Journal of Electronic Materials

, Volume 47, Issue 6, pp 3193–3197 | Cite as

Thermoelectric Generators Based on Ionic Liquids

  • Edith LauxEmail author
  • Stefanie Uhl
  • Laure Jeandupeux
  • Pilar Pérez López
  • Pauline Sanglard
  • Ennio Vanoli
  • Roger Marti
  • Herbert Keppner
Open Access
Topical Collection: International Conference on Thermoelectrics 2017
Part of the following topical collections:
  1. International Conference on Thermoelectrics 2017


Looking at energy harvesting using body or waste heat for portable electronic or on-board devices, Ionic liquids are interesting candidates as thermoactive materials in thermoelectric generators (TEGs) because of their outstanding properties. Two different kinds of ionic liquid, with alkylammonium and choline as cations, were studied, whereby different anions and redox couples were combined. This study focussed on the intention to find non-hazardous and environmentally friendly ionic liquids for TEGs to be selected among the thousands that can potentially be used. Seebeck coefficients (SEs) as high as − 15 mV/K were measured, in a particular case for an electrode temperature difference of 20 K. The bottleneck of our TEG device is still the abundance of negative SE liquids matching the internal resistance with the existing positive SE-liquids at series connections. In this paper, we show further progress in finding increased negative SE liquids. For current extraction from the TEG, the ionic liquid must be blended with a redox couple, allowing carrier exchange in a cyclic process under a voltage which is incuced by the asymmetry of the generator in terms of hot and cold electrodes. In our study, two types of redox pairs were tested. It was observed that a high SE of an ionic liquid/redox blend is not a sufficient condition for high power output. It appears that more complex effects between the ionic liquid and the electrode determine the magnitude of the final current/power output. The physico-chemical understanding of such a TEG cell is not yet available.


Ionic liquid thermoelectric generator environmentally friendly energy harvesting body/waste heat Seebeck coefficient 



The authors acknowledge the financial support of the Haute Ecole Spécialisée de Suisse occidentale, HES-SO Interdisciplinary Project No. 011-2015-PI and the European Union’s Horizon 2020 research and innovation programme under Grant Agreement No. 731976”. H2020-FETPROACT Grant No. 731976 Magenta.


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© The Author(s) 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (, which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

Authors and Affiliations

  1. 1.Haute Ecole Arc Ingénierie (HES-SO)La Chaux-de-FondsSwitzerland
  2. 2.Haute école d’ingénierie et d’architecture (HES-SO)FribourgSwitzerland

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