Intercalated flexible electrodes for energy storage devices have drawn significant research interests as they can provide high energy densities for powering electronics without sacrificing the overall flexibility. Herein, we report an intercalated reduced graphene oxide/polyacrylonitrile (rGO/PAN) flexible supercapacitor electrode fabricated via a layer-by-layer wet electrospinning (LLwES) process with diluted graphene oxide (GO) solution as the coagulation liquid and subsequent thermal reduction treatment. It was observed that a thin GO film was established on individual PAN nanofiber layer after the wet electrospinning process, while the subsequent thermal reduction of GO led to simultaneous stabilization of the PAN fibers and the creation of an interesting three-dimensional hierarchical carbon nanostructure suitable for flexible, high-performance electrochemical capacitor (EC) electrodes. The formation of gases during the thermal treatment expanded the electrospun PAN fiber layers and resulted in the formation of intercalated nitrogen-doped porosities. The resulting LLwES rGO/PAN system, thermally treated in a nitrogen atmosphere, demonstrated exceptional double-layer capacitance of 221 F/g at 10 mV/s, a controllable electrical conductivity of 125 S/m, and a stable cycling performance retaining a slightly increased capacitance after 10000 cycles.

中文翻译：

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柔性插入式超级电容器电极的分层结构氮掺杂多层还原氧化石墨烯

用于储能装置的插入式柔性电极已经引起了广泛的研究兴趣，因为它们可以在不牺牲整体灵活性的情况下为电子设备供电提供高能量密度。在本文中，我们报告了通过以稀释的氧化石墨烯（GO）溶液作为凝结液并随后进行热还原处理的逐层湿式静电纺丝（LLwES）工艺制造的插层还原氧化石墨烯/聚丙烯腈（rGO / PAN）柔性超级电容器电极。观察到，在湿电纺丝工艺之后，在单个PAN纳米纤维层上形成了薄的GO膜，而随后的GO热还原导致PAN纤维同时稳定，并产生了一个有趣的三维分层碳纳米结构，适用于灵活，高性能电化学电容器（EC）电极。热处理过程中的气体形成使电纺PAN纤维层膨胀，并导致插层的氮掺杂孔隙形成。所得的LLwES rGO / PAN系统在氮气氛中进行了热处理，在10 mV / s的条件下表现出出色的221 F / g双层电容，可控的125 S / m的电导率以及稳定的循环性能10000次循环后电容增加。