[17a-Z24-1~9] 12.3 Functional Materials and Novel Devices

▲ [17a-Z24-5] A Magnetic Ionic Liquid Redox Couple for Harvesting Waste Heat and Mechanical Energy

〇Qingshuo Wei^1,2,3, Jiang lixian², Shohei Horike^1,3, Masakzu Mukaida^1,2, Kazuhiro Kirihara^1,2 (1.AIST, 2.OPERANDO-OIL, 3.JST PRESTO)

Keywords:Thermoelectric, Thermocells

We will report a thermo-electrochemical cell based on ionic liquids 1-buty1-3-methylimidazolium chloride-FeCl₃ and 1-buty1-3-methylimidazolium chloride-FeCl₂. This system showed a high ion conductivity of ca.7 mS cm⁻¹, a low charge transfer resistance of 9 ohm cm² on a Pt electrode, and a thermopower of 0.26 mV K⁻¹. Because the oxidized form of 1-buty1-3-methylimidazolium chloride·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 by electrostatic induction. The unique properties of the magnetic ionic liquid redox couple suggest new possibilities for simultaneously harvesting thermal and mechanical energies.