Facile Fabrication of Polyaniline Films with Hierarchical Porous Networks for Enhanced Electrochemical Activity
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초록
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A conducting polymer with well-defined porous structures would be preferred as an electrode of a capacitor. Upon crosslinking with phytic acid, polyaniline (PANI) forms a hydrogel with a 3-D porous structure. In this study, we checked the effect on its pore morphology and electrical property of PANI with various compositions. It turns out that the composition in preparation has a significant influence on the morphology of the PANI hydrogel. As ratio of initiator/crosslinker increase or monomer decreases, the PANI hydrogel has denser morphology with decreased pore size and high volumetric surface area, resulting in higher conductivity. So, in the 3-electrode system, the PANI hydrogel electrode prepared at optimized compositions exhibited 105.6 F/cm3 of capacitance with ~50% retention rate after 5000cycles. Finally, we fabricated a practical capacitor with two symmetric PANI hydrogel electrodes, which shows 271.4 F/cm3 of capacitance with improved cycle stability of 80% retention rate.