Low‐cost heteroatom‐doped carbon nanomaterials have been widely studied for efficient oxygen reduction reaction and energy storage and conversion in metal‐air batteries. A Masson pine twigs‐like 3‐dimensional network construction of carbon nanofibers (CNFs) with abundant straight long Co, N, and S‐doped carbon nanotubes (CNTs) is developed by thermal treatment of Co‐based polymer coated onto polyacrylonitrile nanofiber network together with thiourea at 900 °C, denoted as CNFT‐Co₉S₈‐900. It is interesting to note that the introduction of a high concentration of sulfur does not lead to the complete toxicity of catalysts, but promotes the axial growth to selectively form straight CNTs instead of curly bamboo‐like CNTs. The highly graphitized in‐situ grown Co, N, S‐doped CNTs and the 3‐dimensional N‐doped CNF network provide both active catalytic sites and highly conductive paths, which are beneficial for oxygen reduction reaction (ORR). Thus, the optimal CNFT‐Co₉S₈‐900 performs the excellent ORR catalytic activity with a half‐wave potential of 0.84 V and a diffusion‐limited current density of 5.49 mA cm⁻². Furthermore, the CNFT‐Co₉S₈‐900‐based Zn‐air devices also possess a high power density of 136.9 mW cm⁻² better than commercial Pt/C.

中文翻译：

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硫诱导的锌空气电池碳纳米纤维网络上配位聚合物衍生的直碳纳米管的生长

低成本杂原子掺杂的碳纳米材料已被广泛研究，以在金属空气电池中进行有效的氧还原反应以及能量存储和转化。通过对涂覆在聚丙烯腈纳米纤维网络上的钴基聚合物进行热处理，开发出了碳纳米纤维（CNF）具有丰富的直长Co，N和S掺杂碳纳米管（碳纳米管）的类似于马森松树枝的三维网络结构。与硫脲在900℃下，表示为CNFT钴₉小号₈ -900。有趣的是，引入高浓度的硫并不会导致催化剂的完全毒性，而是会促进轴向生长，从而选择性地形成直的CNT，而不是卷曲的竹状CNT。高度石墨化的原位生长的Co，N，S掺杂的CNT和3维N掺杂的CNF网络提供了活性催化位点和高导电路径，这对氧还原反应（ORR）有利。因此，最佳CNFT钴₉小号₈ -900进行优异ORR 0.84 V的半波电势和5.49毫安厘米的扩散限制电流密度的催化活性^-2。此外，CNFT钴₉小号₈ -900基于-Zn类风装置还具有的136.9毫瓦cm的高功率密度^-2比商业的Pt / C更好。