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Electrochemistry of tris(2,2′-bipyridyl) cobalt(II) in ionic liquids and aprotic molecular solvents on glassy carbon and platinum electrodes

Cabral, Diogo, Howlett, Patrick C., Pringle, Jennifer M., Zhang, Xinyi and MacFarlane, Douglas 2015, Electrochemistry of tris(2,2′-bipyridyl) cobalt(II) in ionic liquids and aprotic molecular solvents on glassy carbon and platinum electrodes, Electrochimica acta, vol. 180, pp. 419-426, doi: 10.1016/j.electacta.2015.08.135.

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Title Electrochemistry of tris(2,2′-bipyridyl) cobalt(II) in ionic liquids and aprotic molecular solvents on glassy carbon and platinum electrodes
Author(s) Cabral, Diogo
Howlett, Patrick C.ORCID iD for Howlett, Patrick C. orcid.org/0000-0002-2151-2932
Pringle, Jennifer M.ORCID iD for Pringle, Jennifer M. orcid.org/0000-0002-2729-2838
Zhang, Xinyi
MacFarlane, Douglas
Journal name Electrochimica acta
Volume number 180
Start page 419
End page 426
Total pages 8
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2015-10-20
ISSN 0013-4686
Keyword(s) Cobalt complex
Electrode kinetics
Electrolyte
Ionic liquids
Redox couple
Summary The tris(2,2′-bipyridyl) complexes of cobalt(II) and (III) ([Co(bpy)3]2+/3+) produce a redox couple of great interest in thermoelectrochemical cells and dye sensitized solar cells including both types of devices based on ionic liquid electrolytes. We present a systematic study of the electrochemistry of [Co(bpy)3]2+ [NTf2]-2 in two ionic liquids (ILs) based on the 1-ethyl-3-methylimidazolium (C2mim) cation and two ILs based on the 1-butyl-1-methylpyrrolidinium cation (C4mpyr), as well as three aprotic molecular solvents. Platinum (Pt) and glassy carbon (GC) working electrodes were compared. In all solvents better electrochemical responses were observed on GC, which yielded higher currents in the cyclic voltammograms and lower rate constants for the redox reaction. The [Co(bpy)3]1+/2+ couple is also readily observed, but this redox reaction is chemically irreversible, possibly because the [Co(bpy)3]1+ complex dissociates. However, the [Co(bpy)3]1+/2+ reaction is chemically reversible in all of the solvents studied, except 3-methoxypropionitrile, if excess of 2,2′-bipyridyl is added to the solution.
Language eng
DOI 10.1016/j.electacta.2015.08.135
Field of Research 030604 Electrochemistry
Socio Economic Objective 970103 Expanding Knowledge in the Chemical Sciences
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Grant ID CE140100012
Copyright notice ©2015, Elsevier
Persistent URL http://hdl.handle.net/10536/DRO/DU:30078360

Document type: Journal Article
Collection: Institute for Frontier Materials
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Created: Thu, 17 Sep 2015, 15:17:11 EST

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