Abstract In this paper, cobalt encapsulated in nitrogen and sulfur co-doped carbon nanotube (Co-NST) was synthesized through a simple pyrolysis method to impregnate platinum (Pt) nanoparticles. The Co-NST presented a bamboo-like morphology with the high degree of graphitization. Owing to the dual heteroatoms co-doped in the carbon matrix, the Pt supported on the Co-NST (Pt/Co-NST) showed the well-dispersed morphology of the Pt nanoparticles. In addition, the synergistic effect between the Co-NST support and the Pt nanoparticle was observed from the physicochemical characterizations. As a result, the Pt/Co-NST presented improved oxygen reduction reaction (ORR) activity and stability compared to the commercial Pt/C. The mass activity and specific activity of the Pt/Co-NST presented 508.48 mA mgPt−1 and 723.93 μA cmPt−2, respectively, which exhibited more than 3 times higher compared to those of the commercial Pt/C. After repeating 5000 potential cycles, the Pt/Co-NST showed improved stability with 29 mV loss in half-wave potential, while the half-wave potential of the commercial Pt/C was severely decreased by 118 mV.

中文翻译：

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钴包裹在氮和硫共掺杂的碳纳米管负载的铂中，用于氧还原反应催化剂

摘要 在本文中，通过简单的热解方法合成了包裹在氮硫共掺杂碳纳米管中的钴（Co-NST），以浸渍铂（Pt）纳米颗粒。Co-NST 呈​​现出具有高度石墨化的竹状形态。由于双杂原子共掺杂在碳基质中，负载在 Co-NST（Pt/Co-NST）上的 Pt 显示出 Pt 纳米颗粒的良好分散形态。此外，从物理化学表征中观察到 Co-NST 载体和 Pt 纳米颗粒之间的协同作用。因此，与商业 Pt/C 相比，Pt/Co-NST 表现出改善的氧还原反应 (ORR) 活性和稳定性。Pt/Co-NST 的质量活性和比活性分别为 508.48 mA mgPt-1 和 723.93 μA cmPt-2，与商业 Pt/C 相比，其表现出 3 倍以上。重复 5000 次电位循环后，Pt/Co-NST 的稳定性提高，半波电位损失 29 mV，而商用 Pt/C 的半波电位严重下降 118 mV。