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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todo:paper_00396028_v646_n_p154_Marchini2023-10-03T14:49:52Z Surface studies of lithium-oxygen redox reactions over HOPG Marchini, F. Herrera, S.E. Calvo, E.J. Williams, F.J. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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 Marchini, F. Herrera, S.E. Calvo, E.J. Williams, F.J. 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. |
| format |
JOUR |
| author |
Marchini, F. Herrera, S.E. Calvo, E.J. Williams, F.J. |
| author_facet |
Marchini, F. Herrera, S.E. Calvo, E.J. Williams, F.J. |
| author_sort |
Marchini, F. |
| 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 |
| url |
http://hdl.handle.net/20.500.12110/paper_00396028_v646_n_p154_Marchini |
| work_keys_str_mv |
AT marchinif surfacestudiesoflithiumoxygenredoxreactionsoverhopg AT herrerase surfacestudiesoflithiumoxygenredoxreactionsoverhopg AT calvoej surfacestudiesoflithiumoxygenredoxreactionsoverhopg AT williamsfj surfacestudiesoflithiumoxygenredoxreactionsoverhopg |
| _version_ |
1807323585811841024 |