Cyclic voltammetry of Zn/Zn(II) couple in dicyanamide anion and bis-(trifluoromethylsulfonyl)imide anion based ionic liquids

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DOIResolve DOI: http://doi.org/10.1149/05025.0013ecst
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TypeArticle
Proceedings titleECS Transactions
ConferenceSymposium on Metal-Air Batteries - 222nd ECS Meeting/PRiME 2012, 7 October 2012 through 12 October 2012, Honolulu, HI
ISSN1938-5862
ISBN9781607684138
Volume50
Issue25
Pages1322; # of pages: 10
SubjectAqueous electrolyte; Bis(trifluoromethane sulfonyl)imide; Dicyanamide; Dicyanamide anion; Electron transfer process; Room temperature ionic liquids; Zn deposits; Zn particles; Cyclic voltammetry; Deposits; Morphology; Particles (particulate matter); Scanning electron microscopy; Zinc; Zinc deposits; Ionic liquids
AbstractThe electrochemistry of a Zn/Zn(II) couple was studied and compared in four kinds of room temperature ionic liquids (RTILs) (1-butyl-1-methylpyrrolidinium dicyanamide (BMP-DCA), 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl) imide (EMI-TFSI), 1-butyl-1-methylpyrrolidinium bis(trifluoromethanesulfonyl) imide (BMP-TFSI) and 1-methyl-1-pentylpyrrolidinium bis(trifluoromethanesulfonyl)imide (MPP-TFSI)), with the aim of screening desirable RTILs as replacements for traditional aqueous electrolytes for Zn rechargeable batteries. Cyclic voltammetry was used to study the reversibility and cyclability of Zn redox in each RTIL. The morphology of Zn deposits prepared from each RTIL was characterized by scanning electron microscopy. The results show that Zn redox has the best cyclability in the DCA-based RTIL, with the Zn deposit morphology characterized by finely dispersed rods composed of granular Zn particles (∼50-100 nm in size). In TFSI-based ionic liquids, the Zn/Zn(II) couple reaction had a higher current density than that in the DCA-based ionic liquid, implying different electron transfer processes. BMP-DCA and EMI-TFSI are promising RTILs worthy of further investigation. © The Electrochemical Society.
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LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); Energy, Mining and Environment (EME-EME)
Peer reviewedYes
NPARC number21269512
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Record identifier183f6dc4-ee1b-4385-82b1-30f831c314ad
Record created2013-12-12
Record modified2016-05-09
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