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A liquid thermoelectric device composed of organic solution

The liquid thermoelectric device (LTE) exhibits a very simple structure that consists of hot/cold electrodes of identical type and a solution with a redox couple. Here, we evaluated the performances of LTE composed of acetone (or acetonitrile) solutions of Fe(ClO4)2/Fe(ClO4)3 against their concentration (m). The electrochemical Seebeck coefficients (α) of organic LTE range from 1.5 to 2.5 mV K−1 and are higher than α (=1.4 mV K−1) of the corresponding aqueous LTE. The dimensionless figure of merit (ZT) of organic LTE is ≈0.015 at maximum and is higher than the maximum ZT (=0.009) of the corresponding aqueous LTE. Thus, the organic LTE is promising as an energy harvesting device.