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Issue 21, 2020
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Quasi-solid state nanoparticle/(ionic liquid) gels with significantly high ionic thermoelectric properties

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Abstract

Ionic conducting materials such as polymer electrolytes and ionic liquids can have a thermovoltage higher than those of electronic thermoelectric materials by several orders of magnitude, while their conductivity is much lower than those of the latter. Hence, their heat-to-electricity conversion efficiency is not high enough for practical application. The heat conversion efficiency of ionic conducting materials depends on the ionic figure of merit (ZTi). Here, we demonstrate quasi-solid state ionogels made of ionic liquids and SiO2 nanoparticles. They can have high thermovoltage and ionic conductivity. The optimal ionic ZTi value can be up to 1.47 with an ionic Seebeck coefficient of 14.8 mV K−1, ionic conductivity of 4.75 × 10−2 S cm−1, thermal conductivity of 0.21 W m−1 K−1 and ionic power factor of 1040.4 μW m−1 K−2 at room temperature. This ZTi value is almost twice the previous highest ZTi value for ionic conductors used for heat-to-electricity conversion in the literature.

Graphical abstract: Quasi-solid state nanoparticle/(ionic liquid) gels with significantly high ionic thermoelectric properties

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Article information


Submitted
16 Apr 2020
Accepted
11 May 2020
First published
12 May 2020

J. Mater. Chem. A, 2020,8, 10813-10821
Article type
Paper

Quasi-solid state nanoparticle/(ionic liquid) gels with significantly high ionic thermoelectric properties

X. He, H. Cheng, S. Yue and J. Ouyang, J. Mater. Chem. A, 2020, 8, 10813
DOI: 10.1039/D0TA04100A

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