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
• Start date: February 01, 2016
• End date: 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
• Institution abroad: 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

Abstract

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)

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, JAN 10 2019. (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, NOV 2016. (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, MAY 2018. (15/20443-0, 13/24162-0)