Designing porous and flexible electrodes with excellent electrochemical properties is crucial to fabricate high-performance flexible supercapacitors. Conductive polymer-based electrospun fibers are expected to be an ideal material for constructing flexible electrodes due to the enormous specific surface area, unique pore structure and inherent flexibility. However, the exploration of such electrospun fibers with facile preparation methods and high areal capacitance remains challenging. Herein, a novel polyetherimide@polyaniline core-shell fibrous membranes (PEI@PANI CFMs) is fabricated via simply coaxial electrospinning and 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS) secondary doping. With the aid of polyetherimide, highly concentrated emeraldine base polyaniline (EB-PANI) can be perfectly wrapped on the surface of fibers without any spinning assistants, ensuring the well-developed pore structures, superior hydrophilicity, good electrical conductivity and outstanding mechanical flexibility. Benefiting from the synergistic effect of structure and constituents, such flexible PEI@PANI CFMs as electrode materials can provide more accessible electrochemical active sites and decrease the ion diffusion resistance. Therefore, the PEI@PANI CFMs present outstanding areal capacitance of 1159.9 mF cm and remarkable energy density of 46.91 μW h cm in the electrodes and symmetric supercapacitors, demonstrating great potential for applications in flexible energy storage field. This fabrication strategy provides a simple and practicable way to manufacture polyaniline-based fibrous membranes for high-performance flexible electrode materials.

中文翻译：

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新型同轴电纺聚醚酰亚胺@聚苯胺核壳纤维膜作为超级电容器独立式柔性电极的构建

设计具有优异电化学性能的多孔柔性电极对于制造高性能柔性超级电容器至关重要。导电聚合物基电纺纤维由于具有巨大的比表面积、独特的孔结构和固有的灵活性，有望成为构建柔性电极的理想材料。然而，探索这种具有简便制备方法和高面积电容的电纺纤维仍然具有挑战性。在此，通过简单的同轴静电纺丝和2-丙烯酰胺-2-甲基-1-丙磺酸（AMPS）二次掺杂制备了一种新型聚醚酰亚胺@聚苯胺核壳纤维膜（PEI@PANI CFM）。借助聚醚酰亚胺，高浓度翠绿亚胺基聚苯胺（EB-PANI）无需任何纺丝助剂即可完美包裹在纤维表面，保证了发达的孔隙结构、优异的亲水性、良好的导电性和突出的机械柔韧性。受益于结构和成分的协同效应，这种柔性PEI@PANI CFM作为电极材料可以提供更容易接近的电化学活性位点并降低离子扩散阻力。因此，PEI@PANI CFM在电极和对称超级电容器中呈现出1159.9 mF·cm的出色面积电容和46.91 μWh·cm的显着能量密度，在柔性储能领域具有巨大的应用潜力。这种制造策略提供了一种简单实用的方法来制造用于高性能柔性电极材料的聚苯胺基纤维膜。