H2O2 determination at iron-rich clay modified electrodes

被引：20

作者：

Charradi, Khaled ^{[1
,2
]}

Gondran, Chantal ^{[1
]}

Amara, Abdesslem Ben Haj

Prevot, Vanessa ^{[2
]}

Mousty, Christine ^{[2
]}

机构：

[1] Univ Grenoble 1, Dept Chim Mol, CNRS, UMR 5250, F-38041 Grenoble 9, France

[2] Univ Blaise Pascal, Lab Mat Inorgan, CNRS, UMR 6002, F-63177 Aubiere, France

来源：

ELECTROCHIMICA ACTA | 2009年 / 54卷 / 17期

关键词：

Clay modified electrode; Hydrogen peroxide; Hemoglobin; Methyl viologen; Structural iron; Amperometric sensors; DIRECT ELECTROCHEMISTRY; HYDROGEN-PEROXIDE; HEMOGLOBIN; FILMS; BIOSENSOR; CATALYSIS; ELECTROREDUCTION; ADSORPTION; REDUCTION; COATINGS;

D O I：

10.1016/j.electacta.2009.02.078

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The electrochemical properties of natural or synthetic ferruginous clays, nontronite, montmorillonite and saponite, were studied by cyclic voltammetry and impedancemetry. Clay modified electrodes were then tested for the reduction of hydrogen peroxide under different conditions: in acidic medium without redox mediator, in phosphate buffer solutions (pH 7 or 8) with a redox cation (methyl viologen, MV2+) or a biomolecule (hemoglobin, Hb) absorbed within the clay coating. In all cases, the presence of iron species in the octahedral lattice of the clays enhanced the electrocatalytic reduction currents of H2O2. The sensitivities of H2O2 calibration curves were 0.23, 54 and 132 mA/M cm(2) for Nont, MV2+-Nont and Hb-Nont modified electrodes, respectively. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：4237 / 4244

页数：8

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