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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.)

Oscillatory electro-oxidation of thiosulfate on gold

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Author(s):
Bi, Wenyan [1, 2] ; He, Yuxiu [1] ; Cabral, Murilo F. [3] ; Varela, Hamilton [3, 4] ; Yang, Jiaping [1] ; Jiang, Rongli [1] ; Gao, Qingyu [1]
Total Authors: 7
Affiliation:
[1] China Univ Min & Technol, Coll Chem Engn, Xuzhou 221008 - Peoples R China
[2] Henan Polytech Univ, Sch Phys & Chem, Jiaozuo 454000 - Peoples R China
[3] Univ Sao Paulo, Inst Chem Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil
[4] Max Planck Gesell, Fritz Haber Inst, Dept Phys Chem, D-14195 Berlin - Germany
Total Affiliations: 4
Document type: Journal article
Source: Electrochimica Acta; v. 133, p. 308-315, JUL 1 2014.
Web of Science Citations: 14
Abstract

We report experimental results on the oscillatory electro-oxidation of thiosulfate on polycrystalline gold electrode in buffered media of pH 6.0. Importantly, we observed oscillations in the current density (potential) when the system was studied under linear sweep of potential (current density). The system displayed supercritical Hopf, period-doubling, homoclinic and bursting bifurcations at different applied currents and potentials. After presenting the dynamics under both potentiostatic and galvanostatic regimes, we characterized the system in terms of its electrical (ohmic drop compensation and electrochemical impedance spectroscopy) and chemical (Capillary Electrophoresis analysis) aspects. Ohmic resistance compensation and electrochemical impedance spectroscopy confirmed the hidden N-shaped negative differential resistance oscillatory character. Capillary electrophoresis analysis revealed the predominance of different oxidation products as a function of the applied potential. Finally, we suggest a tentative mechanism underlying the kinetic instabilities. (C) 2014 Elsevier Ltd. All rights reserved. (AU)

FAPESP's process: 13/00216-3 - KINETIC INSTABILITIES DURING THE ELECTRO-OXIDATION OF SULFUR-CONTAINING COMPOUNDS ON GOLD
Grantee:Murilo Feitosa Cabral
Support type: Scholarships in Brazil - Post-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: 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