Temporal self-organization in electro-oxidation of small organic molecules: surface structure effect, water concentration and temperature

• Grant number: 12/21204-0
• Support type: Scholarships in Brazil - Post-Doctorate
• Effective date (Start): May 01, 2013
• Effective date (End): May 31, 2017
• Field of knowledge: Physical Sciences and Mathematics - Chemistry - Physical-Chemistry
• Principal researcher: Hamilton Brandão Varela de Albuquerque
• Grantee: Bruno Alarcon Fernandes Previdello
• Home Institution: Instituto de Química de São Carlos (IQSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
• Associated research grant: 13/16930-7 - Electrocatalysis V: electrocatalytic processes of chemical and electrical energy interconversion, AP.TEM
• Associated scholarship(s): 14/23073-6 - Ethanol electrooxidation on PtNi nanoparticles: electrocatalysis and non-linear kinetics, BE.EP.PD

Abstract

Many physical-chemistry systems exhibit complex behavior when distant from thermodynamic equilibrium. Multi-stability and oscillatory kinetics, for example, have complex behavior in reactive systems. Electrochemical systems are particularly interesting when it comes to investigations. It is due to the intrinsic simplicity of the experimental manipulation and detailed temporal dynamics associated with electro-oxidation reactions of small organic molecules. This present project proposes the experimental study of temporal self-organization in electro-oxidation reactions of methanol, ethanol and glycerol. The oscillatory kinetics will be investigated on platinum in different acidic mediums (H3PO4, H2SO4 and HClO4). Among the principal experimental parameters to be explored will be to investigate the water ratio effect in the acid concentration range and temperature differences, as well as the surface structure of working electrodes (Pt (111); Pt(100); Pt(110)). The gaseous formation products will also be identified online in some cases with help of a Differential Electrochemical Mass Spectrometry (DEMS) equipment. These results will be accompanied by temporal evolution of certain volatile species at interesting water concentrations and temperatures, both in conventional configuration with electroplated platinum as in massive electrodes case using coupled flowcell.

Scientific publications

(6)

(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)

NOGUEIRA, JESSICA ALVES; VARELA, HAMILTON. Voltage Oscillations in a Polymer Electrolyte Membrane Fuel Cell with Pd-Pt/C and Pd/C Anodes. CHEMISTRYOPEN, v. 6, n. 5, p. 629-636, OCT 2017. Web of Science Citations: 1.

HARTL, FABIAN W.; ZULKE, ALANA A.; FONTE, BRUNO J.; VARELA, HAMILTON. Temperature dependence of the evolving oscillations along the electrocatalytic oxidation of methanol. JOURNAL OF ELECTROANALYTICAL CHEMISTRY, v. 800, p. 99-105, SEP 1 2017. Web of Science Citations: 3.

NOGUEIRA, JESSICA A.; ARIAS, IVONNE K. PENA; HANKE-RAUSCHENBACH, RICHARD; VIDAKOVIC-KOCH, TANJA; VARELA, HAMILTON; SUNDMACHER, KAI. Autonomous Voltage Oscillations in a Direct Methanol Fuel Cell. Electrochimica Acta, v. 212, p. 545-552, SEP 10 2016. Web of Science Citations: 7.

PREVIDELLO, B. A. F.; FERNANDEZ, P. S.; TREMILIOSI-FILHO, G.; VARELA, H. Oscillatory Electro-oxidation of Methanol on Platinum Single Crystal Electrodes. ELECTROCATALYSIS, v. 7, n. 4, p. 276-279, JUL 2016. Web of Science Citations: 6.

ZULKE, ALANA A.; VARELA, HAMILTON. The effect of temperature on the coupled slow and fast dynamics of an electrochemical oscillator. SCIENTIFIC REPORTS, v. 6, APR 15 2016. Web of Science Citations: 5.

PREVIDELLO, BRUNO A. F.; MACHADO, EDUARDO G.; VARELA, HAMILTON. The effect of the alkali metal cation on the electrocatalytic oxidation of formate on platinum. RSC ADVANCES, v. 4, n. 29, p. 15271-15275, 2014. Web of Science Citations: 10.