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Abstract:

The O2/Li2O2 electrode reaction has been studied on low surface area HOPG electrodes in 0.1 M LiPF6 in dimethyl sulfoxide (DMSO) electrolyte. Studies were performed using electrochemical cells coupled to a XPS spectrometer and to an AFM microscope. AFM images after electrochemical treatment at cathodic potentials exhibited 20 to 100 nm in height features, whereas anodic treatment showed a thin film of about 1 nm thickness deposited over the HOPG electrode. XPS spectra after electrochemical treatment showed surface species due to DMSO and LiPF6 decomposition. These findings indicate the high reactivity of oxygen reduction products towards the electrolyte and the solvent. The unwanted deposits formed under electrochemical operation cannot be completely eliminated from the surface even after applying high anodic potentials. This highlights the known loss of capacity of Li-air batteries, issue that must be overcome for successful applications. © 2015 Elsevier B.V. All rights reserved.

Registro:

Documento: Artículo
Título:Surface studies of lithium-oxygen redox reactions over HOPG
Autor:Marchini, F.; Herrera, S.E.; Calvo, E.J.; Williams, F.J.
Filiación:Departamento de Química Inorgánica, Analítica y Química Física, INQUIMAE-CONICET, Facultad Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón 2, Buenos Aires, C1428EHA, Argentina
Palabras clave:AFM; Electrochemistry; HOPG; Lithium-air batteries; Oxygen reduction; XPS; Dimethyl sulfoxide; Electrochemistry; Electrodes; Electrolytes; Electrolytic reduction; Film thickness; Lithium; Lithium batteries; Organic solvents; Oxygen; Redox reactions; Reduction; Surface treatment; X ray photoelectron spectroscopy; AFM; Cathodic potentials; Dimethyl sulfoxide (DMSO); Electrochemical treatments; HOPG; Lithium-air battery; Oxygen redox reactions; Oxygen Reduction; Electrochemical electrodes
Año:2016
Volumen:646
Página de inicio:154
Página de fin:159
DOI: http://dx.doi.org/10.1016/j.susc.2015.07.028
Título revista:Surface Science
Título revista abreviado:Surf Sci
ISSN:00396028
CODEN:SUSCA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00396028_v646_n_p154_Marchini

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Citas:

---------- APA ----------
Marchini, F., Herrera, S.E., Calvo, E.J. & Williams, F.J. (2016) . Surface studies of lithium-oxygen redox reactions over HOPG. Surface Science, 646, 154-159.
http://dx.doi.org/10.1016/j.susc.2015.07.028
---------- CHICAGO ----------
Marchini, F., Herrera, S.E., Calvo, E.J., Williams, F.J. "Surface studies of lithium-oxygen redox reactions over HOPG" . Surface Science 646 (2016) : 154-159.
http://dx.doi.org/10.1016/j.susc.2015.07.028
---------- MLA ----------
Marchini, F., Herrera, S.E., Calvo, E.J., Williams, F.J. "Surface studies of lithium-oxygen redox reactions over HOPG" . Surface Science, vol. 646, 2016, pp. 154-159.
http://dx.doi.org/10.1016/j.susc.2015.07.028
---------- VANCOUVER ----------
Marchini, F., Herrera, S.E., Calvo, E.J., Williams, F.J. Surface studies of lithium-oxygen redox reactions over HOPG. Surf Sci. 2016;646:154-159.
http://dx.doi.org/10.1016/j.susc.2015.07.028