Nanogravimetric study of the surface electrooxidation process of gold

• Grant number: 07/06037-2
• Support type: Scholarships in Brazil - Master
• Effective date (Start): March 01, 2008
• Effective date (End): February 28, 2010
• Field of knowledge: Physical Sciences and Mathematics - Chemistry - Physical-Chemistry
• Principal researcher: Hamilton Brandão Varela de Albuquerque
• Grantee: Adriano Lopes Santos
• Home Institution: Instituto de Química de São Carlos (IQSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil

Abstract

Although considered a relatively inactive surface in electrochemical environment, the catalytic activity of gold has been investigated in many systems such as the oxidation of carbon monoxide at room temperature in heterogeneous catalysis. At the solid/liquid interface, according to the formation of oxygenated species, two potential regions are generally identified during the electrooxidation of small organic molecules. However, there are no reports concerning detailed studies on the impact of the change of experimental parameters such as solution pH, potential and time of polarization on the formation of oxygenated species on gold surfaces. In this way, it is proposed in the present project the systematic investigation of the electrooxidation process of polycrystalline gold surfaces under different experimental conditions such as solution pH, potential and time of polarization. Besides the electrochemical variables, the mass changes at the surface will be investigated by means of in situ monitoring with the electrochemical quartz crystal nanobalança. The main goal is to infer about the identity of the oxygenated species formed during the electrooxidation of the gold surface, and also to obtain the relative populations of the different species as a function of the solution pH and of the applied potential.

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)

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. (06/04636-3, 07/06037-2)

SANTOS, ADRIANO L.; NAGAO, RAPHAEL; OLIVEIRA, CRISTIANE P.; DE LIMA, ROBERTO B.; VARELA, HAMILTON. The role of HBF4 in electro-catalysis: Arsenic contamination and anion adsorption. JOURNAL OF ELECTROANALYTICAL CHEMISTRY, v. 660, n. 1, p. 147-152, SEP 1 2011. (09/07629-6, 07/06037-2, 09/00153-6, 09/16449-1)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

SANTOS, Adriano Lopes. Nanogravimetric study of the influence of the BF4- anion in electrocatalysis. 2010. Master's Dissertation - Universidade de São Paulo (USP). Instituto de Química de São Carlos (IQSC/BT) São Carlos.