Instabilities in electrocatalysis: complex kinetics catalyzed by model Pt surfaces, Au and microelectrodes

• Grant number: 14/23916-3
• Support Opportunities: Regular Research Grants
• Start date: April 01, 2015
• End date: September 30, 2017
• Field of knowledge: Physical Sciences and Mathematics - Chemistry - Physical-Chemistry
• Principal Investigator: Elton Fabiano Sitta
• Grantee: Elton Fabiano Sitta
• Host Institution: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil

Abstract

The electro-oxidation of small organic molecules is an interesting research field due to their application in converting energy systems like fuel cells. The reactions involve several pathways strongly dependent on factors as applied potential and surface conditions, with the possibility of developing dynamic instabilities. More than an excellent example of self-organization dynamics, instabilities as potential and current oscillations, allow the estimation of kinetic parameter, as activations energy and poisoning surface constant. The present project deals with the comparative study of kinetic instabilities on the electro-oxidation of organic molecules containing one carbon. Model surfaces of Pt(111) and Pt(110) as well polycrystalline Pt and Au will be used as catalyst. The influence of space-temporal patterns on the dynamic will be analyzed comparing macro surfaces with (ultra)microelectrodes. Finally, experiments in several temperatures will allow the estimation of activation energy in conditions near and far from the thermodynamic equilibrium. The project aims also to start the studies in electrocatalysis in nonlinear conditions, managed by the supervisor of this project. The project will be developed in Chemistry Department of Federal University of São Carlos (UFSCar), in which the supervisor is Adjunct Professor (AU)

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)

DA SILVA, KALINE N.; MARUYAMA, SUELEN T.; SITTA, ELTON. High Order Cyclic Voltammograms During Electrooxidation of Ethanol Catalyzed by Gold. Journal of the Brazilian Chemical Society, v. 28, n. 9, p. 1725-1731, SEP 2017. (14/23916-3)

MELLE, GABRIEL B.; HARTL, FABIAN W.; VARELA, HAMILTON; SITTA, ELTON. The effect of solution pH on the oscillatory electro-oxidation of methanol. JOURNAL OF ELECTROANALYTICAL CHEMISTRY, v. 826, p. 164-169, OCT 1 2018. (14/23916-3, 13/16930-7, 13/07296-2, 14/08030-9)

DA SILVA, KALINE N.; NAGAO, RAPHAEL; SITTA, ELTON. Alkali Cation Effect During the Oscillatory Electroreduction of H2O2 on Pt. CHEMISTRYSELECT, v. 2, n. 35, p. 11713-11716, DEC 11 2017. (17/00089-2, 16/01817-9, 13/07296-2, 16/14758-0, 16/22262-5, 14/23916-3)