In this work, the nitrogen and fluorine co-doped graphene hydrogel (NFGH) with three-dimensional (3D) porous structure was prepared through a simple one-step hydrothermal method using graphene oxide and ammonium fluoride. The interconnected 3D skeleton porous structure synthesized by the self-assembly of graphene can effectively inhibit the agglomeration of graphene, which will provide more diffusion paths for the electrolyte ions. Benefiting from the wettability of nitrogen functional groups, the nitrogen doping effectively reduces the hydrophobicity of electrode caused by the doping of fluorine. Due to the 3D porous structure of NFGH and the incorporation of nitrogen and fluorine, the NFGH exhibits excellent supercapacitive performance. The maximum specific capacitance of NFGH electrode is up to 366 F g⁻¹ in the aqueous electrolyte, and 98% capacitance can be maintained even after 10,000 cycles. These excellent supercapacitive performances demonstrate that the NFGH has a great potential for application in high-performance supercapacitors.

中文翻译：

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氮和氟共掺杂石墨烯水凝胶，用于高性能超级电容器

在这项工作中，使用氧化石墨烯和氟化铵通过简单的一步水热法制备了具有三维（3D）多孔结构的氮和氟共掺杂石墨烯水凝胶（NFGH）。通过石墨烯的自组装合成的相互连接的3D骨架多孔结构可以有效地抑制石墨烯的团聚，这将为电解质离子提供更多的扩散路径。得益于氮官能团的可湿性，氮掺杂有效地降低了由氟掺杂引起的电极疏水性。由于NFGH的3D多孔结构以及氮和氟的结合，NFGH表现出出色的超电容性能。NFGH电极的最大比电容高达366 F g ^-1在水性电解质中，即使经过10,000次循环，也可以保持98％的电容。这些出色的超级电容性能表明，NFGH在高性能超级电容器中具有巨大的应用潜力。