Abstract A facile preparation of nitrogen doped graphene nanofibers (GNF) is required in order to promote an easy scalable method for the production of batteries using this material as catalyst support. In this work, two simple oxygen pretreatments were developed in order to maximize the nitrogen amount on the structure of the carbon nanomaterial. In that sense, a mild-term oxidation with acid and a high oxidative procedure using potassium permanganate were developed. After that, the two oxidized fibers and the raw ones were doped using a hydrothermal method which use 2-chlorethyl amine as nitrogen donor. All the materials have been deeply studied by SEM, RAMAN, FTIR, CHNS, Zeta potential, XRD, N2 adsorption-desorption and, TGA analysis. The characterization of the material showed that its structure after the treatments was more defective, significantly varying the surface area of the final material. After the hydrothermal treatment different amounts of N atoms (1.2–5.5%) were introduced in the structure depending on the oxidative treatment. The introduction of the nitrogen atoms increases the activity on oxygen reduction reaction (ORR) in almost all the cases, increasing further in the case of the GNF pretreated with acids which increase the electrochemical activity considerably.

中文翻译：

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提高 n 掺杂石墨烯纳米纤维氧还原反应电催化活性的新途径

摘要 需要一种简单的氮掺杂石墨烯纳米纤维 (GNF) 的制备方法，以促进使用这种材料作为催化剂载体生产电池的易于扩展的方法。在这项工作中，开发了两种简单的氧预处理，以最大限度地增加碳纳米材料结构上的氮含量。从这个意义上说，开发了用酸进行的温和氧化和使用高锰酸钾的高氧化程序。之后，使用2-氯乙胺作为氮供体的水热法掺杂两种氧化纤维和原始纤维。所有材料都通过SEM、RAMAN、FTIR、CHNS、Zeta电位、XRD、N2吸附-解吸和TGA分析进行了深入研究。材料的表征表明，其处理后的结构更加有缺陷，显着改变最终材料的表面积。水热处理后，根据氧化处理，在结构中引入了不同数量的 N 原子（1.2-5.5%）。在几乎所有情况下，氮原子的引入都增加了氧还原反应 (ORR) 的活性，在用酸预处理的 GNF 的情况下进一步增加，这大大增加了电化学活性。