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首页> 外文期刊>RSC Advances >Constructing nitrogen-doped nanoporous carbon/graphene networks as promising electrode materials for supercapacitive energy storage
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Constructing nitrogen-doped nanoporous carbon/graphene networks as promising electrode materials for supercapacitive energy storage

机译：构建氮掺杂的纳米多孔碳/石墨烯网络作为有希望的超级电容储能电极材料

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摘要

Nitrogen-doped nanoporous carbon/graphene networks (NPC/G) have been prepared by zeolitic imidazolate frameworks (ZIF-8) homogeneously encapsulated in graphene oxide (GO) networks, which were carbonized at high-temperature under a N-2 atmosphere and washed to get rid of impurities. The obtained NPC/G composites are highly graphitizing and exhibit a high specific surface area up to 703 m(2) g(-1). By optimizing the annealing conditions, the nanoporous frameworks derived from ZIF-8 can be effectively maintained, which are beneficial for electrolyte ion adsorption and transportation. Furthermore, the NPC/G composites are used as electrode materials for supercapacitive energy storage and show a high specific capacitance of 235 F g(-1) at a current density of 1 A g(-1), which is larger than that of NPCs and rGO. This provides a new route for designing novel structures to improve electrochemical performance. More interestingly, these electrode materials also present excellent rate capability and 85% retention of its initial capacitance after 1000 cycles in 1 M KOH aqueous solution.
机译：氮掺杂的纳米多孔碳/石墨烯网络（NPC / G）是通过均质封装在氧化石墨烯（GO）网络中的沸石咪唑酸酯骨架（ZIF-8）制备的，并在N-2气氛下于高温下碳化并洗涤去除杂质。获得的NPC / G复合材料具有很高的石墨化性，并具有高达703 m（2）g（-1）的高比表面积。通过优化退火条件，可以有效维持ZIF-8衍生的纳米孔骨架，有利于电解质离子的吸附和运输。此外，NPC / G复合材料被用作超级电容储能的电极材料，并在1 A g（-1）的电流密度下显示出235 F g（-1）的高比电容，该电容比NPC大和rGO。这提供了设计新颖结构以改善电化学性能的新途径。更有趣的是，这些电极材料在1 M KOH水溶液中经过1000次循环后，还具有出色的速率能力和其初始电容的85％保留率。

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