N, S-Codoped Hyper-Cross-Linked Polymers Blended with Polyacrylonitrile via Electrospinning as Precursors for...

To address the global energy crisis, supercapacitors─as highly efficient energy storage devices─are emerging as a key technology for solving energy storage and rapid discharge challenges. Porous carbon materials, owing to their high specific surface area and excellent electrochemical stability, have become an ideal choice for supercapacitor electrode materials. However, traditional porous carbon materials are predominantly powder-based, limiting their application in flexible energy storage devices. To address this challenge, electrospinning technology was incorporated into the fabrication process of porous carbon materials. The fabrication process involved electrospinning a blend of polyacrylonitrile and hyper-cross-linked polymers (HCPs) with fiber structure, resulting in nanofiber membranes characterized by a continuous architecture. Following high-temperature carbonization, this nanofiber membrane developed a uniform porous structure and demonstrated outstanding electrochemical performance. Experimental results indicate that the porous carbon nanofiber membrane exhibits optimal specific capacitance performance when the HCPs content is 40 mg, achieving a specific capacitance of 311 F g^-1 at a current density of 0.5 A g^-1. Moreover, it retains 88.7% of its capacitance performance after 10,000 charge-discharge cycles. This porous carbon nanofiber membrane not only eliminates the need for binders required by traditional powder electrode materials but can also be directly used as a flexible electrode, demonstrating significant application potential in the field of flexible energy storage devices.