Flexible and Robust Bacterial Cellulose-Based Ionogels with High Thermoelectric Properties for Low-Grade Heat Harvesting

Liu Kuankuan; Lv Jingchun; Fan GuodongWang BijiaMao ZhipingSui XiaofengFeng Xueling

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Flexible and Robust Bacterial Cellulose-Based Ionogels with High Thermoelectric Properties for Low-Grade Heat Harvesting

机译：Flexible and Robust Bacterial Cellulose-Based Ionogels with High Thermoelectric Properties for Low-Grade Heat Harvesting

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The utilization of low-grade and abundant thermal sources based on thermoelectric (TE) materials is crucial for the development of a sustainable society. However, high-performance thermoelectric materials with biodegradable, mass-productive, and low-cost features are rarely reported. Here, from the perspective of sustainable development, natural polymer (bacterial cellulose, BC), and "green" solvent (ionic liquids, ILs) are combined to achieve a transparent, flexible, and robust ionogel (BCIGs) by using a facile and versatile modified co-solvent evaporation method. The proposed BCIGs with 95 wt% 1-ethyl-3-methylimidazolium dicyanamide ([EMIm][DCA]) can have high tensile strength (3.05 MPa), skin-like mechanical stretchability (40.99%), and obvious adhesivity. The BCIGs are thermally stable up to 250 degrees C. They also exhibit a high ionic conductivity (2.88 x 10(-2) S cm(-1)), high ionic thermovoltage (18.04 mV K-1), and low thermal conductivity (0.21 W m(-1) K-1), resulting in the great ionic figure of merit (ZT(i)) of 1.33 at room temperature. Through the model of mesoscopic confined ion transportation under a thermal gradient, it is attributed the great thermoelectric properties to the synergistic effect between ion-cellulose interaction and ion-ion interaction. Moreover, a flexible ionic thermoelectric capacitor (ITEC) device is also demonstrated, showing the potential of the BCIGs in wearable energy supply.

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《Advanced functional materials》 |2022年第6期|2107105.1-2107105.12|共12页
作者
Liu Kuankuan; Lv Jingchun; Fan GuodongWang BijiaMao ZhipingSui XiaofengFeng Xueling;
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Donghua Univ, Coll Chem Chem Engn & Biotechnol, Minist Educ, Key Lab Sci & Technol Ecotext, Shanghai 201620, Peoples R China;

Donghua Univ, Coll Chem Chem Engn & Biotechnol, Minist Educ, Key Lab Sci & Technol Ecotext, Shanghai 201620, Peoples R China|Donghua Univ, Natl Engn Res Ctr Dyeing & Finishing Text, Shanghai 201620, Peoples R China;

Donghua Univ, Coll Chem Chem Engn & Biotechnol, Minist Educ, Key Lab Sci & Technol Ecotext, Shanghai 201620, Peoples R China|Donghua Univ, Natl Engn Res Ctr Dyeing & Finishing Text, Shanghai 201620, Peoples R China|Natl Mfg Innovat Ctr Adv Dyeing & Finish;

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ionogels; mesoscopic confinement; robust ionogels; Soret effect; thermoelectrics;

Flexible and Robust Bacterial Cellulose-Based Ionogels with High Thermoelectric Properties for Low-Grade Heat Harvesting

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