The Open UniversitySkip to content
 

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.

URL: http://www.rsc.org/Publishing/Journals/CP/index.as...
DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1039/b401641f
Google Scholar: Look up in Google Scholar

Abstract

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: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
eSTEeM
Biomedical Research Network (BRN)
Item ID: 6099
Depositing User: Astrid Peterkin
Date Deposited: 22 Dec 2006
Last Modified: 07 Mar 2014 13:42
URI: http://oro.open.ac.uk/id/eprint/6099
Share this page:

Actions (login may be required)

View Item
Report issue / request change

Policies | Disclaimer

© The Open University   + 44 (0)870 333 4340   general-enquiries@open.ac.uk