Surface reaction studies of water and oxygen with polycrystalline Ni3Fe: Evidence of water dissociation to produce hydrogen and its suppression by oxygen coadsorption

被引：7
作者：
Chia, WJ
Chung, YW
机构：
[1] Dept. of Mat. Sci. and Engineering, Robert R. McCormick Sch. Eng. A., Northwestern University, Evanston
来源：
INTERMETALLICS | 1996年 / 4卷 / 04期
基金：
美国国家科学基金会;
关键词：
model systems; environmental embrittlement; hydrogen embrittlements;
D O I：
10.1016/0966-9795(95)00049-6
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 interaction of water vapor and oxygen with polycrystalline Ni3Fe has been studied by Auger electron spectroscopy, X-ray photoelectron spectroscopy (XPS) and thermal desorption. Water adsorbs molecularly on the surface at or below 150 K. Between 150 and 200 K, some adsorbed water molecules desorb in vacuum, while others dissociate into hydroxyls, atomic oxygen, and hydrogen. XPS studies suggest iron to be the active species in controlling the dissociation of water on polycrystalline Ni,Fe surface. Water dissociation into atomic hydrogen is greatly suppressed by the presence of small concentrations of oxygen in water vapor. (C) 1996 Elsevier Science Ltd.
引用
收藏
页码：283 / 288
页数：6
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