Abstract

A comprehensive study of nitrogen doped carbon nanotubes (N–CNTs) with nitrogen content varying from 0 at.% to 7.3 at.% is reported. A correlation is revealed between the content of pyridine-like nitrogen and the defectivity of the N–CNT bamboo-like structure. A model of graphene layer with defects containing ordered carbon vacancies and pyridine nitrogen is proposed. The model is based on a combination of experimental data obtained by powder X-ray diffraction, X-ray photoelectron spectroscopy, Raman spectroscopy, scanning electron microscopy and simulation of the N–CNT structure by the use of g-C₃N₄ structural elements. It is shown that more than a two-fold increase of the N–CNT specific capacity in acidic and alkaline electrolytes compared to that of undoped carbon nanotubes is due to the fact that N–CNTs posses significantly better hydrophilic properties due to the defects based on pyridine-like nitrogen centers. The N–CNT efficiency as a catalyst and a palladium catalyst support in the reaction of oxidative desulfurization of dibenzothiophene is demonstrated.

中文翻译：

---

掺氮碳纳米管的结构和表面状态对其功能和催化性能的影响

摘要

报道了对氮含量从 0 at.% 到 7.3 at.% 不等的氮掺杂碳纳米管 (N-CNT) 的综合研究。揭示了类吡啶氮的含量与 N-CNT 竹状结构的缺陷之间的相关性。提出了含有有序碳空位和吡啶氮缺陷的石墨烯层模型。该模型基于通过粉末 X 射线衍射、X 射线光电子能谱、拉曼光谱、扫描电子显微镜和使用 gC ₃ N ₄模拟 N-CNT 结构获得的实验数据的组合。结构元素。结果表明，与未掺杂的碳纳米管相比，酸性和碱性电解质中 N-CNT 的比容量增加了两倍以上，这是由于基于类似吡啶的氮中心。证明了 N-CNT 作为催化剂和钯催化剂载体在二苯并噻吩氧化脱硫反应中的效率。