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7007634 
Journal Article 
Flexible Quasi-Solid State Ionogels with Remarkable Seebeck Coefficient and High Thermoelectric Properties 
Cheng, H; He, Xu; Fan, Z; Ouyang, J; , 
2019 
WILEY-V C H VERLAG GMBH 
WEINHEIM 
9 
32 
WOS:000478226800001 
Thermoelectric materials can be used to harvest low-grade heat that is otherwise dissipated to the environment. But the conventional thermoelectric materials that are semiconductors or semimetals, usually exhibit a Seebeck coefficient of much less than 1 mV K-1. They are expensive and consist of toxic elements as well. Here, it is demonstrated environmental benign flexible quasi-solid state ionogels with giant Seebeck coefficient and ultrahigh thermoelectric properties. The ionogels made of ionic liquids and poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) can exhibit a giant Seebeck coefficient up to 26.1 mV K-1, the highest for electronic and ionic conductors. In addition, they have a high ionic conductivity of 6.7 mS cm(-1) and a low thermal conductivity of 0.176 W m(-1) K-1. Their thermoelectric figure of merit (ZT) is thus 0.75. The giant Seebeck coefficient is related to the ion-dipole interaction between PVDF-HFP and ionic liquids. Their application in ionic thermoelectric capacitors is also demonstrated for the conversion of intermittent heat into electricity. They are especially important to harvest the low-grade thermal energy that is abundant on earth. 
ionic conductors; ionic thermoelectric capacitors; ionogels; Seebeck coefficient; thermoelectrics 
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