Abstract

Nitrogen-doped hierarchical porous hollow carbon microspheres (N-HPHCS) are synthesized using melamine-formaldehyde (MF) resin as carbon and nitrogen sources, sulfonated polystyrene microspheres (SPS) as the core template, and SiO₂ nanoparticles as the mesopore forming agent. The obtained microspheres are composed of SPS core and MF/SiO₂ composite shell (SPS@MF/SiO₂). This SPS@MF/SiO₂ is then calcined and acid-treated to obtain N-HPHCS. During the calcination, SPS core is removed, and the micropores are formed on the shell owing to the thermal decomposition of the MF resin. After chemical etching of the SiO₂ nanoparticles, mesopores are generated on the carbon shell. The as-prepared sample of N-HPHCS has high surface area and large pore volume, and exhibits catalytic activity toward oxygen reduction reaction (ORR). The electrocatalytic performance of N-HPHCS can be ascribed not only to the doped nitrogen atoms, but also to the hierarchical porous structure.

中文翻译：

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氮掺杂分层多孔空心碳微球用于电化学能转化

抽象的

以三聚氰胺-甲醛（MF）树脂为碳源和氮源，磺化聚苯乙烯微球（SPS）为核心模板，SiO ₂纳米粒子为中孔形成剂，合成了氮掺杂的分级多孔空心碳微球（N-HPHCS）。所得的微球由SPS核和MF / SiO ₂复合壳（SPS @ MF / SiO ₂）组成。然后将该SPS @ MF / SiO ₂煅烧并酸处理以获得N-HPHCS。在煅烧期间，由于MF树脂的热分解，去除了SPS核，并且在壳上形成了微孔。SiO ₂化学蚀刻后纳米颗粒，中孔在碳壳上产生。所制备的N-HPHCS样品具有高的表面积和大的孔体积，并且表现出对氧还原反应（ORR）的催化活性。N-HPHCS的电催化性能不仅可以归因于掺杂的氮原子，而且可以归因于分层的多孔结构。