Poisoning the catalytic reduction of peroxide on Pb underpotential deposition modified Au surfaces with iodine

被引：25

作者：

Hsieh, SJ ^{[1
]}

Gewirth, AA ^{[1
]}

机构：

[1] Univ Illinois, Frederick Seitz Mat Res Lab, Dept Chem, Urbana, IL 61080 USA

来源：

SURFACE SCIENCE | 2002年 / 498卷 / 1-2期

基金：

美国国家科学基金会;

关键词：

electrochemical methods; scanning tunneling microscopy; catalysis; surface structure; morphology; roughness; and; topography; iodine; lead; single crystal surfaces; solid-liquid interfaces;

D O I：

10.1016/S0039-6028(01)01673-9

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：

The electrocatalysis of peroxide reduction by Pb underpotential deposition on Au(1 1 1) was studied through poisoning of the active surface by I. The addition of I- decreases the catalytic peroxide reduction activity; this decrease was fit with a Langmuir-type isotherm yielding a Gibbs free energy of adsorption of -43 kJ/mol. Analysis of STM images suggests that the active site for peroxide reduction is at the edge of the circular Pb islands as the reduction in island circumference scales with the reduction in catalytic activity as I- is added. At high-I concentrations, oblong PbI2 islands are observed throughout potentials where a smooth Pb monolayer was present in the system absent I-. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：147 / 160

页数：14

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