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Issue 51, 2020
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Enhanced Seebeck coefficients of thermocells by heat-induced deposition of I3/hydrophobized α-cyclodextrin complexes on electrodes

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Abstract

Ethylated α-cyclodextrin (Et18-α-CD) is used as a host matrix for I/I3 thermocells. Although Et18-α-CD is not soluble in water at ambient temperature, it becomes soluble by complexation of the I3 anion. Meanwhile, the complex is precipitated upon elevating the temperature. The change in thermo-responsive solubility of the I3/Et18-α-CD complex increases the Seebeck coefficient (Se) of the thermocell up to 2.6 mV K−1. The underlying mechanism of the increased Se is elucidated by UV-vis spectroscopy, Raman spectroscopy, and electrochemical measurements. This result shows the temperature-dependent solubility changes of redox-active species as a potential means to improve the performance of electrochemical thermocells.

Graphical abstract: Enhanced Seebeck coefficients of thermocells by heat-induced deposition of I3−/hydrophobized α-cyclodextrin complexes on electrodes

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Article information


Submitted
01 Apr 2020
Accepted
12 May 2020
First published
13 May 2020

Chem. Commun., 2020,56, 7013-7016
Article type
Communication

Enhanced Seebeck coefficients of thermocells by heat-induced deposition of I3/hydrophobized α-cyclodextrin complexes on electrodes

H. Inoue, Y. Liang, T. Yamada and N. Kimizuka, Chem. Commun., 2020, 56, 7013
DOI: 10.1039/D0CC02356F

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