Catalysis of ethanol electrooxidation by PtRu: the influence of catalyst composition

The catalytic activity for ethanol oxidation is studied as a function of the atomic composition of PtRu electrodeposits. Chronoamperometric curves taken at 0.5 V show that the current for ethanol oxidation at PtRu electrodeposits, measured 30 min after the application of a potential step from 0.05 V...

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Bibliographic Details
Published in:Electrochemistry communications 2004-08, Vol.6 (8), p.812-815
Main Authors: Camara, G.A, de Lima, R.B, Iwasita, T
Format: Article
Language:English
Subjects:
Chemistry
Electrocatalysis
Electrochemistry
Ethanol electrooxidation
Exact sciences and technology
FTIR
Fuel cell
General and physical chemistry
Kinetics and mechanism of reactions
PtRu electrodeposits
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Summary:The catalytic activity for ethanol oxidation is studied as a function of the atomic composition of PtRu electrodeposits. Chronoamperometric curves taken at 0.5 V show that the current for ethanol oxidation at PtRu electrodeposits, measured 30 min after the application of a potential step from 0.05 V, increases in the presence of Ru up to a Ru content of about 40%. The highest value observed at 0.5 V vs. RHE was 30 μA/cm 2 at 25 °C. There is a relatively narrow range of PtRu compositions that present a high rate of ethanol oxidation. Pure Ru has no activity towards ethanol oxidation at room temperature.
ISSN:1388-2481
1873-1902
DOI:10.1016/j.elecom.2004.06.001