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Gui AL, Endres F, Wittstock G. Influence of Chemical Structure and Temperature on Oxygen Reduction Reaction and Transport in Ionic Liquids. Z PHYS CHEM 2016. [DOI: 10.1515/zpch-2016-0859] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Abstract
The ORR mechanism is studied in the context of metal-air batteries in three ionic liquids, 1-butyl-1-methylpyrrolidinium trifluoromethanesulfonate ([Py1,4]TfO), 1-ethyl-3-methylimidazolium trifluoromethanesulfonate ([EMIm]TfO) and 1-butyl-2,3-dimethylimidazolium bis(trifluoromethylsulfonyl)imide ([BDMIm]Tf2N). An electrochemical scheme combining four electrochemical techniques (CA, CV at macro-disk electrode, linear sweep voltammetry at rotating disk electrode (LSV at RDE) and CV at microelectrode (CV at ME)) is developed to perform fast determination of oxygen parameters (concentration c* and diffusion coefficient D) of electrolyte at various conditions. The electrochemical study has revealed the influence of acidity of ionic liquid to the reversibility of the O2/O2˙− redox reaction. The influence of temperature (up to 100°C) on the mechanism change of ORR as well as the changes of c* and D in three ionic liquids have been examined using the developed electrochemical method. The result has shown that the T-dependency of c* is much less prominent than that of D.
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Affiliation(s)
- Alicia L. Gui
- Carl von Ossietzyk University of Oldenburg , Faculty of Mathematics and Natural Science, Center of Interface Science, Institute of Chemistry , D-26111 Oldenburg , Germany
| | - Frank Endres
- Clausthal University of Technology , Institute of Electrochemistry , Arnold-Sommerfeld-Strasse 6 , 38678 Clausthal-Zellerfeld , Germany
| | - Gunther Wittstock
- Carl von Ossietzyk University of Oldenburg , Faculty of Mathematics and Natural Science, Center of Interface Science, Institute of Chemistry , D-26111 Oldenburg , Germany
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