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Cavity microelectrode for studying manganese dioxide powder as pH sensor

Authors
Journal
Talanta
0039-9140
Publisher
Elsevier
Publication Date
Volume
82
Issue
2
Identifiers
DOI: 10.1016/j.talanta.2010.05.006
Keywords
  • Mno2
  • Ph Microsensor
  • Cavity Microelectrode

Abstract

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 Mn 2+ ions on the MnO 2 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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