Key Laboratory of Applied Chemistry of Hebei Province, College of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China; CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China.
CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China.
J Colloid Interface Sci. 2019 Apr 1;541:204-212. doi: 10.1016/j.jcis.2019.01.067. Epub 2019 Jan 17.
A nanostructured porous carbon (NPC) is prepared by using a facile physical activation method, with nitrogen-doped graphene nanoribbon aerogel and carbon dioxide as a precursor and an activating agent, respectively. The morphology, porosity parameters, and chemical properties of the as-prepared NPC have been revealed by using various characterization methods, including scanning electron microscopy, nitrogen sorption analysis, and X-ray photoelectron spectroscopy (XPS). The NPC with a moderate nitrogen content (5.1 atom % on the basis of XPS analysis) retains the sponge-like morphology of nitrogen-doped graphene nanoribbon aerogel, shows a high Brunauer-Emmett-Teller specific surface area (1380 m g), and possesses hierarchically porous structures. Based on its excellent properties such as high porosity, conductive network, and nitrogen-doping, NPC as a superior host is used to fabricate a sulfur-based cathode for lithium-sulfur batteries. The high specific surface area and the pore volume of NPC not only allow uniform distribution of sulfur in an amorphous form, but also help to alleviate the shuttle effect of polysulfides. As a result, the as-obtained cathode exhibits a good rate capability and cycling stability.
一种纳米结构多孔碳（NPC）是通过使用简便的物理活化方法制备的，以氮掺杂石墨烯纳米带气凝胶和二氧化碳分别作为前体和活化剂。通过各种表征方法，包括扫描电子显微镜、氮气吸附分析和 X 射线光电子能谱（XPS），揭示了所制备的 NPC 的形态、孔隙率参数和化学性质。具有中等氮含量（基于 XPS 分析为 5.1 原子%）的 NPC 保留了氮掺杂石墨烯纳米带气凝胶的海绵状形态，表现出高 Brunauer-Emmett-Teller 比表面积（1380 m²/g），并具有分级多孔结构。基于其高孔隙率、导电网络和氮掺杂等优异性能，NPC 作为一种优异的主体被用于制造用于锂硫电池的硫基正极。NPC 的高比表面积和孔体积不仅允许硫以非晶态均匀分布，而且有助于缓解多硫化物的穿梭效应。因此，所获得的正极表现出良好的倍率性能和循环稳定性。
