Mechanistic aspects of the linear stabilization of non-stationary electrochemical oscillations

Autor(es)

Cabral, Murilo F. ^[1] ; Nagao, Raphael ^[1] ; Sitta, Elton ^[1] ; Eiswirth, Markus ^{[2, 3]} ; Varela, Hamilton ^{[1, 2]}

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Chem Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil

^[2] GIST, Ertl Ctr Electrochem & Catalysis, Kwangju 500712 - South Korea

^[3] Fritz Haber Inst, D-14195 Berlin - Germany

• Tipo de documento: Artigo Científico
• Fonte: Physical Chemistry Chemical Physics; v. 15, n. 5, p. 1437-1442, 2013.
• Citações Web of Science: 20

Resumo

The problem of non-stationarity in experimentally recorded time-series is common in many (electro)chemical systems. Underlying this non-stationarity is the slow drift in some uncontrollable parameter, and it occurs in spite of the fact that all controllable parameters are kept constant. Particularly for electrochemical systems, some of us have recently suggested {[}J. Phys. Chem. C, 144, (2010), 22262-22268] an empirical method to stabilize experimental time-series. The method was exemplified for the electro-oxidation of methanol and different patterns were satisfactorily stabilized. In this paper we further elaborate some mechanistic aspects of this method and test it for the electro-oxidation of formaldehyde, a system that has some resemblance with the electro-oxidation of methanol, but produces a richer dynamics. In terms of the reaction mechanism, we were able to describe the coupling and to separate the surface processes of the two sub-systems: the fast one (or the core-oscillator) and the slow one, responsible for the drift. (AU)

• 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
• Processo FAPESP: 12/07882-6 - 2nd Ertl Symposium on Surface and Interface Chemistry
• Beneficiário: Murilo Feitosa Cabral
• Modalidade de apoio: Auxílio à Pesquisa - Reunião - Exterior
• Processo FAPESP: 09/00153-6 - Auto-organização espaço-temporal em eletrocatálise
• Beneficiário: Raphael Nagao de Sousa
• Modalidade de apoio: Bolsas no Brasil - Doutorado