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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.)

Influence of Anion Adsorption on the Parallel Reaction Pathways in the Oscillatory Electro-oxidation of Methanol

Full text
Author(s):
Nagao, Raphael [1] ; Cantane, Daniel A. [1] ; Lima, Fabio H. B. [1] ; Varela, Hamilton [1]
Total Authors: 4
Affiliation:
[1] Univ Sao Paulo, Inst Chem Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Journal of Physical Chemistry C; v. 117, n. 29, p. 15098-15105, JUL 25 2013.
Web of Science Citations: 23
Abstract

We report the experimental study of the impact of anion adsorption on the two parallel pathways of CO2 formation during the electro-oxidation of methanol on platinum. The effect of nature of the supporting electrolyte (HClO4 and H2SO4) was investigated at two methanol concentrations. Voltammetric profiles and oscillatory time series of the electrode potential were registered in conjunction with the evolution of the production of carbon dioxide and methylformate, as measured by means of on line differential electrochemical mass spectrometry (DEMS). In all conditions studied, the production of CO2 was higher in the presence of HClO4 rather than that in H2SO4. Importantly, the inhibition caused by anion adsorption was generally more pronounced in the direct pathway, i.e., the non-COad pathway. Furthermore, we have noted an additional peak commonly observed at high potentials during the oscillatory electro-oxidation of small organic molecules can be generally attributed to the oxidative removal of COad. Altogether, the effect of anion adsorption is discussed in connection with both the oscillatory kinetics and the dynamics of adsorbed species, contributing thus to a comprehensive physical-chemistry description of the surface processes. (AU)

FAPESP's process: 08/05156-0 - Electrocatalysis of the ethanol electrooxidation on platinum monolayers deposited on core-shell nanoparticles
Grantee:Fabio Henrique Barros de Lima
Support Opportunities: Regular Research Grants
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 Opportunities: Program for Research on Bioenergy (BIOEN) - Thematic Grants
FAPESP's process: 09/11073-3 - Investigation of the mechanism of ethanol electro-oxidation on metallic nanoparticles.
Grantee:Daniel Augusto Cantane
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 09/00153-6 - Spatio-temporal self-organization in electrocatalysis
Grantee:Raphael Nagao de Sousa
Support Opportunities: Scholarships in Brazil - Doctorate