The catalytic oxidation of carbon monoxide at the platinum/electrolyte interface investigated by optical second harmonic generation (SHG): comparison of Pt(111) and Pt(997) electrode surfaces

被引：35

作者：

Akemann, W

Friedrich, KA

Linke, U

Stimming, U

机构：

[1] Forschungszentrum Julich, Inst Energieverfahrenstech, D-52425 Julich, Germany

[2] Forschungszentrum Julich, Inst Grenzflachenforsch & Vakuumphys, D-52425 Julich, Germany

来源：

SURFACE SCIENCE | 1998年 / 402卷 / 1-3期

关键词：

carbon monoxide; electrochemical methods; molecule-solid reactions; oxidation; platinum; second harmonic generation; single crystal surfaces; solid-liquid interfaces; surface chemical reaction;

D O I：

10.1016/S0039-6028(97)01043-1

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 anodic oxidation of CO on nominal Pt(111) and Pt(997) electrodes in a CO-saturated 0.1 M HClO(4) electrolyte is studied by optical second harmonic generation (SHG) at a wavelength of 280 nm to monitor the CO adlayer under steady-slate reaction conditions in the potential range between 50 mV and 1030 mV vs. RHE. Regarding the catalytic activity of the electrodes, two potential regimes are distinguishable: in the low potential regime, characterized by the presence of a dense CO overlayer, the reaction yield is higher on Pt(997) than on Pt(111). Positive of the overlayer stripping potential [880 mV for Pt(111) and 780 mV for Pt(997)] the Pt(997) electrode exhibits an inferior reactivity. The results confirm the structure sensitivity of anodic CO oxidation on Pt electrode surfaces. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：571 / 575

页数：5

共 16 条

[1]

AKEMANN W, UNPUB J CHEM PHYS

[2] THE ELECTROOXIDATION OF CO-ADSORBATES ON DIFFERENT PLATINUM-ELECTRODES IN ACID-SOLUTION [J].