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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.)

The effect of the alkali metal cation on the electrocatalytic oxidation of formate on platinum

Full text
Author(s):
Previdello, Bruno A. F. [1] ; Machado, Eduardo G. [1] ; Varela, Hamilton [1, 2]
Total Authors: 3
Affiliation:
[1] Univ Sao Paulo, Inst Chem Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil
[2] Max Planck Gesell, Fritz Haber Inst, Dept Phys Chem, D-14195 Berlin - Germany
Total Affiliations: 2
Document type: Journal article
Source: RSC ADVANCES; v. 4, n. 29, p. 15271-15275, 2014.
Web of Science Citations: 10
Abstract

Non-covalent interactions between hydrated alkali metal cations and adsorbed oxygenated species on platinum might considerably inhibit some electrocatalytic reactions. We report in this communication the effect exerted by electrolyte alkali metal cations on the electro-oxidation of formate ions on platinum. The system was investigated by means of cyclic voltammetry and chronoamperometry in the presence of an electrolyte containing Li+, Na+, or K+. As already observed for other systems, the general activity towards the electro-oxidation of formate ions was found to increase in the sequence Li+ < Na+ < K+. In addition, we observed that the inhibition caused by smaller cations has a peculiar potential dependence because of the multi-peaked current profile of the electro-oxidation of formate on platinum. In this respect, we have also identified a new effect caused by cation inhibition at intermediate potentials, namely a peak splitting towards the use of smaller cations. Results are discussed in connection with mechanistic aspects of this model system. (AU)

FAPESP's process: 12/07313-1 - Electro-oxidation of mixed fuels: kinetical instabilities and mechanism
Grantee:Eduardo Giangrossi Machado
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 12/24152-1 - Complex kinetics in electrochemical systems: mechanisms, stoichiometric network analysis and numerical simulations
Grantee:Hamilton Brandão Varela de Albuquerque
Support type: Scholarships abroad - Research
FAPESP's process: 12/21204-0 - Temporal self-organization in electro-oxidation of small organic molecules: surface structure effect, water concentration and temperature
Grantee:Bruno Alarcon Fernandes Previdello
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 09/07629-6 - Electrocatalysis IV: fundamental and applied aspects of electrocatalytic processes, bio-electrocatalysis and kinetic instabilities
Grantee:Edson Antonio Ticianelli
Support type: Program for Research on Bioenergy (BIOEN) - Thematic Grants