A nanogravimetric study of electrooxidation of glucose

• Grant number: 18/24160-0
• Support type: Scholarships in Brazil - Scientific Initiation
• Effective date (Start): December 01, 2018
• Effective date (End): November 30, 2019
• Field of knowledge: Physical Sciences and Mathematics - Chemistry - Physical-Chemistry
• Principal Investigator: Hamilton Brandão Varela de Albuquerque
• Grantee: Aryanne Viana
• 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

Abstract

The electrooxidation reaction of glucose is used in different applications and currently its use has been highlighted in fuel cells, since, it is one of the carbohydrates present in greater quantity in the nature and in the human body, being sustainable and friendly to the environment. On polycrystalline platinum and gold electrodes, the mechanism of glucose oxidation occurs in three stages: dehydrogenation of the molecule; oxidation of glucose intermediates and; oxidation of the catalyst capable of promoting the catalysis of glucose oxidation. The use of platinum and gold electrocatalysts also allows the occurrence in alkaline medium of periodic oscillations of potential and current that promote the self-cleaning of the surface of the catalyst. Thus, in this work we aim to study the catalytic process involving the oxidation reaction of the glucose molecule on platinum and gold films through the Electrochemical Quartz Crystal Nanobalance (EQCN) to analyze mass variations during the process. Besides the experiments in conventional regime, the oscillatory processes involved in this reaction will be investigated.