Effect of water and dimethyl sulfoxide on oxygen reduction reaction in bis(trifluoromethanesulfonyl)imide-based ionic liquids

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DOIResolve DOI: http://doi.org/10.1149/2.010404jes
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TypeArticle
Journal titleJournal of the Electrochemical Society
ISSN0013-4651
Volume161
Issue4
PagesA458A466
SubjectBis(trifluoromethane sulfonyl)imide; Dimethyl sulfoxide (DMSO); Electrochemical window; Enhanced conductivity; One-electron transfer; Oxygen reduction reaction; Room temperature ionic liquids; Electrolytic reduction; Ionic liquids; Redox reactions; Organic solvents
AbstractIn this work, we have investigated the conductivity, electrochemical window (ECW) and oxygen reduction reaction (ORR) in various bis(trifluoromethanesulfonyl)imide (TFSI)-based room temperature ionic liquids (RTILs). In an attempt to improve ORR activity in RTILs, water and/or dimethyl sulfoxide (DMSO) are added to one TFSI-based RTIL, 1-butyl-1-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (BMP-TFSI), and the effect of additives on its conductivity, ECW and ORR is explored. The results show that as-received TFSI-based ionic liquids (ILs) have a low conductivity due to their large constituent ions. The addition of water and/or DMSO has considerable effect on the conductivity of the IL mixture. The studied TFSI-based RTILs have wide ECWs and the presence of water and/or DMSO causes an apparent narrowing of the observed potential window. For all TFSI-based ILs, the oxygen redox peaks can be assigned to an O2/O2-* one-electron transfer process. By adding water, the O2/O2-* redox potential shifts in a more positive direction in BMP-TFSI; e.g., about 0.27 V more positive in BMP-TFSI with 1 wt% water addition, due to its high acceptor number (AN) and the proton effect. The addition of DMSO also contributes to the improvement in ORR activity in BMP-TFSI through enhanced conductivity and redox reversibility.
Publication date
PublisherThe Electrochemical Society
LanguageEnglish
AffiliationEnergy, Mining and Environment; National Research Council Canada
Peer reviewedYes
NPARC number21272932
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Record identifier17345a45-0edb-4aff-adbf-e0b11f8617bf
Record created2014-12-03
Record modified2016-05-09
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