Surface studies of lithium-oxygen redox reactions over HOPG

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 catho...

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Detalles Bibliográficos
Autores principales:	Calvo, Ernesto Julio, Williams, Federico Jose
Publicado:	2016
Materias:	AFM Electrochemistry HOPG Lithium-air batteries Oxygen reduction XPS Dimethyl sulfoxide Electrodes Electrolytes Electrolytic reduction Film thickness Lithium Lithium batteries Organic solvents Oxygen Redox reactions Reduction Surface treatment X ray photoelectron spectroscopy Cathodic potentials Dimethyl sulfoxide (DMSO) Electrochemical treatments Lithium-air battery Oxygen redox reactions Oxygen Reduction Electrochemical electrodes
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00396028_v646_n_p154_Marchini http://hdl.handle.net/20.500.12110/paper_00396028_v646_n_p154_Marchini
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00396028_v646_n_p154_Marchini
record_format	dspace
spelling	paper:paper_00396028_v646_n_p154_Marchini2023-06-08T15:03:37Z Surface studies of lithium-oxygen redox reactions over HOPG Calvo, Ernesto Julio Williams, Federico Jose 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 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. Fil:Calvo, E.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Williams, F.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2016 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00396028_v646_n_p154_Marchini http://hdl.handle.net/20.500.12110/paper_00396028_v646_n_p154_Marchini
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	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
spellingShingle	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 Calvo, Ernesto Julio Williams, Federico Jose Surface studies of lithium-oxygen redox reactions over HOPG
topic_facet	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
description	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.
author	Calvo, Ernesto Julio Williams, Federico Jose
author_facet	Calvo, Ernesto Julio Williams, Federico Jose
author_sort	Calvo, Ernesto Julio
title	Surface studies of lithium-oxygen redox reactions over HOPG
title_short	Surface studies of lithium-oxygen redox reactions over HOPG
title_full	Surface studies of lithium-oxygen redox reactions over HOPG
title_fullStr	Surface studies of lithium-oxygen redox reactions over HOPG
title_full_unstemmed	Surface studies of lithium-oxygen redox reactions over HOPG
title_sort	surface studies of lithium-oxygen redox reactions over hopg
publishDate	2016
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00396028_v646_n_p154_Marchini http://hdl.handle.net/20.500.12110/paper_00396028_v646_n_p154_Marchini
work_keys_str_mv	AT calvoernestojulio surfacestudiesoflithiumoxygenredoxreactionsoverhopg AT williamsfedericojose surfacestudiesoflithiumoxygenredoxreactionsoverhopg
_version_	1768545870877294592

Surface studies of lithium-oxygen redox reactions over HOPG

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