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

Sensors

Alex S. Lima²  Nerilso Bocchi¹  Homero M. Gomes² 

[1] Departamento de Química – Universidade Federal de São Carlos, São Carlos – SP, Brazil; E-Mail:;Department of Physics, Chemistry and Biology, Faculty of Science and Technology, University of State of Sao Paulo (UNESP), Rua Roberto Simonsen 305, CEP 19060-900 Presidente Prudente - SP, Brazil; E-Mails:

关键词: hollandite-type manganese oxide;    potassium ion;    insertion electrochemical;   

DOI  :  10.3390/s90906613

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2009 by the authors; licensee MDPI, Basel, Switzerland