INSTITUTO DE QUIMICA, FISICA DE LOS MATERIALES, MEDIOAMBIENTE Y ENERGIA
Unidad Ejecutora - UE
Electrochemically induced ageing of polyaniline. An electrochemical impedance spectroscopy study
WALDEMAR A. MARMISOLLÉ; M. INÉS FLORIT; DIONISIO POSADAS
JOURNAL OF ELECTROANALYTICAL CHEMISTRY - (Print)
ELSEVIER SCIENCE SA
Año: 2012 vol. 673 p. 65 - 65
In this work it is shown that the impedance response of polyaniline changes with time, during the electrochemically induced ageing. The results are analysed in terms of a simple equivalent circuit which parameters change linearly with the logarithm of the ageing time. As proposed earlier, this dependence can be explained by considering that the ageing kinetics is of the Roginskii-Zeldovich or Elovich type. It is proposed that the changes in the impedance response could be associated to the decrease of the electrochemically active area of the polymer/electrolyte interface.