A rotating ring disk electrode study of the oxygen reduction reaction in lithium containing dimethyl sulfoxide electrolyte: Role of superoxide
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 radic...
Guardado en:
| Autor principal: | |
|---|---|
| Publicado: |
2014
|
| Materias: | |
| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00134651_v161_n14_pA2204_Torres http://hdl.handle.net/20.500.12110/paper_00134651_v161_n14_pA2204_Torres |
| Aporte de: |
| id |
paper:paper_00134651_v161_n14_pA2204_Torres |
|---|---|
| record_format |
dspace |
| spelling |
paper:paper_00134651_v161_n14_pA2204_Torres2023-06-08T14:35:43Z A rotating ring disk electrode study of the oxygen reduction reaction in lithium containing dimethyl sulfoxide electrolyte: Role of superoxide Calvo, Ernesto Julio 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 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. Fil:Calvo, E.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2014 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00134651_v161_n14_pA2204_Torres http://hdl.handle.net/20.500.12110/paper_00134651_v161_n14_pA2204_Torres |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
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 |
| spellingShingle |
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 Calvo, Ernesto Julio A rotating ring disk electrode study of the oxygen reduction reaction in lithium containing dimethyl sulfoxide electrolyte: Role of superoxide |
| topic_facet |
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 |
| description |
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. |
| author |
Calvo, Ernesto Julio |
| author_facet |
Calvo, Ernesto Julio |
| author_sort |
Calvo, Ernesto Julio |
| title |
A rotating ring disk electrode study of the oxygen reduction reaction in lithium containing dimethyl sulfoxide electrolyte: Role of superoxide |
| title_short |
A rotating ring disk electrode study of the oxygen reduction reaction in lithium containing dimethyl sulfoxide electrolyte: Role of superoxide |
| title_full |
A rotating ring disk electrode study of the oxygen reduction reaction in lithium containing dimethyl sulfoxide electrolyte: Role of superoxide |
| title_fullStr |
A rotating ring disk electrode study of the oxygen reduction reaction in lithium containing dimethyl sulfoxide electrolyte: Role of superoxide |
| title_full_unstemmed |
A rotating ring disk electrode study of the oxygen reduction reaction in lithium containing dimethyl sulfoxide electrolyte: Role of superoxide |
| title_sort |
rotating ring disk electrode study of the oxygen reduction reaction in lithium containing dimethyl sulfoxide electrolyte: role of superoxide |
| publishDate |
2014 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00134651_v161_n14_pA2204_Torres http://hdl.handle.net/20.500.12110/paper_00134651_v161_n14_pA2204_Torres |
| work_keys_str_mv |
AT calvoernestojulio arotatingringdiskelectrodestudyoftheoxygenreductionreactioninlithiumcontainingdimethylsulfoxideelectrolyteroleofsuperoxide AT calvoernestojulio rotatingringdiskelectrodestudyoftheoxygenreductionreactioninlithiumcontainingdimethylsulfoxideelectrolyteroleofsuperoxide |
| _version_ |
1768544893779574784 |