ELECTROMODULATED INFRARED-SPECTROSCOPY OF METHANOL ELECTROOXIDATION ON ELECTRODISPERSED PLATINUM-ELECTRODES - ENHANCEMENT OF REACTIVE INTERMEDIATES

被引：49

作者：

BEDEN, B ^{[1
]}

HAHN, F ^{[1
]}

LEGER, JM ^{[1
]}

LAMY, C ^{[1
]}

PERDRIEL, CL ^{[1
]}

DETACCONI, NR ^{[1
]}

LEZNA, RO ^{[1
]}

ARVIA, AJ ^{[1
]}

机构：

[1] NATL UNIV LA PLATA,FAC CIENCIAS EXACTAS,INST INVEST FISICOQUIM TEORICAS & APLICADAS,RA-1900 LA PLATA,ARGENTINA

来源：

JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 1991年 / 301卷 / 1-2期

关键词：

D O I：

10.1016/0022-0728(91)85464-Z

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

EMIRS spectra of the surface species resulting from methanol electrosorption on electrodispersed Pt were obtained by working under a wide range of experimental conditions, i.e. electrode roughness factor, methanol concentration and mean modulation potential. The intensity of the absorption band related to linearly adsorbed CO-species, CO(L), at ca. 2030-2080 cm-1 decreases on increasing the electrode roughness factor, a fact which is interpreted as a decrease in the CO adsorbate poisoning effect on electrodispersed Pt surfaces. As a consequence, under well-defined conditions, several bands are observed which might be assigned to adsorbed intermediates and reactive species. EMIRS also reveals a competition between CO(B) and CO(L) at high surface coverages. Spectral data for methanol electrooxidation on electrodispersed electrodes correlate well with the expected structure of this type of electrode.

引用

页码：129 / 138

页数：10

共 28 条

[1] INFRARED SPECTROSCOPIC STUDY OF THE METHANOL ADSORBATES AT A PLATINUM-ELECTRODE .1. INFLUENCE OF THE BULK CONCENTRATION OF METHANOL UPON THE NATURE OF THE ADSORBATES [J].