| Texto completo | |
| Autor(es): |
Rodrigues, Caio da S.
;
dos Santos, Caio G. P.
;
de Miranda, Renan C. C.
;
Parma, Eduardo
;
Varela, Hamilton
;
Nagao, Raphael
Número total de Autores: 6
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Physical Chemistry Chemical Physics; v. 22, n. 38, p. 12-pg., 2020-10-14. |
| Resumo | |
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) | |
| Processo FAPESP: | 19/03273-4 - Cálculo do expoente de Lyapunov e período morfológico de séries temporais da dissolução oscilatória de níquel |
| Beneficiário: | Caio da Silva Rodrigues |
| Modalidade de apoio: | Bolsas no Brasil - Iniciação Científica |
| Processo FAPESP: | 16/01817-9 - Desenho e controle de padrões eletroquímicos auto-organizados |
| Beneficiário: | Raphael Nagao de Sousa |
| Modalidade de apoio: | Auxílio à Pesquisa - Jovens Pesquisadores |
| Processo FAPESP: | 19/22202-0 - Preparo e caracterização de eletrodepósitos nanoestruturados de Cu/Sn formados por controle de potencial retroalimentado |
| Beneficiário: | Eduardo de Oliveira Prates Fantini Parma |
| Modalidade de apoio: | Bolsas no Brasil - Iniciação Científica |
| Processo FAPESP: | 13/16930-7 - Eletrocatálise V: processos eletrocatalíticos de interconversão entre as energias química e elétrica |
| Beneficiário: | Edson Antonio Ticianelli |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |