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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 significance of non-covalent interactions on the electro-oxidation of alcohols on Pt and Au in alkaline media

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Author(s):
Angelucci, Camilo Andrea [1] ; Varela, Hamilton [2] ; Tremiliosi-Filho, Germano [2] ; Gomes, Janaina Fernandes [2]
Total Authors: 4
Affiliation:
[1] Univ Fed ABC, Ctr Ciencias Nat & Humanas, BR-09210170 Sao Paulo - Brazil
[2] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13560970 Sao Paulo - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Electrochemistry Communications; v. 33, p. 10-13, AUG 2013.
Web of Science Citations: 31
Abstract

The importance of the cation effect on the electro-oxidation of glycerol and ethylene glycol on Pt and Au in alkaline media was investigated by cyclic voltammetry and chronoamperometry. The reaction on Pt is influenced by OHad-M+(H2O)(x) clusters from non-covalent interactions between hydrated alkali metal cations (M+(H2O)(x), M+ = Li+, Na+ and K+) and OHad on Pt, as previously reported for many electro-catalytic reactions on Pt. Contrarily, the impact of OHad-M+(H2O)(x) clusters on the electro-oxidation of these alcohols over Au is not significant. Different behaviors of Pt and Au in alkaline solutions are not associated with distinct surface coverage degrees of oxygenated species formed on Pt and Au at the glycerol and ethylene glycol oxidation region, but rather with the potential region at which the electro-oxidation of these alcohols takes place on Pt and Au. The reactions occur at lower potentials on Pt than on Au. At high potentials, electrostatic repulsion between the positively charged Au surface and cations is mandatory for weakening non-covalent interactions between hydrated alkali metal cations and surface oxygenated species. (c) 2013 Elsevier B.V. All rights reserved. (AU)

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