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Effect of Ru surface composition on the CO tolerance of Ru modified carbon supported Pt catalysts

Crabb, E.M.; Ravikumar, M.K.; Thompsett, D.; Hurford, M.; Rose, A. and Russell, A.E. (2004). Effect of Ru surface composition on the CO tolerance of Ru modified carbon supported Pt catalysts. Physical Chemistry Chemical Physics, 6(8) pp. 1792–1798.

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A series of ruthenium modified carbon supported catalysts have been prepared by surface organometallic chemistry (SOMC) with the following nominal RuPt surface ratios, (14)RuPt/C, (12)RuPt/C, (34)RuPt/C and (11)RuPt/C. The catalysts were characterised using X-ray diffraction (XRD), extended X-ray absorption fine structure (EXAFS), cyclic voltammetry (CV), and half-cell polarisation studies. The XRD measurements showed that a bulk PtRu alloy was not formed following SOMC modification. However, the EXAFS measurements indicated that a surface alloy is formed upon electrochemical reduction of the Ru modified catalysts. The CV studies show that the electrooxidation of CO on the Ru modified Pt/C catalysts occurs at lower potentials than on the unmodified Pt/C catalysts, but at higher potentials than on an alloyed PtRu/C with a bulk composition of 11 PtRu. Half cell polarisation measurements in 100 ppm CO in H2 show that the CO tolerance of the SOMC RuPt/C catalysts approached that of the conventional PtRu/C alloy catalyst. The results therefore indicate that a bulk alloy phase is not an essential factor in the improvement in CO tolerance of PtRu/C catalysts over that of Pt/C.

Item Type: Journal Article
ISSN: 1463-9076
Keywords: Absorption Fine-Structure; Fuel-Cell Catalysts; Pt-Ru; Organometallic Chemistry; Underpotential Deposition; Methanol Electrooxidation; Modified Pt(111); Adsorbed Co; Oxidation; Ruthenium
Academic Unit/Department: Science > Life, Health and Chemical Sciences
Interdisciplinary Research Centre: Biomedical Research Network (BRN)
Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 6099
Depositing User: Astrid Peterkin
Date Deposited: 22 Dec 2006
Last Modified: 24 Nov 2014 11:31
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