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Journal Articles Talanta Year : 2010

Cavity microelectrode for studying manganese dioxide powder as pH sensor

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.

Dates and versions

hal-04112144 , version 1 (31-05-2023)

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Christine Cachet-Vivier, Bernard Tribollet, Vincent Vivier. Cavity microelectrode for studying manganese dioxide powder as pH sensor. Talanta, 2010, 82 (2), pp.555-559. ⟨10.1016/j.talanta.2010.05.006⟩. ⟨hal-04112144⟩
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