Flexible poly(vinyl alcohol)-ceramic composite separators for supercapacitor applications
| Autor: | Kwang Se Lee, Sang Jun Kim, Phiri Isheunesu, Mwemezi Manasi, Latifatu Mohammed, Chris Yeajoon Bon, Jang Myoun Ko |
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| Rok vydání: | 2018 |
| Předmět: |
Supercapacitor
Tear resistance Vinyl alcohol Materials science General Chemical Engineering Composite number Nanoparticle 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences chemistry.chemical_compound chemistry Chemical engineering visual_art Titanium dioxide visual_art.visual_art_medium Ionic conductivity Ceramic 0210 nano-technology |
| Zdroj: | Journal of Industrial and Engineering Chemistry. 68:173-179 |
| ISSN: | 1226-086X |
| Popis: | Electrochemical characterization was conducted on poly(vinyl alcohol) (PVA)-ceramic composite (PVA–CC) separators for supercapacitor applications. The PVA–CC separators were fabricated by mixing various ceramic particles including aluminum oxide (Al2O3), silicon dioxide (SiO2), and titanium dioxide (TiO2) into a PVA aqueous solution. These ceramic particles help to create amorphous regions in the crystalline structure of the polymer matrix to increase the ionic conductivity of PVA. Supercapacitors were assembled using PVA–CC separators with symmetric activated carbon electrodes and electrochemical characterization showed enhanced specific capacitance, rate capability, cycle life, and ionic conductivity. Supercapacitors using the PVA–TiO2 composite separator showed particularly good electrochemical performance with a 14.4% specific capacitance increase over supercapacitors using the bare PVA separator after 1000 cycles. With regards to safety, PVA becomes plasticized when immersed in 6 M KOH aqueous solution, thus there was no appreciable loss in tear resistance when the ceramic particles were added to PVA. Thus, the enhanced electrochemical properties can be attained without reduction in safety making the addition of ceramic nanoparticles to PVA separators a cost-effective strategy for increasing the ionic conductivity of separator materials for supercapacitor applications. |
| Databáze: | OpenAIRE |
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