Cavity microelectrode for studying manganese dioxide powder as pH sensor |
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| Authors: | Christine Cachet-Vivier Bernard Tribollet |
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| Affiliation: | a Électrochimie et Synthèse Organique, Institut de Chimie et Matériaux Paris Est, CNRS, Université Paris Est Créteil, 2-8 rue H. Dunant, 94320 Thiais, France
b Laboratoire Interfaces et Systèmes Électrochimiques, UPR 15 du CNRS, Université Pierre et Marie Curie, 4 place Jussieu, CP133, 75252 Paris Cedex 05, France |
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| Abstract: | 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. |
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| Keywords: | MnO2 pH microsensor Cavity microelectrode |
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