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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

he Impact of Water Concentration on the Electro-Oxidation of Formic Acid on Platinu

Full text
Author(s):
de Oliveira, M. G. [1] ; Melle, G. B. [1] ; Romano, R. L. [1] ; Varela, H. [1]
Total Authors: 4
Affiliation:
[1] Univ Sao Paulo, Sao Carlos Inst Chem, BR-13560970 Sao Carlos, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Journal of the Electrochemical Society; v. 169, n. 2 FEB 1 2022.
Web of Science Citations: 0
Abstract

Water plays a pivotal role in several electrocatalytic reactions. In the electrooxidation of small organic molecules, water can for instance assist the oxidation of adsorbed species or inhibit the reaction through the oxidation of surface sites. This paper is the third in a series of studies aiming at evaluating the impact of water concentration on the electro-oxidation of small organic molecules on polycrystalline platinum. The study was performed in phosphoric acid electrolyte, and the water concentration was varied from 14 to 50 mol l(-1). Voltammetric profiles and potential oscillations were studied at distinct {[}H2O]/{[}H3PO4] ratios and constant concentration of formic acid. There is a diminution in the catalytic activity accompanying the decrease in the water concentration. The removal of carbon monoxide demands oxygenated species and can proceed in the absence of water for ethanol and methanol, but not for formic acid. Under oscillatory regime, the impact of water concentration, it is seen that higher water concentration implies higher oscillation frequencies, shorter and less stable time-series, and sharper transitions from low to high potential, where the adsorbed carbon monoxide is oxidized by adsorbed oxygenated species. Results are discussed in connection with the voltammetric study and also compared with other parent systems. (c) 2022 The Electrochemical Society ({''}ECS{''}). Published on behalf of ECS by IOP Publishing Limited. (AU)

FAPESP's process: 18/23942-5 - Electrical coupling of individual electrocatalytic oscillators
Grantee:Rafael Luiz Romano
Support Opportunities: Scholarships in Brazil - Master
FAPESP's process: 20/15230-5 - Research Centre for Greenhouse Gas Innovation - RCG2I
Grantee:Julio Romano Meneghini
Support Opportunities: Research Grants - Research Centers in Engineering Program
FAPESP's process: 19/22183-6 - Electrocatalysis VI: fundamental and applied aspects of emerging and classical problems in electrochemical energy conversion
Grantee:Edson Antonio Ticianelli
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 20/03519-0 - Obtaining of kinetic parameters in the electrocatalytic oxidation of small organic molecules
Grantee:Murilo Gomes de Oliveira
Support Opportunities: Scholarships in Brazil - Scientific Initiation
FAPESP's process: 21/09489-9 - Microkinetic study of the electro-oxidation of biofuel-related molecules for the production of hydrogen and electricity
Grantee:Murilo Gomes de Oliveira
Support Opportunities: Scholarships in Brazil - Doctorate (Direct)