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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 Chaotropicity on the SO2 Oxidation Reaction: When Spectator Species Determine the Reaction Pathway

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Author(s):
Dourado, Andre H. B. [1, 2] ; Silva-Jr, Norberto A. ; Munhos, Renan L. [3] ; Del Colle, Vinicius [4, 5] ; Arenz, Matthias [6] ; Varela, Hamilton [4] ; Cordoba de Torresi, I, Susana
Total Authors: 7
Affiliation:
[1] I, Univ Sao Paulo, Inst Quim, Av Prof Lineu Prestes 748, BR-05508080 Sao Paulo, SP - Brazil
[2] Tech Univ Munich, Nonequilibrium Chem Phys, Dept Phys, James Franck Str 1, D-85748 Garching - Germany
[3] Silva-Jr, Jr., Norberto A., I, Univ Sao Paulo, Inst Quim, Av Prof Lineu Prestes 748, BR-05508080 Sao Paulo, SP - Brazil
[4] Univ Sao Paulo, Inst Quim Sao Carlos, CP 780, BR-13560970 Sao Carlos, SP - Brazil
[5] Univ Fed Alagoas, Dept Quim, Campus Arapiraca, Av Manoel Severino Barbosa, BR-57309005 Arapiraca, AI - Brazil
[6] Univ Bern, Dept Chem & Biochem, Freiestr 3, CH-3012 Bern - Switzerland
Total Affiliations: 6
Document type: Journal article
Source: CHEMELECTROCHEM; v. 7, n. 8 JAN 2020.
Web of Science Citations: 0
Abstract

The electrochemical SO2 oxidation reaction (SO2OR) is a promising alternative to the O-2 evolution reaction for H-2 electrochemical generation. The SO2OR exhibits a low thermodynamic potential and small kinetic barrier, and Au has been observed to be a very active catalyst. For this material, nonlinear dynamic behavior is observed, which is related to the electrolyte chaotropicity at the solid-liquid interface. In this work, the influence of the chaotropicity was investigated by electrochemical and spectroelectrochemical techniques, and the main reasons for the dependence on the chaotropicity were investigated. The electrochemical response as a function of the chaotropicity was determined as a function of the mechanism observed, and the reaction pathway selection was related to the intermediate adsorption, which in turn was controlled by the interfacial water structure. The ``neutral{''} chaotropicity was found to be the optimum condition for SO2OR. (AU)

FAPESP's process: 15/08300-9 - Study of L-cysteine and L-cystine adsorption and oxidation on Pt electrode by internal reflection infrared spectroscopy and DEMS
Grantee:André Henrique Baraldi Dourado
Support Opportunities: Scholarships abroad - Research Internship - Doctorate (Direct)
FAPESP's process: 19/02438-0 - Study of the oxidation of sulfur dioxide in nanostructured gold catalysts, influence of particle size and matrix
Grantee:Norberto Alves da Silva Júnior
Support Opportunities: Scholarships in Brazil - Scientific Initiation
FAPESP's process: 15/26308-7 - Optimization of the physicochemical properties of nano -structured materials for applications in molecular recognition, catalysis and energy conversion/storage
Grantee:Roberto Manuel Torresi
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 13/25592-8 - Study of L-cysteine and L-cystine adsorption on platinum electrodes
Grantee:André Henrique Baraldi Dourado
Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
FAPESP's process: 13/16930-7 - Electrocatalysis V: electrocatalytic processes of chemical and electrical energy interconversion
Grantee:Edson Antonio Ticianelli
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 17/09346-8 - Electrochemical oxidation of Sulfur dioxide onto nanostrutured gold catalysts
Grantee:Renan Lopes Munhos
Support Opportunities: Scholarships in Brazil - Master