High N-doped hierarchical porous carbon networks with expanded interlayers for efficient sodium storage
有为有效的钠存储的扩展夹层的高做 N 的层次多孔的碳网络作者机构：School of Envronmental and Chemical EngineeringJiangsu University of Science and TechnologyZhenjiang 212003China School of the Environment and Safety EngineeringJiangsu UniversityZhenjiang 212013China
出 版 物：《Nano Research》 (纳米研究（英文版）)
年 卷 期：2020年第13卷第10期
页 面：2862-2868页
核心收录：
基 金：The work was financially supported by the National Natural Science of Foundation of China(No.51672114) the Natural Science Foundation of Jiangsu Province(No.BK20181469) the Zhenjiang Key Research and Development Project(Social Development)(No.SSH20190140049)
主 题：hierarchical porous carbon networks high N doping expanded interlayer spacing anode sodium-ion batteries
摘 要：Sodium-ion batteries (SIBs) have been attracting considerable attention as a promising candidate for large-scale energy storage because of the abundance and low-cost of sodium resources. However, lack of appropriate anode materials impedes further applications. Herein, a novel self-template strategy is designed to synthesize uniform flowerlike N-doped hierarchical porous carbon networks (NHPCN) with high content of N (15.31 at.%) assembled by ultrathin nanosheets via a self-synthesized single precursor and subsequent thermal annealing. Relying on the synergetic coordination of benzimidazole and 2-methylimidazole with metal ions to produce a flowerlike network, a self-formed single precursor can be harvested. Due to the structural and compositional advantages, including the high N doping, the expanded interlayer spacing, the ultrathin two-dimensional nano-sized subunits, and the three-dimensional porous network structure, these unique NHPCN flowers deliver ultrahigh reversible capacities of 453.7 mAh·g^−1 at 0.1 A·g^−1 and 242.5 mAh·g^−1 at 1 A·g^−1 for 2,500 cycles with exceptional rate capability of 5 A·g^−1 with reversible capacities of 201.2 mAh·g^−1. The greatly improved sodium storage performance of NHPCN confirms the importance of reasonable engineering and synthesis of hierarchical carbon with unique structures.
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