| Full text | |
| Author(s): |
Rodrigues, Caio da S.
;
dos Santos, Caio G. P.
;
de Miranda, Renan C. C.
;
Parma, Eduardo
;
Varela, Hamilton
;
Nagao, Raphael
Total Authors: 6
|
| Document type: | Journal article |
| Source: | Physical Chemistry Chemical Physics; v. 22, n. 38, p. 12-pg., 2020-10-14. |
| Abstract | |
The oscillatory electrodissolution of nickel is one among several reactions utilized as a model-system to study the emergence of oscillations and pattern formation in electrochemical interfaces, in addition to frequently providing experimental proofs for theoretical predictions in synchronization engineering. The reaction was modeled in 1992 by Haim and co-workers [J. Phys. Chem.1992,96, 2676] and since then the model has been used with great success. Although some numerical studies have been done in this regard, there is apparently no detailed investigation of the effect of control parameters on the complex dynamics of nickel dissolution. Here, we provide a well-detailed and rigorous analysis of the effect of the external resistance and applied potential by simulating high-resolution phase diagrams based on the calculation of Lyapunov exponents and isospike diagrams. Our findings clearly indicate a strong dependence of the self-similar periodic islands, the so-called shrimps (i.e., periodic islands within chaotic domains in the parameter space), with the control parameters. Overall, we have observed a low density of periodic structures in the phase diagrams, being completely suppressed for large values of resistance and potential. The shrimp-like structures become gradually elongated with an increase of the control parameters to the point where only diagonally aligned periodic bands intertwined with chaotic domains are present. Interestingly, period-doubling cascades were observed not only on the shrimps but also on the periodic bands. The detailed distribution of chaos and periodicity of oscillatory electrodissolution reactions in resistance-potential phase diagrams can bring, for instance, important information to experimentalists to set a desired dynamic behavior and, therefore, to create novel nanostructured self-organized materials. (AU) | |
| FAPESP's process: | 19/03273-4 - Calculation of the Lyapunov exponent and the morphological period of time series in nickel oscillatory dissolution |
| Grantee: | Caio da Silva Rodrigues |
| Support Opportunities: | Scholarships in Brazil - Scientific Initiation |
| FAPESP's process: | 16/01817-9 - Design and control of self-organized electrochemical patterns |
| Grantee: | Raphael Nagao de Sousa |
| Support Opportunities: | Research Grants - Young Investigators Grants |
| FAPESP's process: | 19/22202-0 - Preparation and characterization of nanostructured Cu/Sn electrodeposits formed by feedback potential control |
| Grantee: | Eduardo de Oliveira Prates Fantini Parma |
| Support Opportunities: | Scholarships in Brazil - Scientific Initiation |
| FAPESP's process: | 13/16930-7 - Electrocatalysis V: electrocatalytic processes of chemical and electrical energy interconversion |
| Grantee: | Edson Antonio Ticianelli |
| Support Opportunities: | Research Projects - Thematic Grants |