| Texto completo | |
| Autor(es): |
Bi, Wenyan
[1, 2]
;
He, Yuxiu
[1]
;
Cabral, Murilo F.
[3]
;
Varela, Hamilton
[3, 4]
;
Yang, Jiaping
[1]
;
Jiang, Rongli
[1]
;
Gao, Qingyu
[1]
Número total de Autores: 7
|
| Afiliação do(s) autor(es): | [1] China Univ Min & Technol, Coll Chem Engn, Xuzhou 221008 - Peoples R China
[2] Henan Polytech Univ, Sch Phys & Chem, Jiaozuo 454000 - Peoples R China
[3] Univ Sao Paulo, Inst Chem Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil
[4] Max Planck Gesell, Fritz Haber Inst, Dept Phys Chem, D-14195 Berlin - Germany
Número total de Afiliações: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Electrochimica Acta; v. 133, p. 308-315, JUL 1 2014. |
| Citações Web of Science: | 14 |
| Resumo | |
We report experimental results on the oscillatory electro-oxidation of thiosulfate on polycrystalline gold electrode in buffered media of pH 6.0. Importantly, we observed oscillations in the current density (potential) when the system was studied under linear sweep of potential (current density). The system displayed supercritical Hopf, period-doubling, homoclinic and bursting bifurcations at different applied currents and potentials. After presenting the dynamics under both potentiostatic and galvanostatic regimes, we characterized the system in terms of its electrical (ohmic drop compensation and electrochemical impedance spectroscopy) and chemical (Capillary Electrophoresis analysis) aspects. Ohmic resistance compensation and electrochemical impedance spectroscopy confirmed the hidden N-shaped negative differential resistance oscillatory character. Capillary electrophoresis analysis revealed the predominance of different oxidation products as a function of the applied potential. Finally, we suggest a tentative mechanism underlying the kinetic instabilities. (C) 2014 Elsevier Ltd. All rights reserved. (AU) | |
| Processo FAPESP: | 12/24152-1 - Cinética complexa em sistemas eletroquímicos: mecanismos, análise de redes estequiométricas e simulações numéricas |
| Beneficiário: | Hamilton Brandão Varela de Albuquerque |
| Modalidade de apoio: | Bolsas no Exterior - Pesquisa |
| Processo FAPESP: | 13/00216-3 - Instabilidades cinéticas durante a eletro-oxidação de compostos contendo enxofre sobre ouro |
| Beneficiário: | Murilo Feitosa Cabral |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 09/07629-6 - Eletrocatálise IV: aspectos fundamentais e aplicados dos processos eletrocatalíticos, bio-eletrocatálise e instabilidades cinéticas |
| Beneficiário: | Edson Antonio Ticianelli |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa BIOEN - Temático |