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Enhanced Thermoelectric Power in Ionic Liquids

Authors

  • Dr. Veronika Zinovyeva,

    1. IRAMIS, Service de Physique de l'Etat Condensé, Commissariat à l'Energie Atomique et aux Energies Alternatives, CEA Saclay, 91191 Gif sur Yvette Cedex (France)
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  • Dr. Sawako Nakamae,

    1. IRAMIS, Service de Physique de l'Etat Condensé, Commissariat à l'Energie Atomique et aux Energies Alternatives, CEA Saclay, 91191 Gif sur Yvette Cedex (France)
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  • Dr. Marco Bonetti,

    1. IRAMIS, Service de Physique de l'Etat Condensé, Commissariat à l'Energie Atomique et aux Energies Alternatives, CEA Saclay, 91191 Gif sur Yvette Cedex (France)
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  • Prof. Michel Roger

    Corresponding author
    1. IRAMIS, Service de Physique de l'Etat Condensé, Commissariat à l'Energie Atomique et aux Energies Alternatives, CEA Saclay, 91191 Gif sur Yvette Cedex (France)
    • IRAMIS, Service de Physique de l'Etat Condensé, Commissariat à l'Energie Atomique et aux Energies Alternatives, CEA Saclay, 91191 Gif sur Yvette Cedex (France)

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Abstract

The thiolate/disulfide organic redox couple (McMT/BMT), derived from 2-mercapto-5-methyl-1,3,4-thiadiazole (McMT), recently proposed as an alternative to usual inorganic couples in dye-sensitized solar cells, exhibits a remarkable reversibility and stability in a thermogalvanic cell containing a 1-ethyl-3-methyimidazolium tetrafluoroborate/acetonitrile (EMIMBF4/AN) mixture. The thermoelectric power depends strongly on concentrations of both the ionic liquid and the redox couple. It is enhanced by a factor of six at high ionic-liquid concentrations. The control of these parameters can be used to enhance the thermopower and the thermoelectric efficiency of future ionic-liquid thermocells.

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