Oxygen reduction and hydrogen oxidation reactions on Pt(111) and Pt(100) in solutions containing copper ions

被引：26

作者：

Stamenkovic, V ^{[1
]}

Markovic, NM ^{[1
]}

机构：

[1] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA

来源：

LANGMUIR | 2001年 / 17卷 / 08期

关键词：

D O I：

10.1021/la0014095

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The effects of underpotentially deposited copper (Cu-upd) On the kinetics of the oxygen reduction reaction (ORR) and the hydrogen oxidation reaction (HOR) have been studied at Pt(lll) and Pt(100) surfaces in 0.05 M H2SO4 containing either Cu2+ Or mixtures of Cu2+ and Cl- ions. The results show that Cu-upd has a strong inhibiting effect on both the ORR and the HOR. The deactivation is linked to an enhanced anion adsorption on platinum atoms adjacent to Cu-upd atoms. This mechanism explains the anomalously large inhibition by a very small amount of Cu-upd. The ORR on Cu-upd-modified electrodes proceeds mostly as a 4e(-) reaction pathway with negligible solution phase peroxide formation, ca. 3%. The physical model that appears to realize this result is one in which the active sites for the adsorption of molecular O-2 are a small number of platinum islands which are created when desorption of anions takes place from Cu-upd-unmodified platinum sites. The same sites are also active centers for the HOR.

引用

页码：2388 / 2394

页数：7

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