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High seebeck coefficient in middle-temperature thermocell with deep eutectic solvent.

Naura Fakhira Antariksa1, Teppei Yamada2,3,4, Nobuo Kimizuka1,5

  • 1Division of Applied Chemistry, Graduate School of Engineering, Kyushu University, Motooka 744, Nishi-ku, Fukuoka, 819-0395, Japan.

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Deep eutectic solvents (DES) enhance thermocell performance, achieving a high Seebeck coefficient of -1.67 mV/K for ferricyanide/ferrocyanide redox couples at high temperatures. This breakthrough enables efficient waste-heat recovery applications.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Sustainable Energy

Background:

  • Thermocells are devices that convert thermal energy into electrical energy.
  • Developing efficient thermocells for waste-heat recovery is crucial for energy sustainability.
  • High Seebeck coefficients are essential for maximizing thermocell efficiency.

Purpose of the Study:

  • To investigate the application of deep eutectic solvents (DES) in thermocell electrolytes.
  • To achieve a high Seebeck coefficient (Se) in thermocells operating at high temperatures.
  • To explore the potential of DES-based thermocells for waste-heat recovery.

Main Methods:

  • Utilized a deep eutectic solvent composed of ethylene glycol and choline chloride as the electrolyte.
  • Employed a ferricyanide/ferrocyanide ([Fe(CN)6]3-/4-) redox couple.
  • Measured the Seebeck coefficient (Se) of the thermocell over a wide temperature range.
  • Performed spectroscopic analysis to understand interactions between the redox couple and the DES.

Main Results:

  • Achieved a high Seebeck coefficient (Se) of -1.67 mV/K using the DES electrolyte.
  • Demonstrated stable thermocell operation over a broad temperature range (135-165 °C).
  • Spectroscopic analysis indicated strong interactions between the redox couple and the DES, contributing to the high Se.

Conclusions:

  • Deep eutectic solvents are effective electrolytes for high-temperature thermocells.
  • The developed DES-based thermocell exhibits excellent performance for waste-heat recovery.
  • Strong interactions between DES and redox couples are key to achieving high Seebeck coefficients.