Adsorption sites and ligand effect for CO on an alloy surface: a direct view

被引：114

作者：

Gauthier, Y

Schmid, M

Padovani, S

Lundgren, E

Bus, V

Kresse, G

Redinger, J

Varga, P

机构：

[1] Vienna Tech Univ, Inst Allgemeine Phys, A-1040 Vienna, Austria

[2] CNRS, Cristallog Lab, F-38042 Grenoble 09, France

[3] Brno Univ Technol, Inst Engn Phys, CZ-61669 Brno, Czech Republic

[4] Univ Vienna, Inst Mat Phys, A-1090 Vienna, Austria

[5] Tech Univ Vienna, Ctr Computat Mat Sci, A-1090 Vienna, Austria

来源：

PHYSICAL REVIEW LETTERS | 2001年 / 87卷 / 03期

关键词：

D O I：

10.1103/PhysRevLett.87.036103

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

CO adsorption on a PtCo(111) surface was studied by scanning tunneling microscopy. Comparison of images with chemical contrast of Pt and Co and images. showing the CO molecules indicates that CO resides exclusively on top of Pt sites and never on Co. CO bonding is highly sensitive to the chemical environment. The probability to find CO on a Pt atom increases drastically with the number of its Co nearest neighbors. Ab initio calculations show that this ligand effect is due to different positions of the center of the Pt d band.

引用

页码：36103 / 1

页数：4

共 30 条

[1] Surface stress and chemical reactivity of Pt and Pd overlayers
Bertolini, JC
[J]. APPLIED CATALYSIS A-GENERAL, 2000, 191 (1-2) : 15 - 21
[2] PROJECTOR AUGMENTED-WAVE METHOD
BLOCHL, PE
[J]. PHYSICAL REVIEW B, 1994, 50 (24): : 17953 - 17979
[3] CO adsorption and oxidation on bimetallic Pt/Ru(0001) surfaces - a combined STM and TPD/TPR study
de Mongeot, FB
Scherer, M
Gleich, B
Kopatzki, E
Behm, RJ
[J]. SURFACE SCIENCE, 1998, 411 (03) : 249 - 262
[4] The CO/Pt(111) puzzle
Feibelman, PJ
Hammer, B
Norskov, JK
Wagner, F
Scheffler, M
Stumpf, R
Watwe, R
Dumesic, J
[J]. JOURNAL OF PHYSICAL CHEMISTRY B, 2001, 105 (18) : 4018 - 4025
[5] THE KINETICS OF THE ADSORPTION AND DESORPTION OF THE SYSTEM CO/PT(111) DERIVED FROM HIGH-RESOLUTION TREELS
FROITZHEIM, H
SCHULZE, M
[J]. SURFACE SCIENCE, 1989, 211 (1-3) : 837 - 843
[6] Segregation and chemical ordering in the surface layers of Pt25Co75(111):: a LEED/STM study
Gauthier, Y
Baudoing-Savois, R
Bugnard, JM
Hebenstreit, W
Schmid, M
Varga, P
[J]. SURFACE SCIENCE, 2000, 466 (1-3) : 155 - 166
[7] Correlation between local substrate structure and local chemical properties: CO adsorption on well-defined bimetallic Au/Pd(111) surfaces
Gleich, B
Ruff, M
Behm, RJ
[J]. SURFACE SCIENCE, 1997, 386 (1-3) : 48 - 55
[8] Improved adsorption energetics within density-functional theory using revised Perdew-Burke-Ernzerhof functionals
Hammer, B
Hansen, LB
Norskov, JK
[J]. PHYSICAL REVIEW B, 1999, 59 (11) : 7413 - 7421
[9] Hammer B, 2000, ADV CATAL, V45, P71
[10] ADSORPTION OF CO ON PT(111) AND PT 6(111) X (111) STUDIED BY HIGH-RESOLUTION ELECTRON-ENERGY LOSS SPECTROSCOPY AND THERMAL DESORPTION SPECTROSCOPY
HOPSTER, H
IBACH, H
[J]. SURFACE SCIENCE, 1978, 77 (01) : 109 - 117

← 1 2 3 →