Hybrid thermoelectrochemical and concentration cells for harvesting low-grade waste heat
| Autor: | Hochun Lee, Junsik Kang, Kyunggu Kim |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Aqueous solution business.industry General Chemical Engineering Energy conversion efficiency Analytical chemistry General Chemistry Industrial and Manufacturing Engineering Concentration cell symbols.namesake chemistry.chemical_compound chemistry Seebeck coefficient Waste heat symbols Environmental Chemistry Dimethyl carbonate Carnot cycle business Thermal energy |
| Zdroj: | Chemical Engineering Journal. 426:131797 |
| ISSN: | 1385-8947 |
| DOI: | 10.1016/j.cej.2021.131797 |
| Popis: | Thermoelectrochemical cells (TECs) are promising platforms for thermal energy conversion. However, their widespread use is limited because of their low Seebeck coefficient and low conversion efficiency. We demonstrate a hybrid thermoelectrochemical and concentration cell based on carbonate solvents with a I3−/I− redox couple (referred to as i-TCC), which outperforms the current best n-type TEC employing an aqueous Fe3+/2+ redox couple. As the temperature of the hot side of i-TCC increases above 40 °C, dimethyl carbonate solvent reacts with iodide anions to form a porous Li2CO3-matrix near the hot electrode, which sustains long-lasting iodide-concentration gradient across the cell. The thermally driven concentration difference boosts the performance of the TEC to yield a remarkably high Seebeck coefficient (+7.7 mV K−1), figure of merit (ZT = 0.114), and Carnot efficiency (5.2%) for a temperature difference of 35 °C (25 °C and 60 °C for cold and hot temperatures, respectively). i-TCC demonstrated here thus provides a new perspective in harvesting low-grade waste heat. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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