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 - 71

1572-6657

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.