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

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