Spatio-temporal patterns in electrocatalysis: experiments, modeling and numerical simulations

• Grant number: 11/10982-0
• Support type: Scholarships in Brazil - Post-Doctorate
• Effective date (Start): January 01, 2012
• Effective date (End): September 30, 2014
• Field of knowledge: Physical Sciences and Mathematics - Chemistry - Physical-Chemistry
• Principal researcher: Hamilton Brandão Varela de Albuquerque
• Grantee: Melke Augusto do Nascimento
• Home Institution: Instituto de Química de São Carlos (IQSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
• Associated research grant: 09/07629-6 - Electrocatalysis IV: fundamental and applied aspects of electrocatalytic processes, bio-electrocatalysis and kinetic instabilities, AP.BIOEN.TEM
• Associated scholarship(s): 12/24368-4 - Theoretical study of spatio-temporal behavior in electrochemical systems, BE.EP.PD

Abstract

Complex behavior in the form of spontaneous emergence of spatio-temporal structures in reaction-transport systems has become a very active research area. Reaction-migration systems at the electrified solid liquid interface are considered ideal model systems in such investigations. It is proposed in this project the study of spatio-temporal pattern formation in far from equilibrium electrochemical systems. Specifically, the study will be carried out by means of experiments, modeling and numerical simulations, and the electro-oxidation of small organic molecules on platinum will be the investigated reactions. The experiments will be performed with an array of 32 platinum electrodes globally controlled and whose currents will be individually monitored by means of a multichannel data acquisition system. An one-dimensional annular geometry will be initially adopted. Further development includes the use of two-dimensional geometries. The base model for the spatiotemporal simulations consists of three differential equations with the space dependence initially restricted to the electrode potential.

Scientific publications

(5)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

NASCIMENTO, MELKE A.; VARELA, HAMILTON; GALLAS, JASON A. C.. Periodicity hubs and spirals in an electrochemical oscillator. Journal of Solid State Electrochemistry, v. 19, n. 11, p. 3287-3296, NOV 2015. (13/16930-7, 12/24152-1, 12/24368-4, 11/10982-0)

GONG, SHIRUI; TANG, XIAODONG; ZHENG, JUHUA; NASCIMENTO, MELKE A.; VARELA, HAMILTON; ZHAO, YUEMIN; GAO, QINGYU. Amplitude-modulated spiral waves arising from a secondary Hopf bifurcation in mixed-mode oscillatory media. Chemical Physics Letters, v. 567, p. 55-59, APR 19 2013. (11/10982-0, 09/07629-6)

DELMONDE, M. V. F.; NASCIMENTO, M. A.; NAGAO, R.; CANTANE, D. A.; LIMA, F. H. B.; VARELA, H.. Production of Volatile Species during the Oscillatory Electro-oxidation of Small Organic Molecules. Journal of Physical Chemistry C, v. 118, n. 31, p. 17699-17709, AUG 7 2014. (09/07629-6, 12/24368-4, 12/24152-1, 09/00153-6, 09/11073-3, 11/10982-0)

NASCIMENTO, MELKE A.; NAGAO, RAPHAEL; EISWIRTH, MARKUS; VARELA, HAMILTON. Coupled slow and fast surface dynamics in an electrocatalytic oscillator: Model and simulations. Journal of Chemical Physics, v. 141, n. 23, DEC 21 2014. (09/07629-6, 12/24368-4, 12/24152-1, 13/16930-7, 09/00153-6, 11/10982-0)

RAPHAEL NAGAO; MELKE A. NASCIMENTO; HAMILTON VARELA. APARATO ELETROQUÍMICO PARA SISTEMA DE AQUISIÇÃO DE DADOS MULTICANAL COM RESOLUÇÃO ESPAÇO-TEMPORAL. Química Nova, v. 38, n. 1, p. 136-143, 2015-01-00. (11/10982-0, 09/00153-6, 12/24152-1, 09/07629-6, 12/24368-4)