanced catalytic activity for ethanol oxidation in comparison to other catalysts in the present study.

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