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The effect of solvent on the seebeck coefficient and thermocell performance of cobalt bipyridyl and iron ferri/ferrocyanide redox couples

journal contribution
posted on 2019-01-01, 00:00 authored by A Taheri, D R MacFarlane, Cristina Pozo-GonzaloCristina Pozo-Gonzalo, Jenny PringleJenny Pringle
© 2019 CSIRO. The conversion of thermal energy to electricity using thermoelectrochemical cells (thermocells) is a developing approach to harvesting waste heat. The performance of a thermocell is highly dependent on the solvent used in the electrolyte, but the interplay of the various solvent effects is not yet well understood. Here, using the redox couples [Co(bpy)3][BF4]2/3 (bpy = 2,2′-bipyridyl) and (Et4N)3/(NH4)4Fe(CN)6, which have been designed to allow dissolution in different solvent systems (aqueous, non-aqueous, and mixed solvent), the effect of solvent on the Seebeck coefficient (Se) and cell performance was studied. The highest Se for a cobalt-based redox couple measured thus far is reported. Different trends in the Seebeck coefficients of the two redox couples as a function of the ratio of organic solvent to water were observed. The cobalt redox couple produced a more positive Se in organic solvent than in water, whereas addition of water to organic solvent resulted in a more negative Se for Fe(CN)63-/4-. UV-vis and IR investigations of the redox couples indicate that Se is affected by changes in solvent-ligand interactions in the different solvent systems.

History

Journal

Australian Journal of Chemistry

Volume

72

Issue

9

Pagination

709 - 716

Publisher

CSIRO Publishing

Location

Melbourne, Vic.

ISSN

0004-9425

eISSN

1445-0038

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2019, CSIRO

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