Methanol Oxidation on PtRu Electrodes. Influence of Surface Structure and Pt−Ru Atom Distribution

The activities of different types of PtRu catalysts for methanol oxidation are compared. Materials used were:  UHV-cleaned PtRu alloys, UHV-evaporated Ru onto Pt(111) as well as adsorbed Ru on Pt(111) prepared with and without additional reduction by hydrogen. Differences in the catalytic activity a...

Full description

Saved in:
Bibliographic Details
Published in:Langmuir 2000-01, Vol.16 (2), p.522-529
Main Authors: Iwasita, T, Hoster, H, John-Anacker, A, Lin, W. F, Vielstich, W
Format: Article
Language:English
Subjects:
30 DIRECT ENERGY CONVERSION
ALCOHOL FUEL CELLS
CATALYTIC EFFECTS
CHEMICAL PREPARATION
ELECTROCATALYSTS
METHANOL
OXIDATION
PLATINUM
RUTHENIUM
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The activities of different types of PtRu catalysts for methanol oxidation are compared. Materials used were:  UHV-cleaned PtRu alloys, UHV-evaporated Ru onto Pt(111) as well as adsorbed Ru on Pt(111) prepared with and without additional reduction by hydrogen. Differences in the catalytic activity are observed to depend on the preparation procedure of the catalysts. The dependence of the respective catalytic activities upon the surface composition is reported. UHV−STM data for Pt(111)/Ru show the formation of two- and three-dimensional structures depending on surface coverage. A molecular insight on the electrochemical reaction is given via in situ infrared spectroscopy. Analysis of the data indicates that the most probable rate-determining step is the reaction of adsorbed CO with Ru oxide.
ISSN:0743-7463
1520-5827
DOI:10.1021/la990594n