Abstract Ideal electrodes should hold well-defined pore size distribution, high electrical conductivity and superior compatibility. Herein, we present a scalable strategy for the design and generation of macroporous frameworks based on N-doped hollow carbon spheres intercalated graphene film (GNC). In the unique structure, hollow carbon spheres separate the graphene nanosheets and provide convenience for ion entering the film and maximize the ion-accessible surface area. In situ deposition high performance MnO2 on the surface of GNC film can help to enhance the specific capacity of the compounds. The obtained GNC/MnO2 binder-free supercapacitor electrode exhibits ultrahigh volumetric capacitance 532.7 F cm−3 at 2 mV s−1. An asymmetric supercapacitor based on GNC/MnO2//GNC shows an ultrahigh volumetric energy density of 45.9 Wh L−1 at 1024 W L−1, which is much higher than the reported carbon based materials in aqueous electrolytes. The device also shows an excellent cycling stability with 93.1% initial capacitance after 5000 charge/discharge cycles. The device can light two LEDs, which indicates the potential of the composite for practical application.

中文翻译：

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用于超高体积能量密度超级电容器的 N 掺杂空心碳球插入石墨烯薄膜诱导大孔框架

摘要 理想的电极应具有明确的孔径分布、高导电性和优异的兼容性。在此，我们提出了一种基于 N 掺杂的空心碳球插层石墨烯薄膜 (GNC) 的大孔框架设计和生成的可扩展策略。在独特的结构中，空心碳球将石墨烯纳米片隔开，为离子进入薄膜提供便利，并最大化离子可及的表面积。在 GNC 薄膜表面原位沉积高性能 MnO2 有助于提高化合物的比容量。获得的 GNC/MnO2 无粘合剂超级电容器电极在 2 mV s-1 下表现出超高的体积电容 532.7 F cm-3。基于 GNC/MnO2//GNC 的非对称超级电容器在 1024 W L-1 下显示出 45.9 Wh L-1 的超高体积能量密度，这远高于水性电解质中报道的碳基材料。该器件还表现出出色的循环稳定性，在 5000 次充电/放电循环后具有 93.1% 的初始电容。该设备可以点亮两个 LED，这表明该复合材料在实际应用中的潜力。