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Spatiotemporal self-organization in solid / liquid interface: electrooxidation of formic acid on platinum

Grant number: 06/04636-3
Support type:Scholarships in Brazil - Master
Effective date (Start): March 01, 2007
Effective date (End): February 28, 2009
Field of knowledge:Physical Sciences and Mathematics - Chemistry
Principal researcher:Hamilton Brandão Varela de Albuquerque
Grantee:Raphael Nagao de Sousa
Home Institution: Instituto de Química de São Carlos (IQSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil


Spatio-temporal pattern formation in reaction-transport systems has becoming a very active research area. Complex behavior in these systems takes place under far from thermodynamical equilibrium conditions and results from the interplay between nonlinear temporal dynamics and transport properties. Due to some properties of lateral information exchange and easy global control, reaction-migration systems at the solid/liquid interface are considered ideal model systems. It is proposed in this projet the experimntal study of the oscillatory dynamics associated to the electrooxidation reaction of formic acid on platinum surfaces. The experiments will be performed in sulphuric, phosforic and perchloric acid aqueous solutions perturbed by the presence of small amounts of tetrafluoroborate, hexafluorophosphate, and trifluoromethanesulphonate anions. The key aspects of the system’s temporal dynamics will be investigated by means of usual electrochemical techniques and also in terms of gravimetric studies with the electrochemical quartz crystal nanobalance. From the spatio-temporal point of view, the experiments will be carried out with a set of sixty four platinum electrodes kept under global control and in which the individual currents will be be independently followed by means of a multichanel data acquisition system. An anular one-dimentional arrangement will be initially adopted and the dynamic investigated under the influence of negative global coupling.

Scientific publications
(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)
CARBONIO, EMILIA A.; NAGAO, RAPHAEL; GONZALEZ, ERNESTO R.; VARELA, HAMILTON. Temperature effects on the oscillatory electro-oxidation of methanol on platinum. Physical Chemistry Chemical Physics, v. 11, n. 4, p. 665-670, 2009. Web of Science Citations: 30.
SITTA‚ E.; SANTOS‚ A.L.; NAGAO‚ R.; VARELA‚ H. Nanogravimetric study of the complex voltammetric response in the electro-oxidation of methanol on platinum. Electrochimica Acta, v. 55, n. 2, p. 404-409, 2009.
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
SOUSA, Raphael Nagao de. Efeito da temperatura na eletro-oxidação oscilatória de ácido fórmico sobre platina: experimentos e simulações. 2009. Master's Dissertation - Universidade de São Paulo (USP). Instituto de Química de São Carlos São Carlos.

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