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Electrocatalytic activity under oscillatory regime: The electro-oxidation of formic acid on ordered Pt3Sn intermetallic phase

Paper ID Volume ID Publish Year Pages File Format Full-Text
51145 46832 2013 4 PDF Available
Title
Electrocatalytic activity under oscillatory regime: The electro-oxidation of formic acid on ordered Pt3Sn intermetallic phase
Abstract

Despite the considerable progress in the understanding of the mechanistic aspects of the oscillatory electro-oxidation of C1 molecules, there are apparently no systematic studies concerning the impact of surface modifiers on the oscillation dynamics. Herein we communicate on the oscillatory electro-oxidation of formic acid on ordered Pt3Sn intermetallic phase, and compare the results with those obtained on a polycrystalline platinum electrode. Overall, the obtained results were very reproducible, robust and allowed a detailed analysis on the correlation between the catalytic activity and the oscillation dynamics. The presence of Sn in the intermetallic electrode promotes drastic effects on the oscillatory dynamics. The decrease in the mean electrode potential and in the oscillation frequency, as well as the pronounced increase in the number oscillations (and also in the oscillation time), was discussed in connection with the substantial catalytic enhancement of the Pt3Sn towards the electro-oxidation of formic acid. The self-organized potential oscillations were used to probe the electrocatalytic activity of the Pt3Sn electrode and compare it with that for polycrystalline Pt. The presence of Sn resulted in a significant decrease (2–11 times, depending on the applied current) of the rate of surface poisoning.

► Oscillatory electro-oxidation of formic acid on ordered Pt3Sn intermetallic phase. ► Very reproducible and robust results. ► Detailed analysis of the correlation between the catalytic activity and the oscillation dynamics. ► Drastic changes of the oscillation features induced by the presence of tin. ► Under oscillatory regime, the presence of Sn decreased significantly the rate of surface poisoning.

Keywords
Formic acid; Intermetallic phase; Platinum–tin; Electrocatalysis; Oscillations
First Page Preview
Electrocatalytic activity under oscillatory regime: The electro-oxidation of formic acid on ordered Pt3Sn intermetallic phase
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 30, 5 January 2013, Pages 23–26
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis