Author:
Santiago Elisabete I.,Batista Marcelo S.,Assaf Elisabete M.,Ticianelli Edson A.
Abstract
In this work, the mechanism of CO tolerance for the hydrogen oxidation reaction (HOR) was investigated on Mo-based carbon dispersed electrocatalysts (Mo/C and PtMo/C). Gas-diffusion electrodes with a diffusion layer formed by Mo/C and a catalyst layer composed by Pt/C, PtRu/C, or PtMo/C, showed enhanced electrocatalytic activity for the HOR in the presence of CO. This phenomenon was associated to a lowering of the CO concentration in the gas channel of the electrodes promoted by a water gas shift (WGS) reaction taking place in the Mo/C layer. The occurrence of this reaction was confirmed by gas chromatographic analyses of the CO content, conducted at the outlet of a Mo/C reactor operating at 100°C and fed with different
H
2
O
/
H
2
/
CO
/
CO
2
mixtures. Experiments made in the presence of
CO
2
indicated an additional CO poisoning effect due to the reversing of the WGS reaction, but the Mo-based electrodes still showed a performance superior to that of the standard state-of-the-art PtRu/C. © 2004 The Electrochemical Society. All rights reserved.
Publisher
The Electrochemical Society
Subject
Materials Chemistry,Electrochemistry,Surfaces, Coatings and Films,Condensed Matter Physics,Renewable Energy, Sustainability and the Environment,Electronic, Optical and Magnetic Materials
Cited by
63 articles.
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