4.6 Article

A magnetic ionic liquid redox couple for harvesting waste heat and mechanical energy

Journal

CHEMICAL PHYSICS LETTERS
Volume 776, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.cplett.2021.138663

Keywords

Thermoelectrochemical; Ionic liquid; Paramagnetic; Energy conversion

Funding

  1. JST, PRESTO [JPMJPR17R1]
  2. NEDO, Japan

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The thermo-electrochemical cell based on magnetic ionic liquids shows high ion conductivity and controllable diffusion under a magnetic field. Touching a magnet to the electrode generates a potential difference, suggesting new possibilities for harvesting both thermal and mechanical energies simultaneously.
This study reports a thermo-electrochemical cell based on ionic liquids 1-buty1-3-methylimidazolium chloride center dot FeCl3 and 1-buty1-3-methylimidazolium chloride center dot FeCl2. This system showed a high ion conductivity of ca.7 S m(-1) the oxidized form of 1-buty1-3-methylimidazolium chloride center dot FeCl3 is paramagnetic, the diffusion was controllable under a magnetic field. When a magnet was touched to one of the electrodes of the thermo-electrochemical cell, a potential difference of several mV was generated. The unique properties of the magnetic ionic liquid redox couple suggest new possibilities for simultaneously harvesting thermal and mechanical energies. , a low charge transfer resistance of 0.9 epsilon cm(2) on a Pt electrode, and a thermopower of 0.26 mV K-1. Because the oxidized form of 1-buty1-3-methylimidazolium chloride center dot FeCl3 is paramagnetic, the diffusion was controllable under a magnetic field. When a magnet was touched to one of the electrodes of the thermo-electrochemical cell, a potential difference of several mV was generated. The unique properties of the magnetic ionic liquid redox couple suggest new possibilities for simultaneously harvesting thermal and mechanical energies.

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