Cavity microelectrode for studying manganese dioxide powder as pH sensor

被引：11

作者：

Cachet-Vivier, Christine ^{[1
]}

Tribollet, Bernard ^{[2
]}

Vivier, Vincent ^{[2
]}

机构：

[1] Univ Paris Est Creteil, CNRS, Inst Chim & Mat Paris Est, F-94320 Thiais, France

[2] Univ Paris 06, CNRS, UPR 15, Lab Interfaces & Syst Electrochim, F-75252 Paris 05, France

来源：

TALANTA | 2010年 / 82卷 / 02期

关键词：

MnO2; pH microsensor; Cavity microelectrode; SURFACE CHARACTERIZATION; ELECTRODE; MICROSCOPY; VICINITY; CATHODE;

D O I：

10.1016/j.talanta.2010.05.006

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The potential-pH response of an electrolytic manganese dioxide is investigated by means of a cavity microelectrode (CME). The potential-pH curves show a complex evolution that could be explained by the disporportionation of MnOOH species, leading to the formation of Mn2+ ions on the MnO2 surface. Such a behaviour is not suited for pH sensor application. However when the tip of the electrode is coated by a Nafion membrane, the potential-pH evolution shows a unique slope close to -60 mV pH(-1). In addition, the sensor exhibits short time responses to pH variations, a good selectivity, and it can be easily renewed compared to classical sensors. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：555 / 559

页数：5

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