Electrocatalytic activity of Ru-modified Pt(111) electrodes toward CO oxidation

被引：219

作者：

Lin, WF

Zei, MS

Eiswirth, M

Ertl, G

Iwasita, T

Vielstich, W

机构：

[1] Max Planck Gesell, Fritz Haber Inst, D-14195 Berlin, Germany

[2] Univ Bundeswehr Munchen, Inst Phys, D-85579 Neubiberg, Germany

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 1999年 / 103卷 / 33期

关键词：

D O I：

10.1021/jp9910901

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The electrochemical deposition of Ru on Pt(111) electrodes has been investigated by electron diffraction, Auger spectroscopy, and cyclic voltammetry in a closed UHV transfer system. At small coverages Ru formed a monatomic commensurate layer, at higher coverage mostly small islands with a bilayer height were detected. When the Pt was almost completely covered by Ru, three-dimensional clusters developed. The island structure of Ru changed upon electrooxidation of CO, reflecting an enhanced mobility of Ru. Adsorption and electrooxidation of CO have been studied on such Ru-modified Pt(111) electrodes using cyclic voltammetry and in situ FTIR spectroscopy. Compared to the pure metals, the Ru-CO bond is weakened, the Pt-CO bond strengthened on the modified electrodes. The catalytic activity of the Ru/Pt(111) electrode toward CO adlayer oxidation is higher than that of pure Ru and a PtRu alloy (50:50). It is concluded that the electrooxidation of CO takes place preferentially at the Ru islands, while CO adsorbed on Pt migrates to them.

引用

页码：6968 / 6977

页数：10

共 48 条

[1] First-principles study of CO bonding to Pt(111): validity of the Blyholder model
Aizawa, H
Tsuneyuki, S
[J]. SURFACE SCIENCE, 1998, 399 (2-3) : L364 - L370
[2] STRAIN RELIEF AT HEXAGONAL-CLOSE-PACKED INTERFACES
BRUNE, H
RODER, H
BORAGNO, C
KERN, K
[J]. PHYSICAL REVIEW B, 1994, 49 (04): : 2997 - 3000
[3] A MOLECULAR-BEAM STUDY OF THE CATALYTIC-OXIDATION OF CO ON A PT(111) SURFACE
CAMPBELL, CT
ERTL, G
KUIPERS, H
SEGNER, J
[J]. JOURNAL OF CHEMICAL PHYSICS, 1980, 73 (11) : 5862 - 5873
[4] Cappadonia M, 1996, ELEC SOC S, V96, P269
[5] Surface structure effects in platinum/ruthenium methanol oxidation electrocatalysis
Chrzanowski, W
Wieckowski, A
[J]. LANGMUIR, 1998, 14 (08) : 1967 - 1970
[6] Enhancement in methanol oxidation by spontaneously deposited ruthenium on low-index platinum electrodes
Chrzanowski, W
Kim, H
Wieckowski, A
[J]. CATALYSIS LETTERS, 1998, 50 (1-2) : 69 - 75
[7] Ultrathin films of ruthenium on low index platinum single crystal surfaces: An electrochemical study
Chrzanowski, W
Wieckowski, A
[J]. LANGMUIR, 1997, 13 (22) : 5974 - 5978
[8] STUDY OF THE CHARGE DISPLACEMENT AT CONSTANT POTENTIAL DURING CO ADSORPTION ON PT(110) AND PT(111) ELECTRODES IN CONTACT WITH A PERCHLORIC-ACID SOLUTION
CLAVILIER, J
ALBALAT, R
GOMEZ, R
ORTS, JM
FELIU, JM
ALDAZ, A
[J]. JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1992, 330 (1-2): : 489 - 497
[9] MECHANISMS OF FORMIC-ACID, METHANOL, AND CARBON-MONOXIDE ELECTROOXIDATION AT PLATINUM AS EXAMINED BY SINGLE POTENTIAL ALTERATION INFRARED-SPECTROSCOPY
CORRIGAN, DS
WEAVER, MJ
[J]. JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1988, 241 (1-2): : 143 - 162
[10] Surface structural and chemical characterization of Pt/Ru composite electrodes: A combined study by XPS, STM and IR spectroscopy
Cramm, S
Friedrich, KA
Geyzers, KP
Stimming, U
Vogel, R
[J]. FRESENIUS JOURNAL OF ANALYTICAL CHEMISTRY, 1997, 358 (1-2): : 189 - 192

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