Capacitive-faradaic fuel cells (CFFCs) for ion separation: Macro-scale configurations and polarization mechanism
| Autor: | Youri Gendel, Gidon Amikam |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Capacitive deionization Capacitive sensing chemistry.chemical_element 02 engineering and technology 010402 general chemistry 01 natural sciences Ion lcsh:Chemistry Adsorption Electrochemistry medicine CFFC Polarization (electrochemistry) Desalination fuel cell Mixed potential Capacitive-faradaic fuel cells 021001 nanoscience & nanotechnology 0104 chemical sciences Chemical engineering chemistry lcsh:Industrial electrochemistry lcsh:QD1-999 Electrode 0210 nano-technology Carbon Activated carbon medicine.drug lcsh:TP250-261 |
| Zdroj: | Electrochemistry Communications, Vol 124, Iss, Pp 106945-(2021) |
| ISSN: | 1388-2481 |
| Popis: | The polarization mechanism of capacitive-faradaic fuel cells is reported. The mixed potentials of faradaic (Pt and Ti/Pt-IrO2) and capacitive (activated carbon powder and fleece) electrodes were measured in aerated and hydrogenated NaCl solutions at various pH values. Next, two configurations featuring divided and undivided macro-scale CFFCs were investigated: (i) a system with two fixed electrodes made of Ti/Pt-IrO2 and activated carbon fleece, and (ii) a CFFC with one fixed Ti/Pt-IrO2 electrode and one flowing carbon electrode. The salt adsorption capacities obtained in both systems were low compared to conventional capacitive deionization, and therefore optimization of materials and cell architecture is needed. The behaviour of pH and Cl−, SO42− anions conforms to the proposed capacitive-faradaic mechanism, but that of NH4+ and Na+ cations contradicts it. This phenomenon is attributed to faradaic processes and the competitive adsorption–desorption of H+ and OH− ions, which require further detailed investigation. |
| Databáze: | OpenAIRE |
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