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Oscilatory kinetics and electrocatalysis during electro-oxidation of small organic molecules using single-crystal electrodes

Grant number: 15/20443-0
Support Opportunities:Scholarships abroad - Research Internship - Doctorate
Effective date (Start): February 01, 2016
Effective date (End): January 31, 2017
Field of knowledge:Physical Sciences and Mathematics - Chemistry - Physical-Chemistry
Principal Investigator:Ernesto Rafael Gonzalez
Grantee:Loriz Francisco Sallum
Supervisor: Juan Miguel Feliu Martinez
Host Institution: Instituto de Química de São Carlos (IQSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
Research place: Universidad de Alicante (UA), Spain  
Associated to the scholarship:13/24162-0 - Electro-oxidation of small organic molecules in alkaline medium: complex kinetics and electrocatalysis, BP.DR


Electrochemical studies in systems far from thermodynamic equilibrium have been highlighted in the scientific community, due mainly to the facility with which instabilities emerge and also for the simplicity in handling control parameters. The electro-oxidation study of small organic molecules is certainly a major issue in electrocatalysis research because of their potential use as chemical energy converters in electric systems. Systems that exhibit complex dynamics have a higher thermodynamic efficiency over their behavior in conventional regime. In an alkaline medium, these systems have some peculiarities in the dynamic instabilities when compared with reactions at low pH values. Nothingis knownof the impact of different types of surface defects and of surfacedefects density on the oscillatory kinetic progress. Thisprojectaims to reveal, fromamechanistic point of view, the oscillatory electro-oxidation of small organic molecules, especially ethanol, in an alkaline medium on surfaces with different crystallographic orientations of platinum, palladium and gold. Such analyzes will be performed using in situFourier transform infrared spectroscopy (FTIR) and quantum tunneling microscopy (STM). These techniques, together with conventional electrochemical techniques will help to elucidate the reaction mechanism associated with instabilities. (AU)

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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)
SALLUM, LORIZ F.; MOTA-LIMA, ANDRESSA; GONZALEZ, ERNESTO R.. Galvano- and Potentio-dynamic studies during ethanol electro-oxidation reaction in acid vs. alkaline media: Energy dissipation and blocking nature of potassium. Electrochimica Acta, v. 293, p. 247-259, . (15/20443-0, 13/24162-0)
SALLUM, LORIZ FRANCISCO; GONZALEZ, ERNESTO RAFAEL; MIGUEL FELIU, JUAN. Potential oscillations during electro-oxidation of ethanol on platinum in alkaline media: The role of surface sites. Electrochemistry Communications, v. 72, p. 83-86, . (15/20443-0, 13/24162-0)
SALLUM, LORIZ F.; GONZALEZ, ERNESTO R.; MOTA-LIMA, ANDRESSA. Quantifying the turnover frequency for ethanol electro-oxidation on polycrystalline Pt in acid and alkaline media. Electrochemistry Communications, v. 90, p. 26-29, . (15/20443-0, 13/24162-0)

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