Thermoelectric Power of Ion Exchange Membrane Cells Relevant to Reverse Electrodialysis Plants
| Autor: | Signe Kjelstrup, Kim R. Kristiansen, V. María Barragán |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Ion exchange Termodinámica Analytical chemistry General Physics and Astronomy 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Temperature gradient Membrane Reversed electrodialysis Seebeck coefficient 0103 physical sciences Thermoelectric effect Ion-exchange membranes 010306 general physics 0210 nano-technology Polarization (electrochemistry) |
| Zdroj: | E-Prints Complutense: Archivo Institucional de la UCM Universidad Complutense de Madrid E-Prints Complutense. Archivo Institucional de la UCM instname Physical Review Applied |
| Popis: | A thermoelectric cell is designed and experiments are carried out in order to measure Seebeck coefficients of ion exchange membranes at different constant concentrations of NaCl in water. The purpose of the investigation is to explore how a temperature gradient may be applied to increase the efficiency of saline power plants, in particular, of the process of reverse electrodialysis (RED). To evaluate measurements and RED applications, we derive an expression for the thermoelectric potential for a cell with a single membrane and for a RED unit cell. The Seebeck coefficient is interpreted in terms of the Peltier heat of the cell, and further expressed in terms of transported entropies. We find the Seebeck coefficient of the cell, after correcting for temperature polarization, by gradually increasing the membrane thickness. The contribution to the Seebeck coefficient from the membrane varied between 1.41 and 0.98 mV/K in FUMASEP FKS-PET-75 cation exchange membranes, and between 0.56 and 0.48 mV/K in FUMASEP FAD-PET-75 anion exchange membranes. The precision in the results is 1%, for NaCl concentrations between 0.03 and 0.60 mol/kg. Measurements on the RED unit cell with water samples taken from realistic fresh- and salt-water sources confirmed that a temperature difference has a significant effect, increasing the emf by 1.3% per kelvin of temperature difference. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. |
| Databáze: | OpenAIRE |
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