Local and nonlocal functions of Cs promoter in the O2-oxidation of graphite

被引：11

作者：

Hahn, JR ^{[1
]}

Kang, H ^{[1
]}

机构：

[1] Seoul Natl Univ, Sch Chem, Kwanak Ku, Seoul 151742, South Korea

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2002年 / 106卷 / 30期

关键词：

D O I：

10.1021/jp020725k

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 o(2) oxidation reaction of graphite was studied by preparing Cs promoters in two different states: Cs adsorbed on a surface [Cs(ad)] and Cs trapped underneath a surface carbon plane [Cs(tr)]. Reactive ion scattering spectrometry (RIS) and, scanning tunneling microscopy (STM) were used to identify the reaction intermediates and to measure the spatial range of the Cs promoter effect. Cs(ad) promotes the oxidation reaction in a localized region through formation of CsO and CsO2 intermediates. On the other hand, Cs(tr) promotes the reaction over a long range, such that a large number (similar to10(3)) of O-2 molecules are chemisorbed at a graphite surface and etch away the surface carbons.

引用

页码：7445 / 7448

页数：4

共 29 条

[1] ON THE OXYGEN INDUCED STABILIZATION OF ADSORBED ALKALI ATOMS [J].

ALBANO, EV .

SURFACE SCIENCE, 1989, 215 (03) :333-347

[2]

[Anonymous], SURFACE SCI REPT

[3]

Bonzel H.P., 1989, MAT SCI MONOGRAPHS, V57

[4] THE INTERACTION OF POTASSIUM WITH OXYGEN ON GRAPHITE AS STUDIED BY HIGH-RESOLUTION ELECTRON-ENERGY-LOSS SPECTROSCOPY AND THERMAL-DESORPTION SPECTROSCOPY [J].

CHAKAROV, DV ;

SJOVALL, P ;

KASEMO, B .

JOURNAL OF PHYSICS-CONDENSED MATTER, 1993, 5 (18) :2903-2912

[5] EFFECT OF SCREENING ON THE CARBON KVV AUGER LINE-SHAPE OF ALKALI-METAL - INTERCALATED GRAPHITE [J].

DUNLAP, BI ;

RAMAKER, DE ;

MURDAY, JS .

PHYSICAL REVIEW B, 1982, 25 (10) :6439-6446

[6] Catalytic oxidation of the GaAs(110) surface promoted by a Cs overlayer [J].

Faraci, G ;

Pennisi, AR ;

Margaritondo, G .

PHYSICAL REVIEW B, 1996, 53 (20) :13851-13856

[7] MODIFICATION OF TRANSITION-METAL ELECTRONIC-STRUCTURE BY P, S, CL, AND LI ADATOMS [J].

FEIBELMAN, PJ ;

HAMANN, DR .

SURFACE SCIENCE, 1985, 149 (01) :48-66

[8] The role of adsorbed alkali metal atoms in the enhancement of surface reactivity: A scanning tunneling microscopy study of low coverage K/Si(111)7x7 surfaces [J].

Gorelik, D ;

Aloni, S ;

Eitle, J ;

Meyler, D ;

Haase, G .

JOURNAL OF CHEMICAL PHYSICS, 1998, 108 (23) :9877-9884

[9] Observation of charge enhancement induced by graphite atomic vacancy: A comparative STM and AFM study [J].

Hahn, JR ;

Kang, H ;

Song, S ;

Jeon, IC .

PHYSICAL REVIEW B, 1996, 53 (04) :R1725-R1728

[10] Promoted graphite oxidation in the presence of Cs trapped between basal planes [J].

Hahn, JR .

SURFACE SCIENCE, 1999, 423 (01) :L216-L221

← 1 2 3 →