Relatively high-seebeck thermoelectric cells containing ionic liquids supplemented by cobalt redox couple

Sosnowska, Anita (Faculty of Applied Physics and Mathematics, Gdansk University of Technology, Gdansk, Poland) ; Laux, Edith (School of Engineering – HE-Arc Ingénierie, HES-SO // University of Applied Sciences Western Switzerland) ; Keppner, Herbert (School of Engineering – HE-Arc Ingénierie, HES-SO // University of Applied Sciences Western Switzerland) ; Puzyn, Tomasz (Faculty of Applied Physics and Mathematics, Gdansk University of Technology, Gdansk, Poland ; Laboratory of Environmental Chemometrics, Department of Chemistry, University of Gdansk, Gdansk, Poland) ; Bobrowski, Maciej (Faculty of Applied Physics and Mathematics, Gdansk University of Technology, Gdansk, Poland)

Meanwhile no general and reliable equation determining the Seebeck coefficient (Se) and involving electro-chemical reaction effects was derived for solutions. We reported the database of 15,000 ionic liquids supplemented by three different redox couple systems: 0.01 mol/l Co3+/2+ (bpy)3, 0.01 mol/l I3−/3I− and 0.2 mol/l I3−/3I−, and the corresponding estimated Seebeck coefficients. We also reported methods for estimating Seebeck coefficients for those systems. First, Seebeck coefficients were measured for 17 ionic liquids and the 3 redox couples independently, and afterwards an analytical QSPR equation was derived after which the Seebeck coefficients for all possible combinations of cations and anions (resulting in 15,000 conceivable ionic liquid compounds) were derived. Following this, we analyzed the data and discovered tendencies and regularities. It was revealed that small, symmetrical and not branched cations and anions which contained less electronegative atoms, made the Seebeck increased. The highest Se = 2.3 mV/K, was observed for small ammonium and phosphonium cations with a triethyl-n-hexylboride anion. We also discovered that for thermo-electric applications cobalt-based redox couples are much better than the ones based on the iodine/iodide system.


Article Type:
scientifique
Faculty:
Ingénierie et Architecture
School:
HE-Arc Ingénierie
Institute:
Aucun institut
Date:
2020-07
Pagination:
11 p.
Published in:
Journal of Molecular Liquids
Numeration (vol. no.):
2020, vol. 316, article no. 113871
DOI:
ISSN:
0167-7322
Appears in Collection:

Note: The status of this file is: restricted


 Record created 2020-08-18, last modified 2020-10-27

Fulltext:
Download fulltext
PDF

Rate this document:

Rate this document:
1
2
3
 
(Not yet reviewed)