To prepare highly N‐doped carbon materials (HNCs) as well as to determine the influence of N dopants on Na‐ion storage performance, hexamine‐based metal–organic frameworks are employed as new and efficient precursors in the preparation of HNCs. The HNCs possess reversible capacities as high as 160 and 142 mA h g⁻¹ at 2 A g⁻¹ (≈8 C) and 5 A g⁻¹ (≈20 C), respectively, and maintain values of 145 and 123 mA h g⁻¹ after 500 cycles, thus exhibiting excellent rate and long‐term cyclic performance. Based on systematic analysis, a new insight into the roles of the different N configurations in Na‐ion storage is proposed. The adsorption of Na ions on pyridinic‐N (N‐6) and pyrrolic‐N (N‐5) is fully irreversible, whereas the adsorption on graphitic‐N (N‐Q) is partially reversible and the adsorption on N‐oxide (N‐O) is fully reversible. More importantly, the N‐6/N‐Q ratio is an intrinsic parameter that reflects the relationship between the N configurations and carbon textures for N‐doped carbons prepared from in situ pyrolysis of organic precursors. The cyclic stability and rate‐performance improve with decreasing N‐6/N‐Q ratio. Therefore, this work is of great significance for the design of N‐doped carbon electrodes with high performance for sodium ion batteries.

中文翻译：

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从基于六胺的MOF中定制高氮掺杂的碳材料：卓越的性能和对氮配置在钠离子存储中的作用的新见解

为了制备高度掺杂N的碳材料（HNC）以及确定N掺杂剂对Na离子存储性能的影响，基于六胺的金属有机骨架被用作制备HNC的新型高效前体。所述HNCS具有可逆容量高达160和142毫安汞柱^-1以2A克^-1（≈8C）和5 A G ^-1（≈20℃），分别与保持器145和123毫安汞柱的值^{- 1个}500次循环后，因此具有极好的速率和长期循环性能。在系统分析的基础上，提出了对不同N配置在Na-ion存储中的作用的新见解。Na离子在吡啶N（N-6）和吡咯N（N-5）上的吸附是完全不可逆的，而在石墨N（NQ）上的吸附是部分可逆的，而在N-氧化物（N N-O）是完全可逆的。更重要的是，N-6 / N-Q比是一个内在参数，反映了通过有机前体的原位热解制备的N掺杂碳的N构型与碳织构之间的关系。循环稳定性和速率性能随N-6 / N-Q比的降低而提高。因此，这项工作对于设计钠离子电池高性能N掺杂碳电极具有重要意义。