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Enhanced thermal energy harvesting performance of a cobalt redox couple in ionic liquid-solvent mixtures

Lazar, Manoj A., Al-Masri, Danah, Macfarlane, Douglas R. and Pringle, Jennifer M. 2016, Enhanced thermal energy harvesting performance of a cobalt redox couple in ionic liquid-solvent mixtures, Physical chemistry chemical physics, vol. 18, no. 3, pp. 1404-1410, doi: 10.1039/c5cp04305k.

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Title Enhanced thermal energy harvesting performance of a cobalt redox couple in ionic liquid-solvent mixtures
Author(s) Lazar, Manoj A.
Al-Masri, Danah
Macfarlane, Douglas R.
Pringle, Jennifer M.ORCID iD for Pringle, Jennifer M. orcid.org/0000-0002-2729-2838
Journal name Physical chemistry chemical physics
Volume number 18
Issue number 3
Start page 1404
End page 1410
Total pages 7
Publisher Royal Society of Chemistry
Place of publication [London, Eng.]
Publication date 2016-01-21
ISSN 1463-9076
Keyword(s) thermal energy
redox couple
ionic liquid–solvent
Summary Thermoelectrochemical cells are increasingly promising devices for harvesting waste heat, offering an alternative to the traditional semiconductor-based design. Advancement of these devices relies on new redox couple/electrolyte systems and an understanding of the interplay between the different factors that dictate device performance. The Seebeck coefficient (Se) of the redox couple in the electrolyte gives the potential difference achievable for a given temperature gradient across the device. Prior work has shown that a cobalt bipyridyl redox couple in ionic liquids (ILs) displays high Seebeck coefficients, but the thermoelectrochemical cell performance was limited by mass transport. Here we present the Se and thermoelectrochemical power generation performance of the cobalt couple in novel mixed IL/molecular solvent electrolyte systems. The highest power density of 880 mW m-2, at a ΔT of 70 °C, was achieved with a 31 (v/v) MPN-[C2mim][B(CN)4] electrolyte combination. The significant power enhancement compared to the single solvent or IL systems results from a combination of superior ionic conductivity and higher diffusion coefficients, shown by electrochemical analysis of the different electrolytes. This is the highest power output achieved to-date for a thermoelectrochemical cell utilising a high boiling point redox electrolyte.
Language eng
DOI 10.1039/c5cp04305k
Field of Research 030304 Physical Chemistry of Materials
091205 Functional Materials
Socio Economic Objective 970102 Expanding Knowledge in the Physical Sciences
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Grant ID CE140100012
Copyright notice ©2016, the Owner Societies
Persistent URL http://hdl.handle.net/10536/DRO/DU:30081007

Document type: Journal Article
Collection: Institute for Frontier Materials
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Created: Fri, 29 Jan 2016, 06:30:28 EST

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