Ionic transportation and chemical stability of high-endurance porous polyethylene separator for vanadium redox flow batteries
| Autor: | Won-Shik Park, Sung-Hee Roh, Ho-Young Jung, Geon-O Moon, Chang-Soo Jin, Hee-Tak Kim, T. Sadhasivam |
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| Rok vydání: | 2018 |
| Předmět: |
Thermogravimetric analysis
Materials science 020209 energy Vanadium chemistry.chemical_element 02 engineering and technology General Chemistry Polyethylene 021001 nanoscience & nanotechnology Condensed Matter Physics Redox chemistry.chemical_compound Membrane chemistry Chemical engineering Nafion 0202 electrical engineering electronic engineering information engineering General Materials Science Chemical stability 0210 nano-technology Separator (electricity) |
| Zdroj: | Solid State Ionics. 327:110-116 |
| ISSN: | 0167-2738 |
| Popis: | To confirm the viability of a porous polyethylene (PE) separator for using in vanadium redox flow batteries (VRFBs), we conduct a comparative electroanalytical and chemical stability studies of the PE separator and Nafion 212 membrane. We characterize the physicochemical properties of the separator, such as water uptake, dimensional change, and ion conductivity, and analyze its structural and compositional features using thermogravimetric analysis, scanning electron microscopy, and X-ray photoelectron spectroscopy. We also test the chemical stability of the separator against highly oxidative V5+ ions and the cell performance of VRFB using PE separator to assess practical applicability. In chemical stability, the change of VO2+ ion to VO2+ ion is considerably lowered by the PE separator (0.01 mmol/L) than the Nafion 212 (0.27 mmol/L), which indicates that the PE separator possesses higher chemical stability. The energy efficiency of the VRFB with the PE separator is lower than that obtained with Nafion 212. However, the chemical stability of PE separator is 27 times higher than that of Nafion 212, indicating that its use will promote the long-term operation of the VRFB system. Hence, the PE separator can be considered a cost-effective option for VRFB operation, with appropriate modifications to its thickness, surface properties and pore structure. |
| Databáze: | OpenAIRE |
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