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Abstract:

We have employed the rotating ring disk electrode (RRDE) technique to study the oxygen reduction reaction (ORR) on gold and glassy carbon cathodes in dimethyl sulfoxide (DMSO) electrolytes containing lithium salts. At the gold ring electrode at 3.0 V vs. Li/Li+ (0.1 M LiPF6) soluble superoxide radical anion undergoes oxidation to O2 under convective-diffusion conditions. For both glassy carbon and gold cathodes, typical oxygen reduction current-potential curves are sensitive to rotation speed and undergo a maximum and further electrode passivation by formation of Li2O2 while the Au ring electrode currents follow the same peak shape with detection of soluble superoxide at the ring downstream in the electrolyte solution. Unlike the behavior in acetonitrile-lithium solutions, LiO2 is more stable in DMSO and can diffuse out in solution and be detected at the ring electrode. While in cyclic voltammetry both time and potential effects are convoluted, we have carried out RRDE chrono-amperometry experiments at the disk electrode with detection of superoxide at the Au ring so that thus potential and time effects were clearly separated. The superoxide oxidation ring currents exhibit a maximum at 2.2 V due to the interplay of O2- formation by one-electron O2 reduction, Li2O2 disproportionation and two-electron O2 reduction. © 2014 The Electrochemical Society.

Registro:

Documento: Artículo
Título:A rotating ring disk electrode study of the oxygen reduction reaction in lithium containing dimethyl sulfoxide electrolyte: Role of superoxide
Autor:Torres, W.; Mozhzhukhina, N.; Tesio, A.Y.; Calvo, E.J.
Filiación:INQUIMAE, Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria, Buenos Aires, AR-1428, Argentina
Palabras clave:Carbon; Cathodes; Cyclic voltammetry; Dimethyl sulfoxide; Electrolytes; Electrolytic reduction; Glass; Glassy carbon; Gold; Lithium; Organic solvents; Oxygen; Rotating disks; Dimethyl sulfoxide (DMSO); Electrode passivation; Electrolyte solutions; Oxygen reduction currents; Oxygen reduction reaction; Rotating ring-disk electrode; Rotating ring-disk electrode techniques; Superoxide radical anions; Electrodes
Año:2014
Volumen:161
Número:14
Página de inicio:A2204
Página de fin:A2209
DOI: http://dx.doi.org/10.1149/2.0801414jes
Título revista:Journal of the Electrochemical Society
Título revista abreviado:J Electrochem Soc
ISSN:00134651
CODEN:JESOA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00134651_v161_n14_pA2204_Torres

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Citas:

---------- APA ----------
Torres, W., Mozhzhukhina, N., Tesio, A.Y. & Calvo, E.J. (2014) . A rotating ring disk electrode study of the oxygen reduction reaction in lithium containing dimethyl sulfoxide electrolyte: Role of superoxide. Journal of the Electrochemical Society, 161(14), A2204-A2209.
http://dx.doi.org/10.1149/2.0801414jes
---------- CHICAGO ----------
Torres, W., Mozhzhukhina, N., Tesio, A.Y., Calvo, E.J. "A rotating ring disk electrode study of the oxygen reduction reaction in lithium containing dimethyl sulfoxide electrolyte: Role of superoxide" . Journal of the Electrochemical Society 161, no. 14 (2014) : A2204-A2209.
http://dx.doi.org/10.1149/2.0801414jes
---------- MLA ----------
Torres, W., Mozhzhukhina, N., Tesio, A.Y., Calvo, E.J. "A rotating ring disk electrode study of the oxygen reduction reaction in lithium containing dimethyl sulfoxide electrolyte: Role of superoxide" . Journal of the Electrochemical Society, vol. 161, no. 14, 2014, pp. A2204-A2209.
http://dx.doi.org/10.1149/2.0801414jes
---------- VANCOUVER ----------
Torres, W., Mozhzhukhina, N., Tesio, A.Y., Calvo, E.J. A rotating ring disk electrode study of the oxygen reduction reaction in lithium containing dimethyl sulfoxide electrolyte: Role of superoxide. J Electrochem Soc. 2014;161(14):A2204-A2209.
http://dx.doi.org/10.1149/2.0801414jes