Electrochemical behavior of Zn/Zn(II) couples in aprotic ionic liquids based on pyrrolidinium and imidazolium cations and bis(trifluoromethanesulfonyl) imide and dicyanamide anions

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DOIResolve DOI: http://doi.org/10.1016/j.electacta.2012.11.023
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TypeArticle
Journal titleElectrochimica Acta
ISSN0013-4686
Volume89
Pages756762; # of pages: 7
SubjectAprotic; Aqueous electrolyte; Bis(trifluoromethane sulfonyl)imide; Dicyanamide; Dicyanamide anion; Electroactive species; Electrochemical behaviors; Electrode mechanism; Electrode reaction mechanisms; Electrode reactions; Exchange current densities; Imidazolium; Imidazolium cation; Overpotential; Pyrrolidinium; Room temperature ionic liquids; Shedding light; Single electron; Single-step; Strong dependences; Tafel analysis; Two-electron transfer; Cyclic voltammetry; Electrolytes; Ionic liquids; Negative ions; Positive ions; Potentiodynamic polarization; Redox reactions; Secondary batteries; Zinc
AbstractMotivated by the potential of using room temperature ionic liquids (RTILs) as electrolytes to replace traditional aqueous electrolytes for Zn-anode secondary batteries, Zn/Zn(II) redox reactions have been studied in four aprotic RTILs based on pyrrolidinium ([Pyrr]+) and imidazolium ([Im] +) cations, and bis(trifluoromethanesulfonyl)imide ([TFSI] -) and dicyanamide ([DCA]-) anions. Cyclic voltammetry results suggest a smaller overpotential for Zn redox in [Im]+ cation based and [DCA]- anion based RTILs than in [Pyrr]+ and [TFSI]- based RTILs. Potentiodynamic polarization experiments indicate a strong dependence of the electrode reaction mechanism for the Zn species on the RTIL anions. In [TFSI]- based RTILs, Zn2+ ions are the electroactive species, with the electrode reaction being a single-step, two-electron transfer process. In [DCA]- based RTILs, two-step, single-electron reactions account for the electrode mechanism. The exchange current densities derived from Tafel analysis for the Zn species in the four RTILs are greater than 10-3 mA/cm2, with the [Im]+ cation based RTIL possessing the highest value of 9.9 × 10-3 mA/cm2. The results obtained will assist in obtaining a better understanding of the electrochemical behavior of Zn in RTILs, shedding light on the development of RTILs for Zn-anode secondary batteries. © 2012 Elsevier Ltd. All Rights Reserved.
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LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); Energy, Mining and Environment (EME-EME)
Peer reviewedYes
NPARC number21269783
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Record identifier34a4d2f8-5bba-4b3d-bf74-60fc307fd66a
Record created2013-12-13
Record modified2016-05-09
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