FIELD-INDUCED OXYGEN LAYER FORMATION FROM H2O AND ITS TITRATION BY HYDROGEN ON A PT-EMITTER

被引：13

作者：

GORODETSKII, V

ERNST, N

DRACHSEL, W

BLOCK, JH

机构：

[1] MAX PLANCK GESELL,FRITZ HABER INST,D-14195 BERLIN,GERMANY

[2] NOVOSIBIRSK CATALYSIS INST,NOVOSIBIRSK 630090,RUSSIA

来源：

APPLIED SURFACE SCIENCE | 1995年 / 87-8卷 / 1-4期

关键词：

D O I：

10.1016/0169-4332(94)00488-9

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：

FEM and FIM studies are presented showing the field-induced formation of an O-ads island on the apex of a platinum field emitter. This occurs during the well known bimolecular, field-induced water dissociation reaction 2H(2)O(ads) --> H3Ogas+ + gas OHads + e((Pt))(-) which is followed by a disproportionation reaction of the OHads species to H2O and O-ads without any noticeable face specifity. The titration reaction of the O-ads layer with H-2 displays face specific conversion rates. FIM reveals chemical waves propagating with sharp boundaries on the atomic scale. Implications for the oscillating H2O/H-2 reaction system are discussed.

引用

页码：151 / 158

页数：8

共 23 条

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BECKEY HD, 1973, FIELD IONIZATION MAS

[2]

BLOCK JH, 1975, METHODS PHENOMENA, V1, P379

[3]

BLOCK JH, 1991, SURF SCI, V246, P12

[4] MASS SEPARATION OF IMAGE GAS-FIELD IONS IN THE FIELD-ION MICROSCOPE [J].