Calculation of the Lyapunov exponent and the morphological period in the Nickel oscillatory electrodissolution time-Series

Resumo

The electrochemical dissolution of nickel in acid medium was investigated under potentiostatic control by calculating the Lyapunov exponents with the aid of the Wolf's algorithm and comparing it with the morphologic periods. The model is described by three ordinary differential equations and was integraded by 4º order Runge-Kutta numerical method. High-resolution Lyapunov diagrams were obtained by varing the parameters: external resistance and applied potential. Finger prints of the concept of universality, such as "shrimps", have been found in our simulations.