Developing a simple strategy to simultaneously overcome the aggregation of graphene nanosheets and endow the ordered mesoporous carbon with the high conductivity required for a practical supercapacitor remains a great challenge. Herein, a strategy involving ethanol dispersive mixing, followed by co-carbonization was developed to prepare a N-doped ordered mesoporous carbon nanosphere-encapsulated graphene network (N-OMCN@GN), where the ordered mesoporous carbon nanosphere (OMCN) was inserted into the interlayers of graphene nanosheets and an optimized nitrogen doping level of up to 11.7 at% was simultaneously achieved. The as-prepared N-OMCN@GN possesses hierarchically porous architectures with largely accessible surfaces, short ion access/diffusion length with fast ion transfer, and a sphere (electron reservoir)-encapsulated plane (electron highway) configuration for convenient electron transfer. As a result, the N-OMCN@GN supercapacitor exhibited a high specific capacitance of 242.3 F g⁻¹ at 1 A g⁻¹ and excellent cycling stability with a capacitance retention of 95% at 5 A g⁻¹ after 10 000 cycles. This study would pave the way to excavate the synergistic effects of graphene and OMCN for energy storage applications.

中文翻译：

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有序介孔碳纳米球包裹的石墨烯网络，具有优化的氮掺杂，可增强超级电容器的性能†

开发一种简单的策略来同时克服石墨烯纳米片的聚集并赋予有序介孔碳以实用的超级电容器所需的高导电性仍然是一个巨大的挑战。本文中，开发了一种涉及乙醇分散混合，随后共碳化的策略，以制备N掺杂有序介孔碳纳米球包裹的石墨烯网络（N-OMCN @ GN），将有序介孔碳纳米球（OMCN）插入其中同时获得了石墨烯纳米片的中间层，并实现了高达11.7 at％的优化氮掺杂水平。所制备的N-OMCN @ GN具有层次结构多孔的结构，具有易于访问的表面，较短的离子进入/扩散长度以及快速的离子转移功能，球形（电子储存器）封装的平面（电子高速公路）配置可方便地进行电子传输。结果，N-OMCN @ GN超级电容器显示出242.3 F g的高比电容^-1 1 A G ^-1和优异的循环稳定性以5A克的95％的电容保持^-1 10 000次循环之后。这项研究将为挖掘石墨烯和OMCN在储能应用中的协同效应铺平道路。