Heterogeneously assisted oxidation of adsorbates from carbonmonoxide, methanol and ethanol by hydrogen peroxide solutions on platinum electrodes in sulphuric acid

被引：6

作者：

Rodriguez, J. L.

Pastor, E.

Zinola, C. F.

Schmidt, V. M. ^{[1
]}

机构：

[1] Hsch Mannheim, Inst Elektrochem Verfahrenstech, D-68163 Mannheim, Germany

[2] Univ La Laguna, Dept Quim Fis, Tenerife 38071, Spain

[3] Univ Republica, Fac Ciencias, Lab Electroquim Fundamental, Montevideo 11400, Uruguay

来源：

JOURNAL OF APPLIED ELECTROCHEMISTRY | 2006年 / 36卷 / 11期

关键词：

carbon monoxide; ethanol; hydrogen peroxide; methanol; on-line mass spectrometry;

D O I：

10.1007/s10800-006-9178-z

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The influence of hydrogen peroxide on the adsorption and oxidation of carbon monoxide, methanol and ethanol adlayers on porous Pt electrodes were studied in 2 M sulphuric acid solution by means of cyclic voltammetry and differential electrochemical mass spectrometry (DEMS). The oxidation of adsorbed species is observed at electrode potentials far less negative than those required for electrochemical adsorbate oxidation. The oxidation by H2O2 is dependent on its concentration in solution, as well as on the adsorbates and their coverages. In all cases the isolated adlayers are oxidised by dissolved H2O2. However, the presence of H2O2 during adsorption partially inhibits adlayer formation from CH3OH and C2H5OH, but avoids almost completely the adsorption of carbon monoxide. The removal of the residues from the surface by dissolved hydrogen peroxide probably occurs through O-ad species formed during the heterogeneous decomposition reaction of H2O2 on Pt.

引用

页码：1271 / 1279

页数：9

共 13 条

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E. Pastor
C.F. Zinola
V.M. Schmidt
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