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


Autoria(s): Lima, Alex S.; Bocchi, Nerilso; Gomes, Homero M.; Teixeira, Marcos F. S.
Contribuinte(s)

Universidade Estadual Paulista (UNESP)

Data(s)

20/05/2014

20/05/2014

01/09/2009

Resumo

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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 x 10(-5) to 9.05 x 10(-4) mol L(-1), with a correlation coefficient of 0.9997.

Formato

6613-6625

Identificador

http://dx.doi.org/10.3390/s90906613

Sensors. Basel: Molecular Diversity Preservation International-mdpi, v. 9, n. 9, p. 6613-6625, 2009.

1424-8220

http://hdl.handle.net/11449/6941

10.3390/s90906613

WOS:000270213300002

WOS000270213300002.pdf

Idioma(s)

eng

Publicador

Molecular Diversity Preservation International-mdpi

Relação

Sensors

Direitos

openAccess

Palavras-Chave #hollandite-type manganese oxide #potassium ion #insertion electrochemical
Tipo

info:eu-repo/semantics/article