TY - JOUR
T1 - Methanol electrochemical oxidation at nanometer-scale PtRu materials
AU - Korzeniewski, Carol
AU - Basnayake, Rukma
AU - Vijayaraghavan, Ganesh
AU - Li, Zhengrong
AU - Xu, Shanhong
AU - Casadonte, Dominick J.
N1 - Funding Information:
Support for this work from the National Science Foundation (CHE-0203116) and the office of Naval Research is gratefully acknowledged.
PY - 2004/12/1
Y1 - 2004/12/1
N2 - The electrochemical oxidation of CH3OH at nanometer-scale PtRu catalyst materials is reported. Comparisons are made between the properties of a Johnson Matthey (JM) PtRu black sample (50 at.% Ru (XRu ≈ 0.5)) and PtRu particles (2-6 nm, nominally XRu ≈ 0.5) prepared by sonication under anhydrous conditions. Cyclic voltammetry and in situ infrared spectroscopy measurements show the catalysts are active for the oxidation, of 0.5 M CH3OH in 0.1 M HClO4 at temperatures between ambient and 70°C. The sonochemically prepared PtRu sample displayed properties characteristic of bulk PtRu alloys with XRu ≈ 0.5. Evidence for phase separation of Pt and Ru was observed in CO stripping voltammetry from the JM catalyst adsorbed at low metal loadings (20 μg/cm2) on bulk Au electrodes. Per gram of catalyst, the JM material was more active toward CO 2 formation and displayed greater resistance to poisoning by adsorbed CO than the sonochemically prepared material during ambient temperature oxidation of 0.5 M CH3OH in 0.1 M HClO4.
AB - The electrochemical oxidation of CH3OH at nanometer-scale PtRu catalyst materials is reported. Comparisons are made between the properties of a Johnson Matthey (JM) PtRu black sample (50 at.% Ru (XRu ≈ 0.5)) and PtRu particles (2-6 nm, nominally XRu ≈ 0.5) prepared by sonication under anhydrous conditions. Cyclic voltammetry and in situ infrared spectroscopy measurements show the catalysts are active for the oxidation, of 0.5 M CH3OH in 0.1 M HClO4 at temperatures between ambient and 70°C. The sonochemically prepared PtRu sample displayed properties characteristic of bulk PtRu alloys with XRu ≈ 0.5. Evidence for phase separation of Pt and Ru was observed in CO stripping voltammetry from the JM catalyst adsorbed at low metal loadings (20 μg/cm2) on bulk Au electrodes. Per gram of catalyst, the JM material was more active toward CO 2 formation and displayed greater resistance to poisoning by adsorbed CO than the sonochemically prepared material during ambient temperature oxidation of 0.5 M CH3OH in 0.1 M HClO4.
KW - Alcohols
KW - Catalysis
KW - Electrochemical methods
KW - Oxidation
UR - http://www.scopus.com/inward/record.url?scp=9944253716&partnerID=8YFLogxK
U2 - 10.1016/j.susc.2004.07.018
DO - 10.1016/j.susc.2004.07.018
M3 - Conference article
AN - SCOPUS:9944253716
SN - 0039-6028
VL - 573
SP - 100
EP - 108
JO - Surface Science
JF - Surface Science
IS - 1
T2 - Proceedings of the 9th International Fischer Symposium
Y2 - 21 July 2003 through 23 July 2003
ER -