Significant Enhancement in the Thermoelectric Properties of Ionogels through Solid Network Engineering

Liu Zhuo; Cheng Hanlin; He HaoLi JianboOuyang Jianyong

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Significant Enhancement in the Thermoelectric Properties of Ionogels through Solid Network Engineering

机译：Significant Enhancement in the Thermoelectric Properties of Ionogels through Solid Network Engineering

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Thermoelectric (TE) materials are significant for sustainable development because they can be used to directly harvest heat into electricity. Recently, ionic TE materials emerged as very promising materials mainly due to their high thermovoltage that can be higher than the Seebeck coefficient of electronic TE materials by 2-3 orders in magnitude. However, their conductivity is very low. Here, the significant improvement in the ionic conductivity and thus the overall TE properties of ionogels is reported by engineering their solid networks, which immobilize the ionic liquid in the ionogels. An antisolvent of poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) is added into the acetone solution of 1-ethyl-3-methylimidazolium dicyanamide (EMIM:DCA) that is an ionic liquid and PVDF-HFP prior to the ionogel formation. This can significantly change the solid networks formed by PVDF-HFP and thus the microstructure of the EMIM:DCA/PVDF-HFP ionogels, thereby facilitating ionic transport. As a result, the ionic conductivity of the ionogels can be increased from 7.0 to 17.6 mS cm(-1). The ionogels can exhibit a high ionic figure of merit (ZT(i)) of 1.8 with the ionic Seebeck coefficient of 25.4 mV K-1 and the thermal conductivity of 0.190 W m(-1) K-1. This is the highest recorded ZT(i) value for ionic conductors.

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来源
《Advanced functional materials》 |2022年第7期|2109772.1-2109772.9|共9页
作者
Liu Zhuo; Cheng Hanlin; He HaoLi JianboOuyang Jianyong;
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作者单位

Natl Univ Singapore, Dept Mat Sci & Engn, Singapore 117574, Singapore|Natl Univ Singapore, Suzhou Res Inst, 377 Linquan St,Suzhou Ind Pk, Suzhou 215123, Jiangsu, Peoples R China;

Natl Univ Singapore, Dept Mat Sci & Engn, Singapore 117574, Singapore|Chongqing Univ, Minist Educ PRC, Key Lab Low Grade Energy Utilizat Technol & Syst, 174 Shazheng Main St, Chongqing 400044, Peoples R China;

Natl Univ Singapore, Dept Mat Sci & Engn, Singapore 117574, SingaporeChongqing Univ, Minist Educ PRC, Key Lab Low Grade Energy Utilizat Technol & Syst, 174 Shazheng Main St, Chongqing 400044, Peoples R China;

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正文语种英语
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antisolvent; ionic conductivity; ionic thermoelectrics; ionogels; thermovoltage;

Significant Enhancement in the Thermoelectric Properties of Ionogels through Solid Network Engineering

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