Electrochemistry of room temperature protic ionic liquids

Zhao, Chuan, Burrell, Geoff, Torriero, Angel A.J., Separovic, Frances, Dunlop, Noel F., MacFarlane, Douglas R. and Bond, Alan M. 2008, Electrochemistry of room temperature protic ionic liquids, The journal of physical chemistry b, vol. 112, pp. 6923-6936, doi: 10.1021/jp711804j.

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Title Electrochemistry of room temperature protic ionic liquids
Author(s) Zhao, Chuan
Burrell, Geoff
Torriero, Angel A.J.ORCID iD for Torriero, Angel A.J. orcid.org/0000-0001-8616-365X
Separovic, Frances
Dunlop, Noel F.
MacFarlane, Douglas R.
Bond, Alan M.
Journal name The journal of physical chemistry b
Volume number 112
Start page 6923
End page 6936
Total pages 14
Publisher American Chemical Society
Place of publication Washington D.C.
Publication date 2008
ISSN 1520-6106
1520-5207
Summary Eighteen protic ionic liquids containing different combinations of cations and anions, hydrophobicity, viscosity, and conductivity have been synthesized and their physicochemical properties determined. In one series, the diethanolammonium cations were combined with acetate, formate, hydrogen sulfate, chloride, sulfamate, and mesylate anions. In the second series, acetate and formate anions were combined with amine bases, triethylamine, diethylamine, triethanolamine, di-n-propylamine, and di-n-butylamine. The electrochemical characteristics of the eight protic ionic liquids that are liquid at room temperature (RTPILs) have been determined using cyclic, microelectrode, and rotating disk electrode voltammetries. Potential windows of the RTPILs have been compared at glassy carbon, platinum, gold, and boron-doped diamond electrodes and generally found to be the largest in the case of glassy carbon. The voltammetry of IUPAC recommended potential scale reference systems, ferrocene/ferrocenium and cobaltocenium/cobaltocene, have been evaluated and found to be ideal in the case of the less viscous RTPILs but involve adsorption in the highly viscous ones. Other properties such as diffusion coefficients, ionic conductivity, and double layer capacitance also have been measured. The influence of water on the potential windows, viscosity, and diffusion has been studied systematically by deliberate addition of water to the dried ionic liquids. The survey highlights the problems with voltammetric studies in highly viscous room temperature protic ionic liquids and also suggests the way forward with respect to their possible industrial use.
Language eng
DOI 10.1021/jp711804j
Field of Research 030604 Electrochemistry
030505 Physical Organic Chemistry
Socio Economic Objective 970105 Expanding Knowledge in the Environmental Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2008, American Chemical Society
Persistent URL http://hdl.handle.net/10536/DRO/DU:30038948

Document type: Journal Article
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