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Zn electrochemistry in 1-Ethyl-3-Methylimidazolium and N-Butyl-N-Methylpyrrolidinium Dicyanamides: promising new rechargeable Zn battery electrolytes

Simons, Tristan J., MacFarlane, Douglas R., Forsyth, Maria and Howlett, Patrick C. 2014, Zn electrochemistry in 1-Ethyl-3-Methylimidazolium and N-Butyl-N-Methylpyrrolidinium Dicyanamides: promising new rechargeable Zn battery electrolytes, ChemElectroChem, vol. 1, no. 10, pp. 1688-1697, doi: 10.1002/celc.201402177.

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Title Zn electrochemistry in 1-Ethyl-3-Methylimidazolium and N-Butyl-N-Methylpyrrolidinium Dicyanamides: promising new rechargeable Zn battery electrolytes
Author(s) Simons, Tristan J.
MacFarlane, Douglas R.
Forsyth, MariaORCID iD for Forsyth, Maria orcid.org/0000-0002-4273-8105
Howlett, Patrick C.ORCID iD for Howlett, Patrick C. orcid.org/0000-0002-2151-2932
Journal name ChemElectroChem
Volume number 1
Issue number 10
Start page 1688
End page 1697
Total pages 10
Publisher Wiley
Place of publication Weinheim, Germany
Publication date 2014-10-14
ISSN 2196-0216
Keyword(s) Science & Technology
Physical Sciences
Electrochemistry
batteries
electrolytes
ionic liquids
overpotential
zinc
ELECTRODEPOSITION
WATER
INTERFACE
BEHAVIOR
BIS(TRIFLUOROMETHANESULFONYL)IMIDE
PYRROLIDINIUM
CHALLENGES
TRANSPORT
Summary  We have studied both 1-ethyl-3-methylimidazolium (C2mim) and N-butyl-N-methylpyrrolidinium (C4mpyr) dicyanamide (dca) ionic liquids (ILs) containing 3 wt % H2O and 9 mol % Zn(dca)2 salt for their ability to support Zn0/2+ electrochemistry in the context of a rechargeable Zn battery. Despite the similarities of the two IL electrolyte systems [identical H2O and Zn(dca)2 contents], the system based on [C2mim] supported much higher current densities for Zn electrochemistry at greatly reduced overpotentials [−0.23 V vs. Zn pseudo-reference, 32 mA cm−2 (red) and 61 mA cm−2 (ox)] compared to the [C4mpyr]-based electrolyte [−0.84 V vs. Zn pseudo-reference, 8 mA cm−2 (red) and 15 mA cm−2 (ox)]. The overpotential for Zn deposition is reduced by 0.13 V on Zn metal surfaces compared to glassy carbon (GC), regardless of the electrolyte used. The morphologies of the Zn deposits on both GC and Zn surfaces were also studied. The Zn surfaces promote a deposition that displays a smooth morphology, resulting from an instantaneous nucleation mechanism demonstrated by chronoamperometric experiments. Finally, both [C2mim] and [C4mpyr] electrolytes were tested in symmetrical Zn|Zn cells, where it was determined that the [C2mim] system could sustain over 90 cycles at 0.1 mA cm−2, whereas the [C4mpyr] based system could only achieve 15 cycles at the more modest current density of 0.05 mA cm−2.
Language eng
DOI 10.1002/celc.201402177
Field of Research 091205 Functional Materials
030604 Electrochemistry
Socio Economic Objective 850602 Energy Storage (excl. Hydrogen)
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Grant ID CE0561616
ARC FL1101000013
ARC FL1201000019
Copyright notice ©2014, Wiley
Persistent URL http://hdl.handle.net/10536/DRO/DU:30068249

Document type: Journal Article
Collection: Institute for Frontier Materials
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Created: Tue, 16 Dec 2014, 10:53:11 EST

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