Ionic thermoelectrics: principles, materials and applications
| Autor: | Yinling Zhao, Qi Qian, Zhuo Liu, Hanlin Cheng, Jianyong Ouyang, Qiujian Le |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Journal of Materials Chemistry C. 10:433-450 |
| ISSN: | 2050-7534 2050-7526 |
| DOI: | 10.1039/d1tc05242j |
| Popis: | Abundant heat is generated in household, industry and natural processes, and the majority of the heat is dissipated to environment as waste heat owing to the low heat utilization efficiency. Hence, to harvest waste heat is of great significance for the sustainable development. Among the heat-harvesting technologies including organic Rankine cycles, thermo-osmotic energy conversion and thermoelectric generators (TEGs), TEGs that can directly convert heat into electricity is the only feasible technology to harvest the low-grade heat that has a temperature below 200 oC and is about 2/3 of the total waste heat. The operational principle of TEGs is the Seebeck effect of electronic thermoelectric (TE) materials such as semiconductors or semimetals. Recently, ionic conductors, such as liquid ionic conductors and gel ionic conductors, emerged as the next-generation TE materials mainly due to their high thermopower. Their thermopower can be higher than that of the electronic TE materials by 2-3 orders in magnitude. In addition, they usually have a low thermal conductivity. Because the charge carriers in ionic conductors are cations and anions, the principle for the ionic thermopower and ionic TE conversion devices are notably different from the electronic counterparts. Very exciting progress has been made on the ionic TE materials and devices. This article provides a review on the ionic TE materials, including the thermopower mechanism, TE properties, and applications. |
| Databáze: | OpenAIRE |
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