An Electrochemical Sensor Based on Nanostructured Hollandite-type Manganese Oxide for Detection of Potassium Ions

The participation of cations in redox reactions of manganese oxides provides an opportunity for development of chemical sensors for non-electroactive ions. A sensor based on a nanostructured hollandite-type manganese oxide was investigated for voltammetric detection of potassium ions. The detection...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2009-09, Vol.9 (9), p.6613-6625
Main Authors: Lima, Alex S, Bocchi, Nerilso, Gomes, Homero M, Teixeira, Marcos F S
Format: Article
Language:English
Subjects:
Carbon
Electrodes
Electrolytes
Electrons
hollandite-type manganese oxide
insertion electrochemical
Laboratories
Potassium
potassium ion
Sensors
Voltammetry
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Summary:The participation of cations in redox reactions of manganese oxides provides an opportunity for development of chemical sensors for non-electroactive ions. A sensor based on a nanostructured hollandite-type manganese oxide was investigated for voltammetric detection of potassium ions. The detection is based on the measurement of anodic current generated by oxidation of Mn(III) to Mn(IV) at the surface of the electrode and the subsequent extraction of the potassium ions into the hollandite structure. In this work, an amperometric procedure at an operating potential of 0.80 V (versus SCE) is exploited for amperometric monitoring. The current signals are linearly proportional to potassium ion concentration in the range 4.97 × 10(-5) to 9.05 × 10(-4) mol L(-1), with a correlation coefficient of 0.9997.
ISSN:1424-8220
1424-8220
DOI:10.3390/s90906613